GE Zenith Controls MX150 User manual

70R-2000B
5/03 Operation and Maintenance Manual
MX150 Microprocessor Controller
Transfer Switch Control Panel
GE Zenith Controls
e

Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Equipment Inspection and Storage . . . . . . . .13
Final Equipment Inspection . . . . . . . . . . . . . .13
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Engine Start Control Connections . . . . . . . . .14
Initial Energization . . . . . . . . . . . . . . . . . . .14-5
Control Connections . . . . . . . . . . . . . . . . . . . .6
MX150 Microprocessor Controller . . . . . . . . . . . .17
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
LCD & Keypad . . . . . . . . . . . . . . . . . . . . . . . .18
User Setting for Voltage & Frequency . . . . . .19
Standard Features, MSTDG Option Pkg. . . .9-10
Standard Features, MEXEG Option Pkg. . . . .11
Optional Accessories . . . . . . . . . . . . . . . . . . . .12
How to Set the System Clock . . . . . . . . . . . . .13
CDT One Event Timer Exerciser . . . . . . . .13-14
CDP Clock Exerciser . . . . . . . . . . . . . . . . . . . .15
User Setup - CFG Menu . . . . . . . . . . . . . . . . .16
User Setup - SET Menu . . . . . . . . . . . . . . . . . .17
User Setup - System Info . . . . . . . . . . . . . . . . .18
Page
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
Standard Transition . . . . . . . . . . . . . . . . . . . .119
Delayed Transition . . . . . . . . . . . . . . . . . . . . .19
Sequence of Operation . . . . . . . . . . . . . . . . . . . . .20
Standard Transition . . . . . . . . . . . . . . . . . . . .120
Delayed Transition . . . . . . . . . . . . . . . . . . . . .20
Relay/Transformer (R/T Box) . . . . . . . . . . . . . . .21
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . .123
Troubleshooting & Diagnostics . . . . . . . . . . . . . . .24
Maintenance and Testing . . . . . . . . . . . . . . . . . . . .25
Inspection and Cleaning . . . . . . . . . . . . . . . . .25
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
Table of Contents
Introduction
Authorized Service
For GE parts and service, call: [phone]
GE Zenith Transfer Switches are used to provide a continuous source of power for lighting and other critical loads by
automatically transferring from source 1 power to source 2 power in the event that source 1 voltage falls below preset limits.
Voltage sensing and system control is performed via a state-of-the-art microcontroller located on the cabinet door.
It is designed to give highly accurate control of the transfer switch system.
All GE Zenith transfer switches are designed for use on emergency or standby systems, and are rated for total system or
motor loads. Transfer switches are UL Listed under Standard 1008 and CSA Certified under Standard C22.2 No. 178 and
IEC Listed under Standard 947.
NOTES: A protective device such as a molded case circuit breaker or fused
disconnect switch MUSTbe installed on both sources of incoming
power for circuit protection and as a disconnection device.
All references made within this manual about the term “S1” or
“Source 1” relate to a Normal Power Source. All references made
about the term “S2” or “Source 2” relate to an Emergency
or Alternative Power Source.

■GE Zenith Controls 3■
MX150 Operation and Maintenance Manual (70R-2000)
Each GE Zenith transfer switch is factory wired and
tested. A complete information package is furnished
with each switch which includes:
a. Sequence of operation.
b. Description and operation of
all accessories supplied.
c. Power panel connection diagram
and schematic.
d. Description and identification of
all customer field connections.
Installation of GE Zenith transfer switches includes:
a. Mounting the transfer switch cabinet.
b. Connection of Source 1, Source 2,
and Load cables or bus bars.
c. Connection of external control
circuits as required.
Safety / Installation
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
The safe operation of your switch is GE Zenith’s focus.
The proper storage, installation, operation and mainte-
nance will help increase the life of the switch.
Equipment Inspection
and Storage
Once you have received the transfer switch, inspect
it for any damage. This includes damage to the
enclosure, power panel, control panel and wiring
harness. If any damage is found or suspected, file a claim
as soon as possible with the carrier and notify the nearest
GE Zenith representative.
Before installation, if it is necessary, store the transfer
switch in a clean dry place, protected from dirt and
water. Provide ample air circulation and heat, if neces-
sary, to prevent condensation.
5% to 95%
(non-con-
densing)
-30°C to
+75°C
(-22°F to
+167°F)
40-400 AMP
(molded shell)
-20°C to +65°C
(-4°F to +149°F)
40-4000 AMP
(all other frame
and panel types)
-20°C to +60°C
(-4°F to +140°F)
Operating
Storage Temperature
Temperature (Ambient): Humidity
CAUTION
Due to hazardous voltage and current, GE Zenith rec-
ommends that a GE Zenith Certified technician or a
qualified electrician must perform the
installation and maintenance of the switch.
WARNING
Do not use a blower since debris may
become lodged in the electrical and
mechanical components and cause damage.
Final Equipment Inspection
Prior to energizing the transfer switch:
1. Remove any debris incurred, with a vacuum, due
to shipment or installation.
2. Verify that all cabled connections are
correct and that phase rotation of both sources
match.
3. Check engine start connections.
4. Verify the correct connection of all
control wires.
5. Check settings of all timers and adjust
as necessary.
6. Adjust any optional accessories as required.
7. Check the lug torque values of the power
connections.
NOTE: Lug torque values are specified
in the power panel manual.
8. Make sure that all covers and barriers are
installed and properly fastened.
NOTE: Power panels ship from GE Zenith
in Source 1 Position.

■4GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
Installation (cont’d)
Engine Start
Control Connections
The engine-start terminals are clearly identified by a
label on the microcontroller backplate. In the case of
manual transfer switches, or in other applications not
requiring the microprocessor, clearly marked terminal
blocks are provided in the upper left corner of the con-
trol panel for the engine start control wires.
Terminals for field connections to the A3 Emergency
auxiliary contacts and the A4 Normal auxiliary contacts
are also provided. These terminals are clearly marked
and appear on the side of the power panel. On 400
amp metal frame units these terminals appear on the
bracket above the operator handle.
Initial Energization
Before proceeding, refer to the information package
supplied with the ATS and read and understand the
information on all accessories provided.
1. Unlock the enclosure.
2. Open the enclosure.
3. Verify the correct system voltage.
NOTE: The equipment rating nameplate on
the transfer switch lists the voltage.
See Figure 3 .
4. Close Source 1 circuit. breaker.
NOTE:The controller will illuminate Source 1
Available LED if proper voltage
is sensed.
5. Verify the phase to phase voltages at the Normal
line terminals.
6. Close the Emergency source circuit breaker.
7. Start the generator’s engine.
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
NOTE: The controller will illuminate Source 2
Available LED when preset voltage
and frequency levels are reached.
8. Verify the phase to phase voltages at Source 1
line terminals.
9. Verify that the phase rotation of Source 1
is the same as the phase rotation of
Source 2.
10. Shut down the generator’s engine.
11. Place the starting control in the Automatic position.
12. Complete the visual inspection of the transfer switch.
13. Close the enclosure.
14. Lock the enclosure.
CAUTIONS
Certain accessories, per specific
schematics, can inhibit automatic transfer.
Engine Gen-Set could start when
engine control wires are attached.
Figure 4
g
SERIAL NUMBER:
RATING: VOLTS -
AMPS -
SYSTEM VOLTS:
MODEL NUMBER:
HZ -
PHASE -
GE Zenith Controls
4
5
6
1
2
3
P Relay
(Engine Start)
Contact rating is
10 Ampere at 120VAC
or 28VDC Gold plated
E
Figure 3

