Emerson MultiFlex CUB-II User manual

026-1705 Rev 7 06-APR-2010
MultiFlex Condensing Unit Board
(CUB-II and CUB-TD) Installation and
Operation Manual

3240 Town Point Drive NW Suite 100
Kennesaw, GA 30144, USA
Phone: [phone]
Fax: [phone]
ALL RIGHTS RESERVED
The information contained in this manual has been carefully checked and is believed
to be accurate. However, Computer Process Controls, Inc. assumes no responsibility
for any inaccuracies that may be contained herein. In no event will Computer Process
Controls, Inc. be liable for any direct, indirect, special, incidental, or consequential
damages resulting from any defect or omission in this manual, even if advised of the
possibility of such damages. In the interest of continued product development, Com-
puter Process Controls, Inc. reserves the right to make improvements to this manual,
and the products described herein, at any time without notice or obligation.

vi • Table of Contents 026-1705 Rev 7 06-APR-2010
Table of Contents
1 OVERVIEW OF THE MULTIFLEX CUB-II AND CUB-TD.................................................................................. 1
1.1. THE MULTIFLEX CUB-II.............................................................................................................................................. 1
1.2. THE MULTIFLEX CUB-TD........................................................................................................................................... 1
2 MOUNTING AND POWERING.................................................................................................................................. 2
2.1. SNAP-TRACK INSTALLATION........................................................................................................................................ 2
2.2. THE PLUG-INOUTPUT BOARD ..................................................................................................................................... 3
2.3. POWERING THE MULTIFLEX CUB BOARD ................................................................................................................... 3
2.3.1. Choosing Transformer Sizes ................................................................................................................................. 4
2.3.2. MultiFlex CUB Power Wiring............................................................................................................................... 4
2.3.2.1. New-Style MultiFlex CUB Boards (With Isolated Power Supply).................................................................................... 5
2.3.2.2. Old-Style MultiFlex CUB Boards (No Isolated Power Supply)......................................................................................... 5
2.3.3. Wire Types and Maximum Distances.................................................................................................................... 6
3 THE I/O NETWORK .................................................................................................................................................... 7
3.1. WIRING TYPES.............................................................................................................................................................. 7
3.1.1. Daisy Chains......................................................................................................................................................... 7
3.1.2. Network ID Numbers............................................................................................................................................. 7
3.1.2.1. Numbering the MultiFlex
CUB ................................................................................................................................................................................................... 8
3.1.3. Setting the Baud Rate............................................................................................................................................ 8
3.1.4. Setting the Terminating Resistance Jumpers ........................................................................................................ 8
4 CUB INPUT AND OUTPUT SETUP........................................................................................................................... 9
4.1. THE INPUTS................................................................................................................................................................... 9
4.1.1. Connecting Sensors to the MultiFlex CUB........................................................................................................... 9
4.1.1.1. Wiring ................................................................................................................................................................................. 9
4.1.1.2. Sensor Wiring Types .......................................................................................................................................................... 9
4.1.1.3. Input Type Dip Switches .................................................................................................................................................... 9
4.1.2. Power Connection............................................................................................................................................... 10
4.1.2.1. Current Ratings for On-Board Power Sources.................................................................................................................. 10
4.1.2.2. Powering Sensors Requiring 24VAC Off the Power Transformer................................................................................... 10
4.1.3. MultiFlex CUB Fixed Input Locations................................................................................................................ 10
4.2. THE OUTPUTS ............................................................................................................................................................. 11
4.2.1. Relay Output Ratings and Fuse Protection......................................................................................................... 12
4.2.2. Wiring Outputs to Points..................................................................................................................................... 12
4.2.3. MultiFlex CUB Fixed Outputs ............................................................................................................................ 12
5 BOARD STATUS LEDS ............................................................................................................................................. 13
5.1. STATUS LED............................................................................................................................................................... 13
5.2. TXAND RXLEDS....................................................................................................................................................... 13
5.3. CODE A AND CODE B LEDS...................................................................................................................................... 13
5.4. RELAY OUTPUT LEDS................................................................................................................................................ 14
6 MULTIFLEX CUB-II AND CUB-TD SOFTWARE OVERVIEW........................................................................ 15
6.1. COMPRESSOR CONTROL.............................................................................................................................................. 15
6.1.1. Suction Pressure Compressor Control................................................................................................................ 15
6.1.2. Case Temperature Compressor Control............................................................................................................. 15
6.1.2.1. Pump Down ...................................................................................................................................................................... 15
6.1.2.2. Fallback Pressure Setpoints .............................................................................................................................................. 15

