DynaGen AST2225 User manual

Installation and User Manual for the
AST2225-3 Automatic Transfer Switch
Full Version
File: AST2225-3rev1.6.doc
May 9, 2003
AST2225
Automatic
Transfer
Switch

Manual for AST2225 Series Automatic Transfer Switch
2
READ MANUAL BEFORE INSTALLING UNIT
Receipt of shipment and warranty return information
Upon receipt of shipment, carefully remove the unit from the shipping container and
thoroughly examine the unit for shipping damage. In case of damage, immediately
contact the carrier and request that an inspection report be filed prior to contacting the
COMPANY.
All returned items must be shipped prepaid and include a return material authorization
(RMA) number issued by the COMPANY. RMA forms are available by contacting the
COMPANY.
Limited Warranty
The COMPANY (DynaGen Technologies Inc.) warrants the product with specifications
as explained herein. The COMPANY shall repair or replace any defective materials or
workmanship, f.o.b. the Company’s factory, which prove to be defective under normal
and proper use within three year’s from the date of shipment. This constitutes the only
warranty and no other warranty shall be implied.
For questions or comments regarding this product, contact:
DynaGen Technologies Inc.
Phone [phone]
Fax: [phone]
Email: [e-mail]
WEB SITE: www.dynagensystems.com

Manual for AST2225 Series Automatic Transfer Switch
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Table of Contents
1: GENERAL DESCRIPTION: 4
1:1 Switchgear 4
1:1:1 Specification 4
1:1:2 Operation 4
1:2 Relay Control Module 5
1:2:1 Sensing 5
Adjustment Procedure 5
1:2:2 System Operation 5
2: INSTALLATION INFORMATION: 5
2:1 General 5
2:2 Recommended Upstream Protection: 6
3:REPLACINGPARTS 7
3:1 Parts List 8
3:2 Main Switch Removal and Replacement 9
3:3 Motor Removal and Replacement 9
3:4 Mechanical Limit Switch Adjustment 10
4: RECOMMENDED MAINTENANCE 11
5: DRAWINGS
5:1 Limit Switch Replacement 12
5:2 Mechanical Assembly 13
5:3 General Arrangement 14
5:4 Wiring Harness Connections 15
6: FIELD SET-UP: 16
6:1 Locking Mechanism (Enclosure) 16
6:2 Engine Exerciser 17

Manual for AST2225 Series Automatic Transfer Switch
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1: GENERAL DESCRIPTION
1:1 Switchgear:
The AST2225-3 transfer switch mechanism consists of a basic mechanical switching
assembly that can be configured to satisfy various application requirements. (UL listed
E200939 Switch Mechanism). This manual describes the AST2225-3 model. (General
Arrangement page 14).
1:1:1 Specifications for AST2225-3 model
Normal/Emergency/Neutral Lug Connections 300
MCM MA Load connections 320 MCM (Max Wire
Size)
VOLTAGE NORMAL
208/240 EMERGENCY 208/240
Amperage 225 225
Hz 60 60
Ph Three Three
Poles 3 3
Transfer Motor: 120V 60 HZ 2.3 amps thermally protected
Withstand/interrupting rating: symmetrical 10 KA. for loading at 100% of nameplate
current. Enclosure: 24” wide x 30” high x 9” deep. NEMA 4.
1:1:2 Operation:
The AST2225-3 includes the suitable sensing circuitry for automatic transfer of an
electrical load to a stand-by power supply in the event of a drop or loss of voltage of any
or all phases of the normal power supply. Upon the restoration of the normal supply, the
electrical load is automatically re-transferred to the normal power supply. The normally
required time delay functions are all included in the Timer Module package.
The transfer motor utilizes power from the source to which the electrical load is being
transferred. The mechanism provides a positive mechanical interlock to prevent both
switches from being closed at the same time. The AST2225-3 also incorporates the basic
actuating motor control switches, terminal blocks, and voltage sensing connection points
for Utility Line sensing. Provision is also made for manual transfer of the power sources
if necessary. Instructions for the manual procedure are located on the operating arm of
the mechanism. The AST2225-3 mechanism is a lever-operated device controlled by a
120 volt unidirectional gear-motor.