■GE Zenith Controls 5■
MX150 Operation and Maintenance Manual (70R-2000)
Installation (cont’d)
5. Close the External (up-stream) Source 2 line
circuit breaker.
6. Start the engine generator in MANUAL mode.
NOTE: When the voltage and frequency
reach preset values, the Source 2
Available LED will illuminate.
7. Verify the phase to phase voltages
at Source 2 line terminals.
8. Verify that the phase rotation of
Source 2 is the same as the phase
rotation of Source 1.
9. Shut down the generator's engine.
(Place in Automatic Mode.)
NOTE: Source 2 Available LED
will turn off.
NOTE: The engine generator will continue
to run for the duration of Source 2
Stop Delay Timer.
10. Place the disconnect switch to ENABLE.
11. Complete the visual inspection of the
transfer switch.
12. Close the enclosure.
13. Lock the enclosure.
MX150
Figure 5 – LCD and keypad
Initial Energization (cont’d)
After all options and accessories are checked and veri-
fied, follow these steps to set up the ATS. Refer to MX150
display Figure 5. The annunciation LEDs illuminate to
indicate (1) source availability, (2) ATS position, and (3)
MX150 control function (timing).
1. Unlock the enclosure.
2. Open the enclosure.
3. Place the Disconnect Switch in the Inhibit.
NOTE: This step is only performed if the
“DS” Option was purchased.
4. Close the external (up-stream) Source 1
circuit breaker.
NOTES: Source 1 Available and Source 1
Position LED’s will illuminate.
If Source 1 Available LED does not
illuminate, verify that Source 1 Voltage
is above the preset restore value.
The Gen-Set will start and run while
Source 2 stop Delay Timer is timing.
WARNING
When performing a hi-pot or
dielectric test on the power section,
DISCONNECT the control panel plugs from
the microprocessor to avoid potential damage.
S1 OK
21:56
MON 23 APR 2002
MORE TEST

■6GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
Installation (cont’d)
A complete information package is furnished with
each transfer switch including a complete connection
diagram and schematic which details all necessary
control circuit field connections.
The engine start control wires connect to the
engine start relay terminals located to the left
of the microprocessor. Figure 2 shows the location
of these terminals.
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
To R/T Box
To Power
Panel
Input/Output
Connectors
to I/O Modules
Engine Start
Connections
Clock Program
Backup Battery
Remove protective
strip to enable clock
functions
Network Connector
Control Connections
The terminals are clearly identified by a label on the
microcontroller backplate. In the case of manual trans-
fer switches, or in other applications not requiring the
microprocessor, clearly marked terminal blocks are
provided in the upper left corner of the control panel
for the engine start control wires.
Figure 2

■GE Zenith Controls 7■
MX150 Operation and Maintenance Manual (70R-2000)
MX150 Microprocessor Controller
MX150 Controller
Consists of two major assemblies:
I. The Microprocessor contains the following:
A. MX150 Board - Customer Input and Output
(I/O) for system interface. Located on the left
hand side of the back of the unit (see figure 6)
1. I/O accessories that can be found here are:
a. Engine start relay P output
b. Pre-Signal to transfer T3, W3 and
UMD output (optional)
c. Transfer Inhibit Q3 and Q7 input
(optional)
d. Remote test Q2 input (optional)
e. Network interface ZNET
input/output (optional)
B. LCD and Keypad located on the exterior
of the door (see figure 7)
1. User accessibility to the following:
a. LED indication of source
availability
b. LED indication of transfer
switch position
c. LCD screen indicates:
(1) timer count down (numeric)
(2) event reporting (text)
d. Keypad provides user interface to:
[in conjunction with LCD screen]
(1) Setting sensors and timers
(2) Configuring logic accessories
II. The R/T box (relay transformer box) contains
the following: (see figure 6)
A. Relays which are required for controller output
to energize the transferring mechanism of the
transfer switch at line voltage.
B. Transformers which drop line voltage
to control level for controller input.
Figure 7
Figure 6
I/O Interface
R/T Box
Engine Start Relay P
Battery Strip
and
Access
Code Label
MX150
Board
MX150
S1 OK
21:56
MON 23 APR 2002
MORE TEST

■8GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
MX150 Microprocessor Controller (cont’d)
Figure 8
LCD & Keypad
These options are accessible through the LCD and
keypad (see figure below). To become familiar with the
options loaded into a particular unit, scrolling through
the SET and CFG menu will show the descriptions of
the options (see pages 16). These menus are the very
same menus that are used to access the setting and/or
configuration of these options. The SET (setting) menu
is primarily used to show or change, time and voltage
settings. The CFG menu is primarily used to turn an
option on or off. When scrolling through these menus,
MX150
S1 OK
01: 50
FRI 31 MAY 2003
Source 2 (Red)
indicates Source 2
is acceptable for use
Source 1 LED (Green)
indicates Source 1 is
acceptable for use
Exercise Event
"Impending"
SET Menu
MORE CFG TEST SET
#1 or the word
on the LCD above the key.
The word above the key
changes depending on which
screen is being displayed.
#2 or the word
on the LCD above the key.
The word above the key
changes depending on which
screen is being displayed.
#3 or the word
on the LCD above the key.
The word above the key
changes depending on which
screen is being displayed.
#4 or the word
on the LCD above the key.
The word above the key
changes depending on which
screen is being displayed.
CurrentTime,
Day and
Date of Display
Source 1 Position LED (Green)
indicates Power Panel (ATS)
is closed to Source 1 position
Source 2 Position
LED (Red) indicates
Power Panel (ATS)
is closed to
Source 2 position
MORE Menu CFG Menu TEST Menu Keypad
* E *
LCD Screen
no changes can be made without entry of the access code.
The factory set six-digit access code is located on a white
label on the back of the unit (see figure 9 pgs. 16-18).
The MX150 has many logic options. Each controller is
downloaded with options at the time of manufacture.
The collection of options that any one controller has is
specified at the time of order placement. The following
pages include all the options that can reside in the
controller. Not all units include all options.