MultiFlex CUB-II and CUB-TD I&O Guide Table of Contents • vii
6.2. CONDENSER FAN CONTROL ....................................................................................................................................... 16
6.2.1. Temperature Differential (TD) Strategy ............................................................................................................. 16
6.2.1.1. TD Control Fail-Safes....................................................................................................................................................... 16
6.2.2. Pressure Control Strategy................................................................................................................................... 16
6.2.3. Case Temperature Control.................................................................................................................................. 17
6.3. DEFROST CONTROL .................................................................................................................................................... 17
6.3.1. Defrost Termination............................................................................................................................................ 17
6.4. SENSOR CONTROL ...................................................................................................................................................... 17
6.4.1. How Cut In/Cut Out Control Works ................................................................................................................... 17
6.4.2. Motor Room Temperature Control..................................................................................................................... 18
6.4.2.1. Exhaust Fan Control ......................................................................................................................................................... 18
6.4.2.2. Example of a Motor Room Zone Temperature Configuration ......................................................................................... 18
6.5. ALARM CONDITIONS (SAFETY MODES) ..................................................................................................................... 19
6.5.1. High Discharge Trip Safety Mode...................................................................................................................... 19
6.5.2. Compressor Proof Fail Safety Mode .................................................................................................................. 19
6.5.3. Compressor Oil Failure Safety Mode................................................................................................................. 20
6.5.4. Phase Fail Mode................................................................................................................................................. 20
6.6. DOOR SWITCHES AND CLEAN (WASH) SWITCHES ..................................................................................................... 20
6.6.1. Door Switches..................................................................................................................................................... 20
6.6.2. Clean (Wash) Switches........................................................................................................................................ 21
7 THE MULTIFLEX CUB E2/ EINSTEIN INTERFACE......................................................................................... 22
7.1. ADDING/DELETING ACUB ........................................................................................................................................ 22
7.1.1. Adding a CUB..................................................................................................................................................... 22
7.1.2. Deleting a CUB................................................................................................................................................... 23
7.2. VIEWING THE CUB STATUS SCREEN ......................................................................................................................... 23
7.2.1. Inputs and Setpoints............................................................................................................................................ 24
7.2.2. Sensor Control .................................................................................................................................................... 25
7.2.3. Outputs and Operational States.......................................................................................................................... 25
7.2.4. Defrost................................................................................................................................................................. 26
7.2.5. KW Usage ........................................................................................................................................................... 26
7.3. PROGRAMMING THE CUB USING THE E2 OR EINSTEIN FRONT PANEL..................................................................... 26
7.3.1. Screen 1: General ............................................................................................................................................... 27
7.3.2. Screen 2: Setpoints.............................................................................................................................................. 28
7.3.2.1. Temperature Differential (TD) ......................................................................................................................................... 30
7.3.2.2. Traditional Strategy .......................................................................................................................................................... 30
7.3.3. Screen 3: Inputs .................................................................................................................................................. 31
7.3.4. Screen 4: Aux Inputs........................................................................................................................................... 32
7.3.5. Screen 5: CUB Inputs ......................................................................................................................................... 32
7.3.6. Screen 6: Defrost ................................................................................................................................................ 34
7.3.7. Screen 7: Outputs................................................................................................................................................ 35
7.3.8. Screen 8: CUB Outputs....................................................................................................................................... 37
7.3.9. Screen 9: Sensor Control.................................................................................................................................... 38
7.3.10. Screen 10: Alarms............................................................................................................................................. 39
7.3.10.1. Oil Failure Alarm Setpoints............................................................................................................................................ 39
7.3.10.2. Discharge Pressure Alarm .............................................................................................................................................. 40
7.3.10.3. High/Low Suction Pressure Alarms ............................................................................................................................... 41
7.3.10.4. Compressor Proof Alarms .............................................................................................................................................. 41
7.3.10.5. Phase Fail Shutdown....................................................................................................................................................... 42
7.3.10.6. Door Switch Alarms ....................................................................................................................................................... 42
7.3.10.7. Wash Active Alarms....................................................................................................................................................... 42
7.3.10.8. Case Temperature Alarms .............................................................................................................................................. 42
7.3.10.9. Suction Temperature Alarms.......................................................................................................................................... 43
7.3.10.10. TD Condenser Control Alarms..................................................................................................................................... 43

