Emerson CUB-II, CUB-TD Operation Manual
MultiFlex Condensing Unit Board
(CUB-II and CUB-TD) Installation and
Operation Manual
026-1705 Rev 8
Emerson Commercial and Residential Solutions
1065 Big Shanty Road NW, Suite 100
Kennesaw, GA 30144
770-425-2724 • 1-800-829-2724
Email: ColdChain.TechnicalServices@Emerson.com
www.emerson.com
Contents
1 OVERVIEW OF THE MULTIFLEX CUB-II AND CUB-TD .................................................................................. 1
1.1. T
HE MULTIFLEX CUB-II.............................................................................................................................................. 1
1.2. T
HE MULTIFLEX CUB-TD ........................................................................................................................................... 1
2 MOUNTING AND POWERING.................................................................................................................................. 2
2.1. S
NAP-TRACK INSTALLATION ........................................................................................................................................ 2
2.2. T
HE PLUG-IN OUTPUT BOARD ..................................................................................................................................... 3
2.3. P
OWERING 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) .................................................................................... 4
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. W
IRING 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. T
HE 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. T
HE 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. S
TATUS LED............................................................................................................................................................... 13
5.2. T
X AND RX LEDS....................................................................................................................................................... 13
5.3. C
ODE A AND CODE B LEDS ...................................................................................................................................... 13
5.4. R
ELAY OUTPUT LEDS ................................................................................................................................................ 14
6 MULTIFLEX CUB-II AND CUB-TD SOFTWARE OVERVIEW ........................................................................ 15
6.1. C
OMPRESSOR 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
6.2. CONDENSER FAN CONTROL........................................................................................................................................ 16
6.2.1. Temperature Differential (TD) Strategy ............................................................................................................. 16
6 • Table of Contents 026-1705 Rev 8
6.2.1.1. TD Control Fail-Safes ....................................................................................................................................................... 16
6.2.2. Pressure Control Strategy................................................................................................................................... 16
6.2.3. Case Temperature Control.................................................................................................................................. 16
6.3. D
EFROST CONTROL .................................................................................................................................................... 17
6.3.1. Defrost Termination............................................................................................................................................ 17
6.4. S
ENSOR 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) ..................................................................................................................... 18
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 ................................................................................................................. 19
6.5.4. Phase Fail Mode ................................................................................................................................................. 20
6.6. D
OOR SWITCHES AND CLEAN (WASH) SWITCHES ..................................................................................................... 20
6.6.1. Door Switches ..................................................................................................................................................... 20
6.6.2. Clean (Wash) Switches........................................................................................................................................ 20
7 THE MULTIFLEX CUB E2/ EINSTEIN INTERFACE ......................................................................................... 21
7.1. A
DDING/DELETING A CUB ........................................................................................................................................ 21
7.1.1. Adding a CUB ..................................................................................................................................................... 21
7.1.2. Deleting a CUB................................................................................................................................................... 22
7.2. V
IEWING THE CUB STATUS SCREEN ......................................................................................................................... 22
7.2.1. Inputs and Setpoints............................................................................................................................................ 23
7.2.2. Sensor Control .................................................................................................................................................... 24
7.2.3. Outputs and Operational States .......................................................................................................................... 24
7.2.4. Defrost................................................................................................................................................................. 25
7.2.5. KW Usage ........................................................................................................................................................... 25
7.3. P
ROGRAMMING THE CUB
U
SING THE E2 OR EINSTEIN FRONT PANEL ......................................................................................................................... 25
7.3.1. Screen 1: General ............................................................................................................................................... 26
7.3.2. Screen 2: Setpoints.............................................................................................................................................. 27
7.3.2.1. Temperature Differential (TD) ......................................................................................................................................... 29
7.3.2.2. Traditional Strategy .......................................................................................................................................................... 30
7.3.3. Screen 3: Inputs .................................................................................................................................................. 30
7.3.4. Screen 4: Aux Inputs ........................................................................................................................................... 31
7.3.5. Screen 5: CUB Inputs ......................................................................................................................................... 32
7.3.6. Screen 6: Defrost ................................................................................................................................................ 33
7.3.7. Screen 7: Outputs................................................................................................................................................ 35
7.3.8. Screen 8: CUB Outputs....................................................................................................................................... 37
7.3.9. Screen 9: Sensor Control .................................................................................................................................... 37
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 ............................................................................................................................... 40
7.3.10.4. Compressor Proof Alarms .............................................................................................................................................. 41
7.3.10.5. Phase Fail Shutdown ....................................................................................................................................................... 41
7.3.10.6. Door Switch Alarms ....................................................................................................................................................... 41
7.3.10.7. Wash Active Alarms ....................................................................................................................................................... 42
7.3.10.8. Case Temperature Alarms .............................................................................................................................................. 42
7.3.10.9. Suction Temperature Alarms.......................................................................................................................................... 42
7.3.10.10. TD Condenser Control Alarms..................................................................................................................................... 43
8 THE MULTIFLEX CUB HAND-HELD INTERFACE........................................................................................... 44
MultiFlex CUB-II and CUB-TD I&O Guide Table of Contents • 7
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. A
LTERING CUB
C
ONFIGURATION 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 ................................................................................................................................................................... 55
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 ....................................................................................................................................................................... 57
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
8.2.10.4. Sensor Control Screen 4 (Alarm Priority, Comb Method) ............................................................................................. 60
8 • Table of Contents 026-1705 Rev 8
APPENDIX A: TD QUICK START ............................................................................................................................... 62
S
ET UP MOTOR ROOM TEMPERATURE AND PLENUM TEMPERATURE INPUTS .................................................................... 62
Global Data Setup Example......................................................................................................................................... 62
C
ONFIGURING SETPOINTS IN E2 OR EINSTEIN FOR CUB-TD.............................................................................................. 64
CUB Inputs ...................................................................................................................................................................................... 64
CUB Outputs.................................................................................................................................................................................... 65
General............................................................................................................................................................................................. 65
Setpoints........................................................................................................................................................................................... 66
Alarms.............................................................................................................................................................................................. 66
APPENDIX B: CASE TYPE DEFAULTS ..................................................................................................................... 68
REVISIONS....................................................................................................................................................................... 70
MultiFlex CUB-II and CUB-TD I&O Guide Table of Contents • 9
1Overview of the
MultiFlex CUB-II and
CUB-TD
The MultiFlex CUB-II and CUB-TD boards are
“smart” input/output boards designed to
control single condensing units. A single
condensing unit is a self-contained compressor
and condenser bearing unit which controls
refrigeration in a single case line-up or walk-in
cooler. The MultiFlex CUB-II controllers are
capable of commanding compressors,
condensers, refrigeration, 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
activating and deactivating compressors, defrost,
and condenser fans.