■GE Zenith Controls 9■
MX150 Operation and Maintenance Manual (70R-2000)
User Setting for Voltage & Frequency
Standard Features, MSTDG Option Pkg.
Source 1
Voltage "Restore"
Factory Default: 90%
This adjustment determines the minimum acceptable
voltage required to transfer to Source 1.
Adjust via the SET menu. Range is 85% to 100% in
1% increments (see page 17).
Once satisfied, the T timer will begin timing
to transfer to Source 1.
Voltage "Fail"
Factory Default: 80%
This adjustment determines the low voltage threshold.
Adjust via the SET menu. Range is 75% to 98% in 1%
increments (see page 17).
"Fail" must be a minimum of 2 % below "Restore"
setting. Once voltage falls below threshold, P timer
begins timing to signal Source 2 Generator to start.
Source 2
Voltage "Restore"
Factory Default: 90%
This adjustment determines the minimum acceptable
voltage required to transfer to Source 2.
Adjust via the SET menu. Range is 85% to 100% in
1% increments (see page 17).
Once satisfied, the W timer will begin timing
to transfer to Source 2.
Voltage "Fail"
Factory Default: 80%
This adjustment determines the low voltage threshold.
Adjust via the SET menu. Range is 75% to 98% in 1%
increments (see page 17).
"Fail" must be a minimum of 2 % below "Restore"
setting. Once voltage falls below threshold, T timer
will be bypassed to expedite the transfer to Source 1.
Frequency "Restore"
Factory Default: 95%
This adjustment determines the minimum acceptable
frequency required to transfer to Source 2.
Adjust via the SET menu. Range is 90% to 100% in
1% increments (see page 17).
Once satisfied, the W timer will begin timing
to transfer to Source 2.
Frequency "Fail"
Factory Default: 90%
This adjustment determines the low frequency threshold.
Adjust via the SET menu. Range is 88% to 98% in
1% increments (see page 17).
"Fail" must be a minimum of 2 % below "Restore" setting.
Once satisfied, the W timer will begin timing to transfer
to Source 2.
6
Test Switch, Momentary
A3
Auxiliary Contact: Closed when the switch is in Source 2
position.
A4
Auxiliary Contact: Closed when the switch is in Source 1
position.
Calibrate
While monitoring the actual Phase to Phase voltage lev-
els and Frequency with a calibrated test equipment, the
Phase to Phase voltage sensing and Frequency can be
adjusted accordingly. Calibration capabilities are available
for Frequency and AB, BC, CA Phase to Phase voltage for
both Sources. Adjust via SET menu (see page 18)
CDT
Load or NO-Load. One event exerciser with adjustable
Engine exercise timer. Exercise duration can be set
between 5 and 60 minutes in 1 minute increments. Can
be configured to run every 1, 7, 14, or 28 days. Factory
Default is 20minutes. When exerciser is impending,
(*E*) appears in the upper right hand corner of LCD
screen. See page 13-14 for instructions. Configured via
CFG (see page 16). Set via SET menu (see page 17).
DS
Disconnect Switch, Auto/Inhibit.
Inhibits transfer in either direction when in inhibit.
Allows automatic operation when in Auto.
(800-4000 Amp units)
DT (DelayedTransition Only)
Time Delay from Neutral Switch position to Source 1
position. Adjustable 0-10 minutes in 1 second incre-
ments. Standard setting is 5 seconds Adjust via SET
menu (see page 17)
DW (DelayedTransition Only)
Time Delay from Neutral Switch position to Source 2
position. Adjustable 0-10 minutes in 1 second incre-
ments. Standard setting is 5 seconds.Adjust via SET
menu (see page 17)
E
Engine Start Contact

■10 GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
Std. Features, MSTDG Option Pkg. (cont’d)
EL/P
Event Log: Sequentially Numbered Log
of 16 events that track
date, time, reason and action taken
System Data: Total Life Transfers (N2P)
Days Powered Up
Total Transfers to S2
Total S1 Failures
Time S1 available in Hrs
Time S2 available in Hrs. (N1P)
K/P
Frequency Indication for S1 and S2
L
LNP Center-off position LCD-Indicator
Indicating LED lights:
L1 Indicates Switch in Source 2 position.
L2 Indicates Switch in Source 1 position.
L3 Indicates Source 1 available.
L4 Indicates Source 2 available.
P1
Time Delay Source 2 Start. Adjustable 0-10 seconds.
Standard setting is 3 seconds.
Adjust via SET menu (see page 17)
Q2
Peak Shave / Remote Load Test: Input for Peak Shave
or Remote Load Test. Includes automatic return to
Source 1 if Source 2 fails and Source 1 present.
R2E
Under voltage sensing of Source 2 for single-phase.
(R17 replaces R2E for Utility to Utility switches)
R50
In Phase Monitor this feature restricts Live to Live
Source Transfers to occur unless both Sources are within
7 electrical degrees or less of each other. (live Source to
live Source transfers usually occur during transfer back
to Source 1 or during Testing). R50 does not change
the operation of the Automatic Transfer Switch in a
power failure mode. After all timer functions have
elapsed, the CHECKING FOR SOURCE SYNCHRO-
NISM will be displayed as well as the direction of
transfer (S1-S2 for example denotes transfer from
Source 1 to Source2). When synchronism is accomplished,
transfer will take place.
Notes: - If S2 Frequency is less than S1 Frequency,
display will show a series of (- - - - -…..) symbols.
- If S2 Frequency is greater than S1 Frequency,
display will show a series of (+++++…..) symbols.
- Each (-) or (+) symbol represents 10 electrical
degrees out of phase. A maximum of 18 symbols
(180 electrical degrees) can be monitored.
- The number of (-) or (+) symbols decrease
as the two sources approach synchronism
and increase as the two sources drift out
of synchronism.
- If S1 and S2 Frequencies are identical, the
display will show a series of alternating
- - - -
symbols (++++…) which also indicate the
approximate out of phase degrees
In the event that the Sources do not come within 7
electrical degrees of each other within 60 seconds, the
unit will display the message: SYNCH CHECKING and
will allow the user to BYPASS. If the BYPASS button is
pressed, the unit will display the message: WARNING
MAY CAUSE DAMAGE TO THE LOAD. Pressing XFR
will actually bypass the R50. Since R50 is a passive device,
the length of time it takes to reach Synchronism is de-
pendent on the frequency difference between the two
Sources. Source 1 is usually a Utility and the frequency
is not within the control of the consumer. Source 2
needs to be adjusted to create an adequate difference
in order for the transfer to happen a timely fashion.
Note: For optimum performance, Source 2
Generator should be adjusted a Maximum of
2 Hertz above or below the Utility frequency,
minimum of 0.1 Hertz. (58 to 59.9) or
(60.1 to 62) Hertz. Adjustment of Generator
to 60Hertz could cause lengthy transfer delay.
R50 Feature can be turned ON or OFF via CFG Menu
(see page 16). Factory Default if OFF.
S13
Transfer Commit. Configured via CFG menu.
(see page 16) When this Feature is set to OFF:
The transfer Switch is not committed to transfer unless
the outage duration is longer than the timers that
precede the transfer to Source 2 position. This assumes
that the outage will be an isolated event. When this
Feature is set to ON: The transfer Switch is committed
to transfer to Source 2 position once the W timer has
begun timing, even if Source 1 power returns before
the transfer to Source 2. This is to ensure that the
transfer takes place, because one outage may be
followed by another.
T
Time Delay (S1) Source 1 Stable Timer. To delay trans-
fer to Source 1 (immediate retransfer on Source 2 fail-
ure). Adjustable 0-60 minutes in 1 second increments.
Standard setting is 30 minutes. Adjust via SET menu
(see page 17)
U
(S2) Source 2 Stop Delay Timer. Allows Engine to run
unloaded after switch retransfer to Source 1. Adjustable
0-60 minutes in 1 second increments. Standard setting is
5 minutes. Adjust via SET menu (see page 17)
W
Time Delay (S2) Source 2 Stable Timer. To delay trans-
fer to Source 2. Adjustable 0-5 minutes in 1 second
increments. Standard setting is 1 second. Adjust via SET
menu (see page 17)
YEN
Bypass Timers Key utilizing Keypad. When applicable,
the system prompts the user to press a button to bypass
(T) or (W) Timers should the user so desires.