viii • Table of Contents 026-1705 Rev 7 06-APR-2010
8 THE MULTIFLEX CUB HAND-HELD INTERFACE........................................................................................... 44
8.1. CUB HAND-HELD TERMINAL STATUS SCREENS ....................................................................................................... 44
8.1.1. Pressure Status.................................................................................................................................................... 44
8.1.2. Case Temp Status................................................................................................................................................ 44
8.1.3. Other Temperatures ............................................................................................................................................ 44
8.1.4. Input Summary Screen ........................................................................................................................................ 45
8.1.5. Outputs Summary Screen #1............................................................................................................................... 45
8.1.6. Outputs Summary Screen #2............................................................................................................................... 45
8.1.7. System Status....................................................................................................................................................... 45
8.1.8. Refrigeration Control Status............................................................................................................................... 45
8.2. ALTERING CUB CONFIGURATION USING THE HAND-HELD TERMINAL.................................................................... 45
8.2.1. The Main Configuration Menu............................................................................................................................ 45
8.2.2. Navigation........................................................................................................................................................... 46
8.2.3. General Hand-Held Terminal Screens................................................................................................................ 46
8.2.3.1. Circuit Name..................................................................................................................................................................... 46
8.2.3.2. Refrigerant Select.............................................................................................................................................................. 47
8.2.3.3. Phase................................................................................................................................................................................. 47
8.2.3.4. Temp EU........................................................................................................................................................................... 47
8.2.3.5. Time and Date................................................................................................................................................................... 48
8.2.3.6. Daylight Savings Time ..................................................................................................................................................... 48
8.2.4. Setpoints Screens................................................................................................................................................. 48
8.2.4.1. Condenser Setpoints ......................................................................................................................................................... 49
8.2.4.2. TD Strat Info..................................................................................................................................................................... 49
8.2.4.3. TD Max............................................................................................................................................................................. 49
8.2.4.4. Comb Method ................................................................................................................................................................... 49
8.2.4.5. Min OFF/ON Times.......................................................................................................................................................... 50
8.2.4.6. Condenser SPs .................................................................................................................................................................. 51
8.2.4.7. Condenser Fan 1 Setpoints ............................................................................................................................................... 51
8.2.4.8. Condenser Fan 2 Setpoints ............................................................................................................................................... 51
8.2.5. Alarm Setpoints Screens...................................................................................................................................... 52
8.2.5.1. Case Hi and Lo Temp....................................................................................................................................................... 52
8.2.5.2. Phase Fail.......................................................................................................................................................................... 52
8.2.5.3. Shut Down On Proof......................................................................................................................................................... 52
8.2.5.4. Proof Failure ..................................................................................................................................................................... 53
8.2.5.5. Oil Restart Delay .............................................................................................................................................................. 53
8.2.5.6. Digital Oil Failure............................................................................................................................................................. 53
8.2.5.7. High Discharge Alarm...................................................................................................................................................... 54
8.2.5.8. High Discharge Auto Resets............................................................................................................................................. 54
8.2.5.9. Door Switch...................................................................................................................................................................... 54
8.2.5.10. Wash Switch ................................................................................................................................................................... 54
8.2.6. Defrost Setup Screens.......................................................................................................................................... 55
8.2.6.1. Defrost Type ..................................................................................................................................................................... 55
8.2.6.2. Fan Control ....................................................................................................................................................................... 55
8.2.6.3. Defrost Times ................................................................................................................................................................... 56
8.2.6.4. Defrost Schedule Screens 1 and 2..................................................................................................................................... 56
8.2.7. Input Setup Screens............................................................................................................................................. 56
8.2.7.1. Input Setup ....................................................................................................................................................................... 56
8.2.8. Outputs Screens................................................................................................................................................... 58
8.2.9. Auxiliary Inputs Screens...................................................................................................................................... 58
8.2.9.1. Pulse KW Setup ............................................................................................................................................................... 58
8.2.9.2. Analog KW Setup ............................................................................................................................................................ 58
8.2.9.3. Linear 1 and 2 Setup......................................................................................................................................................... 58
8.2.10. Sensor Control Screens..................................................................................................................................... 59
8.2.10.1. Sensor Screen 1 (Name, Type) ...................................................................................................................................... 59
8.2.10.2. Sensor Screen 2 (Cut In/Out, Min ON/OFF).................................................................................................................. 59
8.2.10.3. Sensor Screen 3 (Hi/Lo Alarm) ...................................................................................................................................... 60