Manual for AST2225 Series Automatic Transfer Switch
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The transfer motor drives a crank that in turn operates an aluminum lever arm, by sliding
a nylon slider between the top and bottom parts of the arm assembly. The lever, in turn,
operates the two switch handles by means of a unique spring and roller arrangement. The
travel position of the aluminum lever is detected by two micro switches, which in turn
disconnect power to the transfer motor, when appropriate.
1:2 Relay Board Module:
The relay board provides means for automatic transfer of a utility source of power to an
emergency source of power, upon loss of the utility, and switches back again, upon
restoration of the utility. The relay board has no built in delays for transfer. Any required
delays must come from an external source (ie. engine controller, timer module).
1:2:1 Sensing:
Voltage sensing is provided by means of an adjustable 3-phase monitor. The 3-phase
monitor continuously monitors 3-phase power lines for abnormal conditions. The
adjustable voltage monitor is a single set-point voltage monitor. Input voltages 10%
below the set-point range will cause the output contacts to de-energize (unit is adjustable
from (190-240 VAC). The adjustable drop out relay recommended for use with the
AST3225-3 Automatic Transfer Switch is the Symcom 201-A
ADJUSTMENT PROCEDURE
Plug in the adjustable voltage monitor. The monitor goes through its restart delay, and the
LED on the monitor flashes red and green. After 4 seconds, the green light comes on
solid. Measure the line to line voltage. Rotate the line voltage adjustment to the nominal
line voltage feeding the transfer switch. The adjustable voltage monitor is configured to
trip when the monitor sees a voltage drop to 90% of the set point voltage.
1:2:2 System Operation:
The relay board module has provisions for 12 and 24 VDC operation. The relay board
comes factory set for 12 VDC applications. Changing from 12 to 24 VDC will require
cutting the 2 jumper wires located next to the 5-position header.
2: INSTALLATION INFORMATION
2:1 General
The basic AST2225-3 transfer switch includes all control wiring connections. The
electrical switchgear should be installed by a certified electrician, and all wiring to/from
the unit should agree with all applicable electrical codes, standards, and practices.

Manual for AST2225 Series Automatic Transfer Switch
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2:2 Recommended Upstream Protection
The AST2225-3 Transfer Switch Mechanism has been approved for use with the
following upstream protective device:
MANUFACTURER CLASSIFICATION AMPERE
RATING CATALOG NUMBER
AMP-TRAP
GOULD SHAWMUT CLASS J 300 A4J300
RECOMMENDED FUSE BLOCKS WITH BOX CONNECTORS FOR AMP-TRAP
CLASS J FUSES
CATALOG NUMBER
600 VOLTS OR LESS
FUSE
AMPERE
RATING 1 POLE 3 POLE
300 64031J 64033J

Manual for AST2225 Series Automatic Transfer Switch
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3: REPLACING PARTS
The AST2225-3 transfer switch mechanism has been designed to allow all components to
be accessible and readily removable from the front of the back panel.
CAUTION When replacing any parts of the mechanism, isolate the transfer switch from
any possible source of power.
All AST2225-3 transfer switch mechanism hardware should be tightened sufficiently
before re-energizing the switch. The following table provides suggested tightening
torques.
Screw Size Tightening Torque (in LB)
#4 5
#6 10
#8 20
#10 40
1/4” 90
3/8” 300
NOTE: For satisfactory performance, the switch terminal lugs must be securely fastened
to the terminal strips-90 (in-LB min.) Torque lugs screws to 200 (in-LB).
Replacement parts should be identified with reference to the Parts List on page 8 and the
Assembly Drawing on page 13. All parts are available direct from the factory. Be sure to
state the model and serial number of the switch. These are located on the arm label.