■GE Zenith Controls 11 ■
MX150 Operation and Maintenance Manual (70R-2000)
In addition to the features listed under the
MSTDG Option Package, this enhanced package
includes the following features:
A3
Additional Auxiliary contact: closed when switch is in
Source 2 position.
A4
Additional Auxiliary contact: Closed when the transfer
switch is in Source 1 position.
CDP (replaces CDT)
Clock Exerciser Load/ No Load: Allows the Generator
to start and run unloaded or to simulate a power
failure, start Generator and run under load.
Can be configured by end user for 1, 7, 14,
28, 365 day cycle.
Standard Features, MEXEG Option Pkg.
VI
Voltage Imbalance (Three Phase)
For a three phase source, this feature monitors phase
voltage ratios based on a selected range within a
selected time window. Should any phase fall below the
selected lower window limit or exceed the selected
higher window limit within the selected time frame,
the controller initiates transfer to the other source.
Range: 5% to 20% of Nominal voltage,
10 to 30 seconds window, user adjustable.
Resolution: 1% Increments
Minimum Differential: 2% between “Fail”
and “Restore” settings.
Factory default: 10% “Fail”, 8% “Restore, 30 Seconds.
See CFG Menu page 16 to configure ON or OFF.
See SET Menu page 17 to set Percentage and time windows

■12 GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
6A
Test Switch, Maintained / Momentary
6AP
Test Switch, Maintained / Momentary, utilizing Keypad
A1
Auxiliary Contact, operates on Source 1 line failure.
A1E
Auxiliary Contact, operates on Source 2 line failure.
A3
Auxiliary Contacts: Closed when the transfer switch
is in Source 2 position.
A4
Auxiliary Contacts: Closed when the transfer switch
is in Source 1 position.
A62
Sequential Universal Motor Load Disconnect Circuit.
Normally closed Auxiliary contacts for Motor Loads.
Open 0-60 seconds prior to transfer, after transfer, or
both in either direction then re-close in timed sequence
after transfer.
CTAP
Alarm Panel on transfer to Source 2 with Silence button.
DS
Disconnect Switch, Auto/Inhibit.
Inhibits transfer in either direction when in inhibit.
Allows automatic operation when in Auto.
(40-600 Amp units)
HT
Heater and Thermostat.
Manual
Manual Transfer Switch transfers in either direction
by depressing designated pushbuttons.
M80
Digital Power Meter with Display: Amps, Volts, and
Frequency.
M82
Digital Meter w/Display of Amps, Watts, Volts,
Frequency, KVA, KVAR, PF, etc.
M83A
Digital Meter w/Diplay of Amps, Watts, Volts,
Frequency, KVA, KVAR, PF, etc. Plus THD capability
w/Modbus.
T3/W3
Elevator Pre-Signal Auxiliary Contacts: Open 0-60
seconds prior to transfer to either direction,
re-closes after transfer.
UMD
Universal Motor Load Disconnect Circuit: Auxiliary
Contact opens 0-60 seconds prior to transfer in either
direction, re-closes after transfer. Can be configured by
end user for Pre-transfer, Post-transfer, or both.
VI
Voltage Imbalance (Three Phase)
For a three phase source, this feature monitors phase
voltage ratios based on a selected range within a
selected time window. Should any phase fall below the
selected lower window limit or exceed the selected
higher window limit within the selected time frame,
the controller initiates transfer to the other source.
Range: 5% to 20% of Nominal voltage,
10 to 30 seconds window, user adjustable.
Resolution: 1% Increments
Minimum Differential: 2% between “Fail”
and “Restore” settings.
Factory default: 10% “Fail”, 8% “Restore, 30 Seconds.
See CFG Menu page 16 to configure ON or OFF.
See SET Menu page 17 to set Percentage and time
windows
ZNET
Network Communications Interface Card
Optional Accessories