MultiFlex CUB-II and CUB-TD I&O Guide Table of Contents • ix
8.2.10.4. Sensor Control Screen 4 (Alarm Priority, Comb Method)............................................................................................. 60
APPENDIX A: TD QUICK START ............................................................................................................................... 62
APPENDIX B: CASE TYPE DEFAULTS ..................................................................................................................... 68

The MultiFlex CUB-II Overview of the MultiFlex CUB-II and CUB-TD • 1
1 Overview of the Multi-
Flex CUB-II and CUB-TD
The MultiFlex CUB-II and CUB-TD boards
are “smart” input/output boards designed to con-
trol single condensing units. A single condens-
ing unit is a self-contained compressor and
condenser bearing unit which controls refrigera-
tion in a single case line-up or walk-in cooler.
The MultiFlex CUB-II controllers are capable of
commanding compressors, condensers, refriger-
ation, and defrost for a single condensing unit
using on-board I/O and control algorithms. The
CUB-TD controller is a more limited board that
controls only condensers, using a temperature
differential control strategy.
The MultiFlex’s I/O Points
The compact size of the MultiFlex allows
technicians to easily field-mount the MultiFlex
CUB-II and CUB-TD in a panel or enclosure
close to the single condensing unit, allowing for
easy local connection of sensors and transducers.
The board has 16 analog inputs (for connection
to vital input sources, such as suction pressure
transducers and case temperature sensors) and
eight relay outputs, rated 2.0 amps max, for acti-
vating and deactivating compressors, defrost,
and condenser fans.
Independent System Control
The MultiFlex CUB-II and CUB-TD con-
trollers are equipped with software and an
enhanced processor, which gives them the capa-
bility of controlling independently without the
need of a central controller (such as CPC’s E2 or
Einstein RX Refrigeration Controller). However,
the CUB-II and CUB-TD are designed to inter-
face with an E2 or Einstein for purposes of dis-
playing status on status screens, reporting
alarms, and recording logs. The CUB-II and
CUB-TD may be configured either with a CPC
Hand-Held Terminal (HHT) or through the E2 or
Einstein front panel.
1.1. The MultiFlex CUB-II
The MultiFlex CUB-II controllers are capa-
ble of handling all aspects of single condensing
unit control, including compressors, condensers,
refrigeration, and defrost, using on-board I/O
and control algorithms. The CUB-II is capable
of controlling one single-stage compressor,
refrigeration and scheduled/terminated defrost in
a case circuit with up to six temperature inputs,
and condenser control using either a control by
pressure strategy (activates up to two fans to
maintain a set discharge pressure) or temperature
differential strategy (activates up to four fans to
maintain a set difference between the ambient
temperature and the drop leg refrigerant temper-
ature).
1.2. The MultiFlex CUB-TD
The MultiFlex CUB-TD is a “stripped” ver-
sion of the MultiFlex CUB-II that includes only
an algorithm for temperature differential (TD)
condenser fan control. Up to four condensing
unit fans are cycled on and off as required to
meet compressor unit heat of rejection load. The
TD algorithm subtracts plenum air temperature
from the drop leg temperature and uses the dif-
ference between the two temperatures as a con-
trol value. If the difference is higher than the
setpoint, the fans are staged on. If the difference
is lower than the setpoint, the fans are staged off.
The temperature differential control capabili-
ties of the CUB-TD are identical to those of a
CUB-II operating in temperature differential
mode, except the CUB-TD controls condensers
only. The CUB-TD only has inputs for reading
temperatures and outputs for controlling up to
four fans. For control of any other single con-
densing unit subsystem, a CUB-II will neces-
sary.