Manual for AST2225 Series Automatic Transfer Switch
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3:1 REPLACEMENT PARTS LIST
PARTS DESCRIPTION Ref. PARTS DESCRIPTION Ref.
No. No.
Washer #10 Flat 1 Relay Module Wire Harness 55
Bolt 3/8"-16x2" grade 5 2 Engine Exerciser Wire Harness 56
Screw 6-32x1/2" machine binding head SS 3 Engine Exerciser 58
Screw 6-32x3/8" machine pan head SS 4 Ground Strap 59
Washer 3/8" flat 13/16"OD zinc plated 5 Label Package 60
Nut 3/8"-16 hex SS 6 Relay Module 61
Screw 10-24x3" machine round head zinc plated 7 Engine Exerciser Bracket 62
Washer #6 flat SS 8 Screw 1/4" x3/4” hexagon head 63
Screw 4-40x 5/8 machine round head zinc plated Phillips 9 Relay – 12VDC or 24 VDC 64
Flat Head Screw #6-32 x 1/2" Phillips zinc plated 10 Adjustable Voltage Monitor 65
Screw 8-32x5/16" machine binding head SS 11 M-6 Metric Hexagon Nut 66
Washer #8 spring lock SS 12 # 6 x ¼” Aluminum Spacer 67
Screw 1/4"-20x1/2" set hex socket cup point SS 13 6-32 Hexagon Nut 69
Spring pin 1/8"x1 3/8" coiled 14 Washer Nylon Shoulder 72
5/16"-18 x 5/8" socket head cap screw 15 Lever Arm Angle - Upper 73
Screw 10-32x1/4" SOC HD set SS 16 Lever Arm Cover Plate 74
Washer 5/16" spring lock 17 Slider Cover 76
Washer #6 spring lock SS 18 Motor Support Bracket 77
Spacer 6-32 1 1/2" aluminum 19 Pivot Support Bracket 78
Screw 1/4"-20x1" flat head 20 Neutral Block Insulator 80
Washer 1/4" spring lock 21 Neutral Block Plate 81
Nut 1/4"-20 hex 22 Cable 82
Washer #10 spring lock zinc plated 23 Back Panel Detail 83
Screw 10-24x5/8" pan head zinc plated 24 Enclosure Detail 84
Screw 6-32x1/4" machine binding head SS 25 Lever Arm Angle - Lower 85
Switch 26 Limit Switch Spacer 86
Gear Motor 27 Limit switch cam 87
Terminal Lug 28 Aluminum Crank Block 88
Molded Case Switch 30 Squeeze Release Latch 92
Terminal Lug 31 Screw #6-32 x1" Machine Binding Head 94
10 pole terminal block 32 Nylon Spacer - #6x1/2" 95
Actuating Arm Slider 48 Label Package 96
Slider Pin 49 TSC1 Wire Harness 97
Actuating Arm Pivot Block 50 TSC1 98
Spring Detail 51 Transformer & Wire Harness 99
Inner Roller Spacer 52
Outer Roller Spacer 53
Spring Roller 54

Manual for AST2225 Series Automatic Transfer Switch
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3:2 MAIN SWITCH REMOVAL AND REPLACEMENT
To remove the main normal or emergency switches, first electrically isolate the
transfer switch from all power sources.
a) Disconnect all cables and wiring from the switch terminals.
b) Open the cover on the operating arm, remove the pin slider and close the
cover.
c) Remove the switch operating arm assembly by removing the four screws
securing the pivot bracket to the back panel and lift the arm assembly
complete with bracket from the back panel.
d) The individual switches can now be readily unfastened and removed from
the back panel.
Replacement is the reverse of the above procedure. Note when replacing
the arm assembly, ensure that the switches are set one “off” and one “on”
and that the rollers on the arm springs equally straddle the switch operating
levers. Tighten the pivot bracket screws equally to ensure controlled
deflections of the arm springs.
3:3 MOTOR REMOVAL AND REPLACEMENT
–Electrically isolate the transfer switch from all power sources.
–Note the wire connections to the 12 position connector.
–Cut the motor connection wires (white and black) approximately 3 inches
from the terminal block. Strip each wire ¾” of an inch, and attach the
corresponding leads from the new motor with wire connectors approved
for 18 gauge wire. Remove the arm assembly as previously described.
–Remove the arm assembly as previously described.
–Remove four screws securing the motor bracket to the back panel.
–Lift the assembly out of the transfer switch.
–Remove the crank and cam assembly by loosening the set screw in the cam
arm.
–Remove four screws securing the motor to the underside of the motor
bracket. The motor can now be removed.

Manual for AST2225 Series Automatic Transfer Switch
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Replacement is the reverse of the above procedure. Note that the crank arm must be
positioned flush with the end of the motor shaft and the set screw opposite the flat on the
shaft
3:4 MECHANICAL LIMIT SWITCH ADJUSTMENT
The limit switches controlling the normal and emergency positions of the main
switches, have been factory set to a clearance of 0.020” between the face of the
switch and the limit switch cam, to ensure continued reliable operation. Should it
become necessary to adjust this gap, in the event of replacing a limit switch for
example, the following procedure is recommended (see diagram page 12):
a) Electrically isolate the transfer switch from all power sources. Loosen the
pivot screw and clamp screw to enable the limit switch to rotate about the
pivot screw.
b) Open the cover on the operating arm and remove the pin slider to allow the
limit switch cam to be rotated manually.
c) Insert a 0.020” feeler gauge between the face of the limit switch cam and
the operating plunger of the switch. Rotate the limit switch about the pivot
screw to establish the 0.020” clearance. Tighten the clamp screw and pivot
screw.
d) Rotate the limit switch cam by hand to check the switch operation and
readjust if necessary
e) Replace the pin slider and close the cover.