■GE Zenith Controls 13 ■
MX150 Operation and Maintenance Manual (70R-2000)
How to Set the System Clock
How to Set the System Clock
Set System Clock, time and date
· If the clock is not set, the display will show
SET SYSTEM CLOCK on the second line
of the S1 OK screen.
· The S1 OK screen will show time (hours and
minutes) on the second line if the system clock
has been set. (Date on third line)
Setting the System Clock
(Start from S1 OK screen)
1. Remove battery protective white plastic strip
near Prelay. *
2. Press MORE then press SET.
3. Press MORE and scroll to SET SYSTEM CLOCK
using the MORE key.
4. Press SEL.
5. ENTER ACCESS CODE located on the white label
on the back of the controller.
6. Press SEL.
7. Use the up and down keys to change the hour value.
8. Press SAVE (this will enter this value and move
cursor to minutes).
9. Use the up and down keys to change the minutes.
10. Press SAVE (this will enter this value and move
cursor to month).
11. Use the up and down key up to change the month.
12. Press SAVE (This will enter this value and complete
the clock setting).
13. Use the up and down keys to change the date.
14. Press SAVE (this will enter this value and move
cursor to year).
15. Use the up and down keys to change year.
16. Press SAVE (this will enter this value and
compete the clock setting).
17. To edit settings, press SEL and repeat steps 6-16.
18. If the setting is satisfactory, press MORE
(unit then returns to the SET menu then
press BACK, then ESC.)
* Replacement battery part #K-4100
Battery will last 5 years and provides power to retain clock
function only (Controller functions without battery).
Load or No-Load
One event Exerciser with adjustable Timer. Exercise
duration can be set between 5 and 60 minutes in
1 minute increments. Can be configured to run every
1,7,14, or 28 days. Factory default is 20 minutes.
How to CONFIGURE (CFG) and Set (SET)
the Timer Exerciser
1. Beginning from the S1 OK screen,
press MORE then CFG.
2. Press MORE to scroll to CONFIG TIMER
EXERCISER screen.
3. The third line of the CONFG TIMER EXERCISER
will show either DAILY, WEEKLY, 14 DAY, 28 DAY,
or OFF.
4. If the third line of the CONFG TIMER EXERCISER
shows DAILY, WEEKLY, 14 DAY, or 28 DAY as
desired, then proceed to step 10.
5. If the third line of the CONFG TIMER EXERCISER
shows OFF or if another timer selection is desired,
continue.
6. Press SEL.
7. Enter ACCESS code located on white label
on the back of the controller.
8. Press UP or DOWN to select DAILY, WEEKLY,
14 DAY, or 28 DAY as desired.
9. Press SAVE.
10. Press MORE to scroll to CONFG TIMER
EXERCISER (XFR) or (NO XFR).
11. Press Up or Down to select XFR (Load Transfer)
or NO XFR (No Load Transfer).
12. Press SAVE.
13. Press MORE repeatedly to BACK then S1 OK screen.
Set (SET) the Exerciser:
14. Beginning from the S1 OK screen,
press MORE then SET.
15. Press MORE repeatedly until
EXER S2 RUN TIME screen.
16. Press SEL
17. Enter ACCESS code located on white label
on the back of the controller.
18. Press SEL
19. Cursor is indicated as a line under character to
be changed. Change values with up and down keys.
20. Press SAVE when complete.
21. Press MORE repeatedly until SET USER SETUP
then press BACK then ESC to the S1 OK screen.
CDT One EventTimer Exerciser

■14 GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
CDT One EventTimer Exerciser (cont’d)
How to Initiate CDT Exerciser and to start an
exercise cycle every 1, 7, 14, or 28 days
From S1 screen
1) Press TEST
2) Press MORE
3) Press START TEST TIMER (to initiate Test).
• If the CDT Exerciser is Factory configured for a
Load Exerciser, the Controller will immediately start
a load exercise. The controller will start the
generator, transfer the load to Source 2 and remain
in Source 2 for the duration set for EXER S2 RUN
TIME in the SET menu. The controller will
retransfer the load back to Source 1 after the S1
stable timer has timed out and run the generator
unloaded for the duration of the S2 stop delay timer
(Engine Cool Down Timer).
• If the CDT Exerciser is Factory configured for a
No-Load Exerciser, the Controller will immediately
start a No-load exercise. The controller will start the
generator and run it unloaded for the duration of
the S2 stop delay timer (Engine Cool Down Timer).
Exercise will be repeated at the same time as initiated
on every 1, 7, 14, or 28 days according to the selection
made in the Configure CFG menu.
How to Bypass (Cancel) an exercise during
an exercise cycle
1) Press BPASS
2) Allow the controller to complete the Engine
cool down cycle
If the CDT Exerciser is Factory configured for a
No-Load Exerciser Or allow the controller to complete
retransfer to Source 1 If the CDT Exerciser is Factory
configured for a Load Exerciser
How to Bypass the next exercise event and Keep
the rest of scheduled events unchanged
1) Press Test
2) Press MORE
3) Press BYPASS EXER
To re-institute the next exercise event back,
press CANCL BPASS
How to initiate a new exercise start time
1) Press TEST
2) Press MORE
3) Press EXER CANCL
4) Press START TIMER TEST
How to check the next exercise event
1) From S1 OK screen, press MORE three times.
2) The unit will display the PLANT EXERCISER NEXT
event in DAYS, HOURS, and MINUTES
3) Press ESC to S1 OK Screen.
Notes:
-*E* appears in the upper right hand corner
of LCD screen when exercise is impending.
- For Load Exerciser, actual exercise period
(ATS in S2 position)= CDT (Exerciser)
timing period +T (S1 stable Timer) timing period.