2 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 7 06-APR-2010
2 Mounting and Power-
ing
The MultiFlex boards are usually mounted
by the refrigeration equipment manufacturer.
Therefore, the installer need only make the nec-
essary connections between the boards and the
site controller(s).
In some instances, an installer may be
required to mount an I/O board. There are no
restrictions on the location of these boards; how-
ever, for ease of network configuration, it is rec-
ommended that the boards be located adjacent to
the E2 or Einstein. I/O boards may be mounted
without an enclosure, but they should be
mounted in a location that is not easily accessi-
ble to avoid tampering or damage.
2.1. Snap-Track Installation
MultiFlex boards not supplied in a custom
panel or other enclosure are supplied with a
snap-track for easy installation. The insulation
sheet and I/O board must be removed from the
track before the track is mounted. The snap-track
is mounted using the 0.1875” mounting slots.
Figure 2-1 shows this installation procedure.
Figure 2-2 provides mounting dimensions
for the MultiFlex board.
Figure 2-1 - MultiFlex Snap-Track Mounting
Figure 2-2 - MultiFlex Board Dimensions

The Plug-In Output Board Mounting and Powering • 3
2.2. The Plug-In Output Board
The MultiFlex CUB has an output sub-board
that plugs to the top of the baseboard. Typically,
these boards are shipped with the output board
pre-installed on the board using stand-offs, so no
additional hardware setup should be necessary.
The additional board makes the MultiFlex
CUB boards considerably taller than the Multi-
Flex 16 and other CPC I/O boards. If you will be
mounting these boards in an enclosure, the board
will need at least 2.5” of clearance between the
baseboard and the panel door.
2.3. Powering the MultiFlex
CUB Board
CPC supplies a wide variety of 24VAC trans-
formers with varying sizes and either with or
without center taps. Table 2-1 shows the trans-
former sizes and whether they are center-tapped
or non-center-tapped.
Figure 2-3 - Exploded View — MultiFlex CUB-II
WARNING: All models of MultiFlex require a
24VAC Class 2 input power source. The Multi-
Flex CUB-II requires the power source to be
non-center-tapped. Refer to Section 2.3.1.,
Choosing Transformer Sizes for center tap usage.
Xformer P/N VA Rating Primary Voltage Center Tap?
640-0041 50 VA 110 VAC No
640-0042 50 VA 220 VAC No
640-0056 56 VA Multi-tap (120/208/240 VAC) Yes
640-0050 75 VA 110 VAC No
640-0045 75 VA 220 VAC No
640-0080 80 VA Multi-tap (120/208/240 VAC) Yes
Table 2-1 - Transformers Compatible with Datalink Module

4 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 7 06-APR-2010
2.3.1. Choosing Transformer Sizes
In most site installations, a single trans-
former will power multiple devices. Choose a
transformer with a VA rating large enough to
power all devices that will be attached to it.
Table 2-2 gives the VA ratings of the MultiFlex
CUB in conjunction with other MultiFlex
boards. Refer to your site controller’s manual for
VA ratings of the other I/O boards that may be
powered by one of these transformers.
2.3.2. MultiFlex CUB Power Wiring
The MultiFlex CUB boards do not use a cen-
ter tap. Instead, the 0V terminal on the board
should be connected to a separate earth ground.
Important! The rules that must be fol-
lowed when connecting a MultiFlex CUB
board to a transformer are different depend-
ing on whether you have a "new style" Multi-
Flex board with an isolated power supply (all
MultiFlex boards shipped after November 1,
2002) or an "old style" MultiFlex board (all
MultiFlex boards shipped before November
1, 2002).
A new-style MultiFlex board has a green
power LED located next to the 24VAC connec-
tion terminal in the upper right corner of the cir-
cuit board (see Figure 2-4 for reference).
If there is a green power LED next to the
connector, your MultiFlex is a new-style Multi-
Flex -- refer to Section 2.3.2.1., New-Style Mul-
tiFlex CUB Boards (With Isolated Power
Supply) for power wiring instructions.
If there is no green power LED next to the
connector, your MultiFlex is an old-style Multi-
Flex -- refer to Section 2.3.2.2., Old-Style Multi-
Flex CUB Boards (No Isolated Power Supply)
for power wiring instructions.
Unit VA VAC Center-
Tapped?
MultiFlex 16 624Yes
MultiFlex 88,
88AO, 168,
and 168AO
15 24 NO
MultiFlex RTU 15 24 NO
MultiFlex CUB 15 24 NO
Table 2-2 - Device Power Requirements
Figure 2-4 - New-Style vs. Old-Style MultiFlex Board
POWER LED
New Style
MultiFlex Board
(Top Left Corner)
NO POWER LED
Old Style
MultiFlex Board
(Top Left Corner)
24 VAC
24 VAC

Powering the MultiFlex CUB Board Mounting and Powering • 5
2.3.2.1. New-Style MultiFlex CUB Boards
(With Isolated Power Supply)
The new-style MultiFlex board can be con-
nected to any of the center-tapped transformers
mentioned in Table 2-2, provided the 0V termi-
nal of the board is connected to an earth ground.
A center-tapped transformer may power
both center-tapped and non-center-tapped
devices at the same time, as long as none of the
non-center-tapped MultiFlex boards are old-
style MultiFlex boards. If an old-style Multi-
Flex shares the same center-tapped transformer
as a device that uses the center tap, the old-style
MultiFlex will be damaged. Figure 2-5 shows
how to wire a non-center-tapped device to a cen-
ter-tapped transformer.
In addition, the MultiFlex CUB boards can
be powered by one of the 50VA or 75VA non-
center-tapped transformers listed in Table 2-1 on
page 3. Figure 2-6 shows how to wire the trans-
formers to the MultiFlex boards.
2.3.2.2. Old-Style MultiFlex CUB Boards
(No Isolated Power Supply)
Like the new-style MultiFlex board, the old-
style MultiFlex board can be connected to any of
the center-tapped transformers mentioned in
Table 2-2, provided you observe the following
three rules:
Rule 1: Ground the 0V terminal on the old-
style MultiFlex board to an earth ground.
Do not connect the center tap of the trans-
former to the 0V terminal.
Rule 2: Do not power an old-style MultiFlex
non-center-tapped board with a transformer
that is also powering a center-tapped device.
This means you cannot connect an old-style
MultiFlex non-center-tapped board to a trans-
former that is powering a MultiFlex 16, 16AI,
8RO, 4AO, 8DO, or any previous generation
CPC board that uses center-tapped power. Doing
so will destroy the MultiFlex board.
Rule 3: The secondary of the transformer
must not be grounded on any side.
NOTE: 14AWG or larger should be used for
earth ground and the length should be kept
short. Less than six inches is preferred.
Figure 2-5 - Wiring Non-Center-Tapped MultiFlex Boards to
Transformers With a Center Tap
Earth ground.
Use 14 AWG or
larger.
Keep as short
as possible.
Less
than six inches
is preferred.
Figure 2-6 - Non-Center-Tapped Transformer Wiring

6 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 7 06-APR-2010
Verify that neither side of the transformer
secondary is connected to earth ground before
powering the old-style MultiFlex board. A
grounded secondary will damage the MultiFlex
board.
In addition, the old-style MultiFlex CUB
boards can be powered by one of the 50VA or
75VA non-center-tapped transformers listed in
Table 2-1 on page 3. Figure 2-6 shows how to
wire the transformers to the MultiFlex boards.
2.3.3. Wire Types and Maximum Dis-
tances
For powering I/O boards, use only the listed
wire types from Table 2-3. Three-conductor non-
shielded cables are the recommended wire for
connecting between the center-tapped trans-
former and the I/O boards. Shielded cable should
not be used for power wiring. The center tap
should be wired with the third conductor to earth
ground at the controller. (Use 14AWG and keep
the length of wire short. Less than six inches is
preferred).
The wire length from the transformer and the
number of boards connected to the same wire
determines the type wire gauge used. In most
cases, the distance between the I/O boards and
the transformer that supplies power to them is
not enough to be concerned with. But it is very
important not exceed this maximum wire length
or the boards will malfunction.
Use these formulas to determine if the wire
gauge you are using fits within specification:
Sensors requiring 24VAC can be powered
from the same transformer powering the input
board as long as the resulting total load of both
the input board(s) and the sensor(s) connected to
the transformer does not exceed the trans-
former’s VA rating, and the sensors have an iso-
lated power supply. If the sensors do not have an
isolated power supply, they could be damaged if
connected with center-tapped or grounded sec-
ondary transformers.
Power Wiring Types
14 AWG Belden 9495
18 AWG Belden 9493
Table 2-3 - Power Wiring Types
14 AWG:
Feet = 1920/VA
18 AWG:
Feet = 739/VA
(VA is the total VA rating of the I/O boards)
For example, if you had an 80 VA load:
14 AWG: 24 ft
18 AWG: 9 ft (rounded down)
Figure 2-7 - Power Wire Lengths