■GE Zenith Controls 15 ■
MX150 Operation and Maintenance Manual (70R-2000)
SET
EXERCISER
00:00
To save value and to
move cursor to next
field to be changed.
Indicates # of
Exercise Periods
BACK ^vSAVE
Indicates type of Exerciser
DAILY, WEEKLY, 14-DAY,
28-DAY or 365-DAY
Indicates Exerciser start:
Time for DAILY Exerciser
Time & Day for WEEKLY Exerciser
Time, Date & Month for 14-DAY,
28-DAY and 365-DAY Exerciser
(24 Hour System) To previous field
or to exit screen.
Up and Down
Use to change values.
Cursor
NL#1
Load No-Load (CDP)
Exercise Indicator
Exercise duration for this
event in hours and minutes
up to 10 hours per event
CDP Clock Exerciser
Load / No-Load Clock Exerciser
Allows the Generator to start and run unloaded or to
simulate a power failure, start Generator and run under
load. Can be configured by the end user for 1, 7, 14, 28,
or 365 day cycles.
• A total of 7 independent No Load exercise periods
(up to 10 hours each) can be programmed for each
of the daily, weekly, 14-day, and 28-day exercisers.
• A total of 12 independent No Load exercise periods
(up to 10 hours) can be programmed for the
365-day Exerciser.
How to Configure (CFG) the Exerciser
1. Beginning from the S1 OK screen, press MORE
then CFG.
2. Press MORE to scroll to CONFIG CLOCK
EXERCISER screen.
3. The third line of the CONFG CLOCK EXERCISER
will show either DAILY, WEEKLY, 14 DAY, 28 DAY,
365 DAY or OFF.
4. If the third line of the CONFG CLOCK EXERCISER
shows DAILY, WEEKLY, 14 DAY, 28 DAY, or 365 DAY
as desired, press MORE repeatedly to BACK.
Press ESC then proceed to the SET menu to
set the EXERCISER.
5. If the third line of the CONFG CLOCK EXERCISER
shows OFF, continue.
6. Press SEL.
7. Enter ACCESS code located on white label on
the back of the controller.
8. Press UP or DOWN to select DAILY, WEEKLY,
14 DAY, 28 DAY, or 365 DAY as desired.
9. Press SAVE.
10. Press MORE repeatedly to BACK then ESC
to S1 OK screen.
How to set (SET) the DAILY Exerciser
1. Beginning from the S1 OK screen, press MORE
then SET.
2. Press MORE repeatedly until SET EXERCISER
screen.
3. Press SEL.
4. Enter ACCESS code located on white label
on the back of the controller.
5. Press SEL
6. Cursor is indicated as a line under character to
be changed. Change values with up and down keys.
Press SAVE after each entry to save value and to
move to the next value to be changed.
7. Press BACK when complete.
8. Press MORE repeatedly until SET USER SETUP.
Press BACK then ESC to the S1 OK screen.
How to Bypass (Cancel) an exercise during
an exercise cycle
1) Press BPASS
2) Allow the controller to complete the Engine
cool down cycle.
If the CD Exerciser is configured or Set for a No-Load
Exercise. Or allow the controller to complete retransfer
to Source 1. If the CD Exerciser is configured for a
Load Exerciser
How to Bypass the next exercise event and Keep
the rest of scheduled events unchanged
1) Press TEST
2) Press MORE
3) Press BYPASS EXER
To re-institute the next exercise event back,
press CANCL BPASS
How to check the next exercise event
1) From S1 OK screen, press MORE three times.
2) The unit will display the PLANT EXERCISER NEXT
event in DAYS, HOURS, and MINUTES
3) Press ESC to S1 OK Screen.
Notes:
• In the S1 OK screen, an (*E*) appears in the upper
right hand corner of LCD screen when exercise
is impending.
• For Load Exerciser, actual exercise period
(ATS in S2 position)= CDT (Exerciser)
timing period +T (S1 Stable Timer) timing period.
• A value greater than zero must be entered in the
Exerciser duration field to be accepted as a valid
exercise period.
• The Exercise cycle will be repeated on a regular
basis as programmed and initiated in the SET menu
depending on what Exerciser was configured
(selected) in the CFG menu.

■16 GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
MX150 User Setup - CFG Menu
—TIMER EXERCISER (CDT)
1, 7, 14, 28 Day (pg. 13 - 14)
—CLOCK EXERCISER
LOAD OR NO LOAD (CDP)
1, 7, 14, 28, 365 Day (pg. 15)
—TEST KEY (6)
Maintained/Momentary (pg. 9)
—TRANSFER COMMIT (S13)
ON/OFF (pg. 10)
—IN-PHASE MONITOR (R50)
ON/OFF (pg. 10)
—PHASE IMBALANCE (VI)
ON/OFF (pg. 11)
—LOAD DISCONNECT TD (UMD)
(pg.12)
—NETWORK (ZNET)
ON/OFF (pg. 12)
CONFIG
USER SETUP
MORE BACK
1 VAB = ___ 2 VAB = ___
VBC = ___
VCA = ___
MORE CFG SET ESC
S1 OK
01: 50
FRI 31 MAY 2003
MORE TEST
Optional Accessories
Turn options ON or OFF via
keypad through the CFG menu
Enter six digit access code
(The factory assigned six-digit access code
is located on the back of the controller)
Network Communications
(Option)
11
12
13
R1
Output
5
6
7
R1
Output
14
15
16
R2
Output
8
9
10
R2
Output
Contact Rating: 10A @ 277VAC or 30VDC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PROG 1
PROG 2
GRD (Input Sink)
NIA OUT
ELEV. PRE. OUT
ALARM OUT
MOTOR DISC. OUT
INHIB. > S1
INHIB. > S2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+12V (Output Source)
LN OUT
L4 OUT
L3 OUT
L2 OUT
L1 OUT
YN IN
YE IN
TSNL IN
Q2/TSL IN
S12 IN
11
12
13
5
6
7
14
15
16
8
9
10
R1
1
2
R2
3
4
Output Contacts
Output Contacts
{
{
From J2/J4
Output
J4-3
414
13
12 11 10 9
123
567
8
J2-3 N.O. N.C.
To J2/J4 Input
Customer
Input
Voltage
{
WARNING
1Controller inputs must be relay isolated.
2Controller ouputs have limited source capability.
Use only GE Zenith - specified output modules.
MX150
Lithium Battery Exerciser Battery
Replacement - K-4100 (BR2032)
Service Life - 10 Years+
+During normal operation
User Access Code Default - 121212
Product Information www.geindustrial.com
24-Hour Service [phone]
J4*
J2*
* Input and output availability
subject to factory configuration.
Figure 9