Wiring Types The I/O Network • 7
3TheI/ONetwork
Although the MultiFlex CUB can operate as
a stand-alone controller, it relies on an E2, Ein-
stein, or REFLECS unit for advanced features
such as remote dial-in/dial-out, logging, and
alarm control. All MultiFlex boards and control-
lers use an RS485 Network connection to com-
municate with an E2, Einstein, and REFLECS
site controllers. Technicians who are familiar
with CPC’s previous generation 16AI, 8IO, and
ARTC boards will find the network setup proce-
dure for the MultiFlex CUB boards to be very
much the same.
3.1. Wiring Types
CPC specs Belden #8761 shielded twisted
pair cables for use as I/O Network wiring (or
Belden #82761 and Belden #88761 for plenum
installations).
If the recommended cable is not available in
your area, be sure the wiring meets or exceeds
the following specs:
3.1.1. Daisy Chains
The RS485 Input/Output (I/O) Network con-
nects all input and output communication boards
together in a single open communications loop.
This loop, or “daisy chain,” connects the E2,
Einstein, or REFLECS to multiple input and out-
put communication boards, and terminates at the
last input or output board on the network. A dia-
gram of this network arrangement is shown in
Figure 3-1.
3.1.2. Network ID Numbers
Each device on an RS485 segment has a net-
work dip switch that must be used to assign the
board a unique network ID number.
The network ID number makes a board
unique from other boards on the network of the
same type. This allows the site controller to find
it and communicate with it easily.
Boards of the same type should be numbered
in sequence, starting with one and continuing
with two, three, and so forth.
Shielded? Yes
Conductor Type Twisted Pair
Gauge 18 - 24 AWG
Capacitance between
signal wires 31 pF/ft or less
Capacitance between
signal and shield 59 pF/ft or less
Nominal Impedance 12050
Table 3-1 - RS485 I/O Network Wiring Specifications
Figure 3-1 - I/O Network Configurations

8 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 7 06-APR-2010
3.1.2.1. Numbering the MultiFlex
CUB
The MultiFlex CUB is a unique board type
on the RS485 Network by the CPC controllers.
Each CUB that will be associated with an E2 or
Einstein must have a unique number from
1 to 31, which is configured by setting the first
five switches on dip switch bank S3.
3.1.3. Setting the Baud Rate
All I/O boards have dip switches that deter-
mine the baud rate at which they communicate.
Currently, the baud rate dip switch in network
components may be set at either 9600 or 19200
baud. Either may be used — refer to your site
controller’s user manual for the baud rate recom-
mendation (currently 9600 baud for REFLECS,
E2, and Einstein controllers).
On all MultiFlex boards, switches 6 and 7 on
S3 are used to set the baud rate. To communicate
at 9600 baud, set switch #6 UP and #7 DOWN.
For 19200 baud, set switch #6 DOWN and #7
UP. Refer to Figure 3-2 for a visual look at how
the switches must be set.
3.1.4. Setting the Terminating Resis-
tance Jumpers
All MultiFlex boards and other RS485
devices have a set of terminating resistance
jumpers (one jumper for each wire lead). These
jumpers are labeled JP2, JP3, and JP4 on the
MultiFlex board.
The purpose of the jumpers is to indicate the
two ends, or termination points, of the segment.
On a daisy chain, one device at the beginning
and one device on the end must be terminated by
placing all three termination jumpers in the OUT
(toward the left edge of the board) position. All
other devices on the daisy chain must be set to
the IN (toward the center of the board) position.
Figure 3-3 shows the proper terminating resis-
tance jumper settings for the E2, Einstein, and
for all I/O boards.
Figure 3-2 - CUB-II Baud Rate Switches
Figure 3-3 - I/O Network Termination Jumper Settings

The Inputs CUB Input and Output Setup • 9
4 CUB Input and Output
Setup
4.1. The Inputs
4.1.1. Connecting Sensors to the
MultiFlex CUB
Wiring an input to the input points on a Mul-
tiFlex board requires three steps:
1. Connect the sensor’s signal wires to the two
terminals of an input point.
2. Set the input type dip switch that corre-
sponds to the point being connected.
3. If necessary, connect the sensor to one of the
5V or 12V power terminals.
4.1.1.1. Wiring
An input point on a MultiFlex board consists
of two terminals, as shown in Figure 4-1. One of
these terminals, labeled SIG, reads the signal
from the sensor, while the other, labeled 0v is
where the sensor’s ground and/or cable shield
wire is connected.
4.1.1.2. Sensor Wiring Types
Specific wiring types are required for each
type of sensor used with E2, Einstein, or RMCC.
All Analog Temperature Sensors and Air Flow Sen-
sorsTemperature and air flow sensors are to be
wired with shielded, 2 conductor, at least 22 GA
wire (Belden # 8761 or equivalent).
All Pressure Transducers, Humidity Sensors, and Re-
frigeration Transducers
Pressure and refrigeration transducers and
humidity sensors are to be wired with shielded, 3
conductor, at least 22 GA wire (Belden #8771 or
equivalent).
Dewpoint and Light Level Sensors
These sensors are to be wired with shielded,
4 conductor at least 22 GA wire (Belden # 8729
or equivalent).
4.1.1.3. Input Type Dip Switches
Each MultiFlex input point has an input type
dip switch that must be set. Input type dip
switches are located in the switch banks labeled
S1 and S2.
The input type dip switch tells the input
board whether or not the sensor connected to the
point is a resistive type sensor. Generally, if the
sensor or transducer supplies its own voltage
signal to the point, the dip switch should be set
to the LEFT position. If the sensor uses variable
resistance and requires voltage to be supplied to
it from the input point, set the dip switch to the
RIGHT position. Dip switches for unused points
should be set to the RIGHT position.
Figure 4-1 - Input Board Points Figure 4-2 - Input Type Dip Switches for CUB Board

10 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 7 06-APR-2010
4.1.2. Power Connection
If power is needed to operate the sensor, four
points are provided on the MultiFlex board that
supply DC power: one +12VDC point, and three
+5VDC points. See Figure 4-3 for the location
of these points.
To connect to one of the DC power sources,
simply connect the sensor’s power wire to one of
the terminals.
A sensor that requires 24VAC can be pow-
ered off the MultiFlex’s own 24VAC power con-
nection. To connect to the 24VAC power source,
connect the sensor’s power wires to terminals
AC1 and AC2.
4.1.2.1. Current Ratings for On-Board
Power Sources
The maximum current that may be drawn
from the +12VDC terminal is 100 milliamps.
The maximum current that can be drawn from
all three +5VDC terminals COMBINED is 50
milliamps.
4.1.2.2. Powering Sensors Requiring
24VAC Off the Power Transform-
er
Some sensors that requires 24VAC can be
powered off the MultiFlex’s own 24VAC power
connection. To connect to the 24VAC power
source, connect the sensor’s power wires to ter-
minals AC1 and AC2.
This can only be done with sensors that keep
the 24VAC signal isolated from its DC output
signal (such as CPC’s Dewpoint Probe). If the
output signal is not isolated from the 24VAC
input, you must use a separate transformer.
4.1.3. MultiFlex CUB Fixed Input Lo-
cations
The MultiFlex CUB supports a large number
of different types of input sources that might be
found on a single condensing unit’s pressure
control, condenser control, or refrigeration con-
trol systems. Because input locations are speci-
fied by the user in the system software, you can
connect inputs from the condensing unit to any
point on the CUB. However, to make setup eas-
ier, the CUB has assigned default sensor loca-
tions to a few of the inputs on the board.
Table 4-1 lists the inputs with assigned
defaults. If you choose to not use the defaults
listed, you may change any or all of them in the
system software (see Section 7.3.3., Screen 3:
Inputs and Section 8.2.7., Input Setup Screens).
Figure 4-3 - Input Board Power Sources
CUB Input
Point
Number Label Sensor to Connect
To This Point
1 Suction
Transducer 0-100PSI Pressure Transducer, measuring
suction pressure
2 Discharge
Transducer 0-500PSI Pressure Transducer, measuring
discharge pressure
3 Oil Trans-
ducer 0-200PSI Pressure Transducer, for measur-
ing oil pressure
4 Case 1
Temp Discharge air tempera- ture sensor for the
cooler or case lineup
16 Alarm
Reset Digital contact closure (switch or push button)
to reset alarms
Table 4-1 - CUB Default Inputs