■GE Zenith Controls 17 ■
MX150 Operation and Maintenance Manual (70R-2000)
MX150 User Setup - SET Menu
—SET SYSTEM CLOCK (pg.13)
—DAYLIGHT SAVINGS ON/OFF
—CLOCK EXERCISER (CDP)
(pg.15)
—EXER S2 RUNTIME (CDT)
(pg.13 - 14)
—S1 UNDER VOLTAGE (pg.9)
Fail
Restore
—S2 UNDER VOLTAGE (pg.9)
Fail
Restore
—S2 UNDER FREQUENCY (pg.9)
Fail
Restore
—SET % PHASE IMBALANCE (VI)
FAIL 5%, RESTORE 3% (pg.11)
—SET PHASE IMBALANCE (VI)
TIME DELAY 30 seconds (pg.11)
—TIME DELAY S2 START (P1)
(pg.10)
—TIME DELAY S2 STABLE (W)
(pg.10)
—LOAD PRESIGNAL TD (T3/W3)
(pg.12)
—LOAD DISCONNECT TD (UMD)
(pg.12)
—ATS OPEN TIME TO S2 (DW)
DELAY units only (pg.9)
—TIME DELAY S1 STABLE (T) (pg.10)
—ATS OPEN TIME TO S1 (DT)
DELAY units only (pg.9)
—S2 STOP DELAY (U) (pg.10)
—CALIBRATE S1 (pg.9)
—CALIBRATE S2 (pg.9)
SET
USER SETUP
MORE BACK
1 VAB = ___ 2 VAB = ___
VBC = ___
VCA = ___
MORE CFG SET ESC
S1 OK
01: 50
FRI 31 MAY 2003
MORE TEST
Optional Accessories
Change adjustable values
through the SET menu.
Enter six digit access code
(The factory assigned six-digit access code
is located on the back of the controller)
Figure 9
Network Communications
(Option)
11
12
13
R1
Output
5
6
7
R1
Output
14
15
16
R2
Output
8
9
10
R2
Output
Contact Rating: 10A @ 277VAC or 30VDC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PROG 1
PROG 2
GRD (Input Sink)
NIA OUT
ELEV. PRE. OUT
ALARM OUT
MOTOR DISC. OUT
INHIB. > S1
INHIB. > S2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+12V (Output Source)
LN OUT
L4 OUT
L3 OUT
L2 OUT
L1 OUT
YN IN
YE IN
TSNL IN
Q2/TSL IN
S12 IN
11
12
13
5
6
7
14
15
16
8
9
10
R1
1
2
R2
3
4
Output Contacts
Output Contacts
{
{
From J2/J4
Output
J4-3
414
13
12 11 10 9
123
567
8
J2-3 N.O. N.C.
To J2/J4 Input
Customer
Input
Voltage
{
WARNING
1Controller inputs must be relay isolated.
2Controller ouputs have limited source capability.
Use only GE Zenith - specified output modules.
MX150
Lithium Battery Exerciser Battery
Replacement - K-4100 (BR2032)
Service Life - 10 Years+
+During normal operation
User Access Code Default - 121212
Product Information www.geindustrial.com
24-Hour Service [phone]
J4*
J2*
* Input and output availability
subject to factory configuration.

■18 GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
MX150 User Setup - System Info
—PHASE TO PHASE VOLTAGE, S1 & S2
—FREQUENCY INDICATION FOR S1 & S2
(K/P) (pg.10)
—PLANT EXERCISER:
Next Impending Exerciser
(shows only if set)
—SYSTEM INFO:
Serial #: Unit Serial #
Rev #: Software Revision #
Event Log:
Sequentially Numbered Log
of 16 events that track
date, time, reason and action taken
Data: Total Life Transfers (N2P)
Days Powered Up
Total Transfers to S2
Total S1 Failures
Time S1 available in Hrs
Time S2 available in Hrs. (N1P)
—CHANGE USER ACCESS CODE
S1 OK
01: 50
FRI 31 MAY 2003
MORE TEST
View System Data
Enter six digit access code
(The factory assigned six-digit access code
is located on the back of the controller)
Figure 9
Network Communications
(Option)
11
12
13
R1
Output
5
6
7
R1
Output
14
15
16
R2
Output
8
9
10
R2
Output
Contact Rating: 10A @ 277VAC or 30VDC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PROG 1
PROG 2
GRD (Input Sink)
NIA OUT
ELEV. PRE. OUT
ALARM OUT
MOTOR DISC. OUT
INHIB. > S1
INHIB. > S2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+12V (Output Source)
LN OUT
L4 OUT
L3 OUT
L2 OUT
L1 OUT
YN IN
YE IN
TSNL IN
Q2/TSL IN
S12 IN
11
12
13
5
6
7
14
15
16
8
9
10
R1
1
2
R2
3
4
Output Contacts
Output Contacts
{
{
From J2/J4
Output
J4-3
414
13
12 11 10 9
123
567
8
J2-3 N.O. N.C.
To J2/J4 Input
Customer
Input
Voltage
{
WARNING
1Controller inputs must be relay isolated.
2Controller ouputs have limited source capability.
Use only GE Zenith - specified output modules.
MX150
Lithium Battery Exerciser Battery
Replacement - K-4100 (BR2032)
Service Life - 10 Years+
+During normal operation
User Access Code Default - 121212
Product Information www.geindustrial.com
24-Hour Service [phone]
J4*
J2*
* Input and output availability
subject to factory configuration.

■GE Zenith Controls 19 ■
MX150 Operation and Maintenance Manual (70R-2000)
Testing
NOTICE
A periodic test of the transfer switch under load conditions is recommended to insure proper operation.
(See National Electric Code articles 700 and 701)
ATSTesting
Start generator and verify proper voltage, frequency and phase
sequence (match to Source 1). Shut down gen set and place in
Auto. Complete the visual inspection of the transfer switch, and
close the cabinet door.
Initiate the test by pressing the TEST button on the LCD
keypad. The controller will then prompt for your access code.
After entering the code, three test options will appear—
XFR LOAD, FAST TEST and NO XFR (See Figure 10).
• XFR LOAD test starts the generator and using
the current timer settings, transfers the load
to Source 2.
• FAST TEST test presets timer values to a maximum
30 seconds during the test. After completion of
the test, all timers are reset to their original
values. (T3, W3, DT and DW remain)
• NO XFR test starts the generator but does not
transfer the load to the Source 2.
Press and hold the desired test option button until the switch
transfers to Source 2 (load test) or until the generator has
been run for the desired amount of time (no load test).
Releasing the test button before W timer timeout will abort
the test (Exception: when the transfer commit option, is
configured “ON”).
To test lamps, press TEST then scroll through MORE, then
press LAMP TEST. To cancel LAMP TEST press MORE.
Standard Transition
When the test is initiated, the controller initiates the Time Delay
Source 2 Start Timer (Engine Start Timer "P") cycle. A manual
CANCEL button is provided to cancel the test if desired. Upon
completion of the (P) time delay, an Engine start Signal is sent to
Source 2. When Source 2 voltage and frequency reach the preset
"Restore" Values, the time delay to Source 2 Timer (W) begins its
timing cycle to ensure voltage and frequency stabilization before
transfer. A manual pushbutton BYPASS is provided to bypass the
"W" time delay if desired. After the (W) time delay, the CCE relay
energizes the CE solenoid to close the transfer switch in to Source
2. The SE limit switch activates to de-energize the CCE relay.
Restoration of Source 1 Power:
Deactivating the test switch initiates re-transfer to Source 1
sequence.The delay to Source 1 Timer (T) begins its timing cycle
to ensure voltage and frequency stabilization before retransfer.
A manual pushbutton BYPASS is provided to bypass the "T" time
delay if desired. After the (T) time delay, the CCN relay energizes
the CN solenoid to retransfer the switch to Source 1. The SN limit
switch activates to de-energize the CCN relay.
Immediately after re-transfer, the S2 Stop Delay Timer (Delay
to Engine Stop "U") begins its cycle to allow Source 2 Engine
Figure 10
MX150
SYSTEM TEST
FAST XFR NO
MORE TEST LOAD XFR
to run unloaded. A manual pushbutton BYPASS is provided to
bypass the "U" time delay if desired. Upon completion of the
(U) timing cycle, the controller sends an Engine stop signal.
Delayed Transition
Source 1 Power Failure:
When the test is initiated, the controller initiates the Time
Delay Source 2 Start (Engine Start Timer "P") cycle. A manual
CANCEL button is provided to cancel the test if desired Upon
completion of the (P) time delay, an Engine start Signal is sent
to Source 2. When Source 2 voltage and frequency reach the
preset "Restore" values, the time delay to open Source 1 timer
(W) begins its timing cycle to ensure voltage and frequency sta-
bilization before re-transfer. A manual pushbutton BYPASS is
provided to bypass the "W" time delay if desired. After the (W)
time delay, the CCNO relay energizes the CNO solenoid to
open the transfer switch out of Source 1 position. The time
delay to Source 2 timer (DW) begins its timing cycle. After the
(DW) time delay, the CCE relay energizes. The switch then
completes transfer to Source 2 by energizing the CE solenoid.
The SE limit switch activates to de-energize the CCE relay.
Restoration of Source 1 Power:
Deactivating the test switch initiates re-transfer to Source
1sequence.The delay to open Source 2 Timer (T) begins its tim-
ing cycle to ensure voltage and frequency stabilization before
retransfer. A manual pushbutton BYPASS is provided to bypass the
"T" time delay if desired. After the (T) time delay, the CCEO relay
energizes the CEO solenoid to open the switch out of Source 2
position. The time delay to Source 1 timer (DT) begins its timing
cycle. After the (DT) time delay, the CCN relay energizes the CN
solenoid to complete re-transfer of the switch to Source 1. The SN
limit switch activates to de-energize the CCN relay.
Immediately after re-transfer, the S2 Stop Delay Timer (Delay
to Engine Stop "U") begins its cycle to allow Source 2 Engine
to run unloaded. A manual pushbutton BYPASS is provided to
bypass the "U" time delay if desired. Upon completion of the
(U) timing cycle, the controller sends an Engine stop signal.

■20 GE Zenith Controls ■
MX150 Operation and Maintenance Manual (70R-2000)
Sequence of Operation
Standard Transition
Source 1 Power Failure:
When Source 1 voltage or frequency has fallen below
the preset "Fail" values, the controller initiates the Time
Delay Source 2 Start Timer (Engine Start Timer "P")
cycle. Upon completion of the (P) time delay, an
Engine start Signal is sent to Source 2. When Source 2
voltage and frequency reach the preset "Restore" Values,
the time delay to Source 2 Timer (W) begins its timing
cycle to ensure voltage and frequency stabilization
before transfer. A manual pushbutton BYPASS is provid-
ed to bypass the "W" time delay if desired. After the (W)
time delay, the CCE relay energizes the CE solenoid to
close the transfer switch in to Source 2. The SE limit
switch activates to de-energize the CCE relay.
Restoration of Source 1 Power:
When Source 1 power reach the preset "Restore" values,
the controller initiates re-transfer to Source
1sequence.The delay to Source 1 Timer (T) begins its
timing cycle to ensure voltage and frequency stabiliza-
tion before retransfer. A manual pushbutton BYPASS is
provided to bypass the "T" time delay if desired. After
the (T) time delay, the CCN relay energizes the CN
solenoid to retransfer the switch to Source 1. The SN
limit switch activates to de-energize the CCN relay.
Immediately after re-transfer, the S2 Stop Delay Timer
(Delay to Engine Stop "U") begins its cycle to allow
Source 2 Engine to run unloaded. A manual pushbut-
ton BYPASS is provided to bypass the "U" time delay if
desired. Upon completion of the (U) timing cycle, the
controller sends an Engine stop signal.
Delayed Transition
Source 1 Power Failure:
When Source 1 voltage or frequency has fallen below
the preset "Fail" values, the controller initiates the
Time Delay Source 2 Start (Engine Start Timer "P")
cycle. Upon completion of the (P) time delay, an
Engine start Signal is sent to Source 2. When Source 2
voltage and frequency reach the preset "Restore" values,
the time delay to open Source 1 timer (W) begins its
timing cycle to ensure voltage and frequency stabiliza-
tion before re-transfer. A manual pushbutton BYPASS is
provided to bypass the "W" time delay if desired. After
the (W) time delay, the CCNO relay energizes the CNO
solenoid to open the transfer switch out of Source 1
position. The time delay to Source 2 timer (DW) begins
its timing cycle. After the (DW) time delay, the CCE
relay energizes. The switch then completes transfer to
Source 2 by energizing the CE solenoid. The SE limit
switch activates to de-energize the CCE relay.
Restoration of Source 1 Power:
When Source 1 power reach the preset "Restore" values,
the controller initiates re-transfer to Source 1
sequence.The delay to open Source 2 Timer (T) begins
its timing cycle to ensure voltage and frequency stabi-
lization before retransfer. A manual pushbutton BYPASS
is provided to bypass the "T" time delay if desired. After
the (T) time delay, the CCEO relay energizes the CEO
solenoid to open the switch out of Source 2 position.
The time delay to Source 1 timer (DT) begins its timing
cycle. After the (DT) time delay, the CCN relay ener-
gizes the CN solenoid to complete re-transfer of the
switch to Source 1. The SN limit switch activates to de-
energize the CCN relay.
Immediately after re-transfer, the S2 Stop Delay Timer
(Delay to Engine Stop "U") begins its cycle to allow
Source 2 Engine to run unloaded. A manual pushbut-
ton BYPASS is provided to bypass the "U" time delay if
desired. Upon completion of the (U) timing cycle, the
controller sends an Engine stop signal.
Timer Designations as they appear in the SET menu
ATS Type P W DW T DT U
Standard Time Delay Time Delay Time Delay S2 Stop
S2 Start S2 Stable S1 Stable Delay
Delay Time Delay Time Delay ATS Open Time Delay ATS Open S2 Stop
S2 Start S2 Stable Time to S2 S1 Stable Time to S1 Delay
Source 1 Transfer to Source 2 Source 1 Transfer to Source 1 Engine
Fails Returns Cooldown
Table 3