Independent System Control
The MultiFlex CUB-II and CUB-TD
controllers are equipped with software and an
enhanced processor, which gives them the
capability of controlling independently without
the need of a central controller (such as
Emerson’s E2 or Einstein RX Refrigeration
Controller). However, the CUB-II and CUB-TD
are designed to interface with an E2 or Einstein
for purposes of displaying status on status
screens, reporting alarms, and recording logs.
The CUB-II and CUB-TD may be configured
either with an Emerson Hand-Held Terminal
(HHT) or through the E2 or Einstein front panel.
1.1. The MultiFlex CUB-II
The MultiFlex CUB-II controllers are capable 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
temperature).
1.2. The MultiFlex CUB-TD
The MultiFlex CUB-TD is a “stripped” version
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
difference between the two temperatures as a
control 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 capabilities
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
condensing unit subsystem, a CUB-II will
necessary.
The MultiFlex CUB-II Overview of the MultiFlex CUB-II and CUB-TD • 1
2 Mounting and
Powering
The MultiFlex boards are usually mounted by
the refrigeration equipment manufacturer.
Therefore, the installer need only make the
necessary 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; however, for
ease of network configuration, it is
recommended 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
accessible 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 2-1 - MultiFlex Snap-Track Mounting
Figure 2-2 provides mounting dimensions
for the MultiFlex board.
Figure 2-2 - MultiFlex Board Dimensions
2 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 8
2.2. The Plug-In Output Board
Figure 2-3 - Exploded View — MultiFlex CUB-II
The additional board makes the MultiFlex CUB
boards considerably taller than the MultiFlex 16
and other Emerson 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
WARNING: All models of MultiFlex require a
24VAC Class 2 input power source. The
MultiFlex CUB-II requires the power source
to be non-center-tapped. Refer to Section
2.3.1., Choosing Transformer Sizes for center tap
usage.
Emerson supplies a wide variety of 24VAC
transformers with varying sizes and either with
or without center taps. Table 2-1 shows the
transformer sizes and whether they are centertapped or non-center-tapped.
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.
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
The Plug-In Output Board Mounting and Powering • 3
2.3.1. Choosing Transformer Sizes
POWER LED
New Style
MultiFlex Board
(Top Left Corner)
NO POWER LED
Old Style
MultiFlex Board
(Top Left Corner)
24 VAC
24 VAC
In most site installations, a single transformer
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.
Unit VA VAC Cent er-
Tapped?
MultiFlex 16 624Yes
MultiFlex 88,
88AO, 168, and
168AO
MultiFlex RTU 15 24 No
MultiFlex CUB 15 24 No
Table 2-2 - Device Power Requirements
15 24 No
A new-style MultiFlex board has a green power
LED located next to the 24VAC connection
terminal in the upper right corner of the circuit
board (see Figure 2-4 for reference).
2.3.2. MultiFlex CUB Power Wiring
The MultiFlex CUB boards do not use a center
tap. Instead, the 0V terminal on the board should
be connected to a separate earth ground.
Important! The rules that must be
followed when connecting a MultiFlex CUB
board to a transformer are different
depending on whether you have a "new style"
MultiFlex 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).
2.3.2.1. New-Style MultiFlex CUB Boards
(With Isolated Power Supply)
The new-style MultiFlex board can be connected
to any of the center-tapped transformers
mentioned in Table 2-2, provided the 0V
terminal of the board is connected to an earth
Figure 2-4 - New-Style vs. Old-Style MultiFlex Board
If there is a green power LED next to the
connector, your MultiFlex is a new-style
MultiFlex -- refer to Section 2.3.2.1., New-Style
MultiFlex 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
MultiFlex -- refer to Section 2.3.2.2., Old-Style
MultiFlex CUB Boards (No Isolated Power
Supply) for power wiring instructions.
ground.
NOTE: 14AWG or larger should be used for
earth ground and the length should be kept
short. Less than six inches is preferred.
4 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 8
A center-tapped transformer may power both
Earth ground.
Use 14 AWG or
larger.
Keep as short
as possible.
Less
than six inches
is preferred.
center-tapped and non-center-tapped
evices at the same time, as long as none of the
non-center-tapped MultiFlex boards are
old-style MultiFlex boards. If an old-style
MultiFlex 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 center-tapped transformer.
Figure 2-5 - Wiring Non-Center-Tapped MultiFlex Boards to
Transformers With a Center Tap
2.3.2.2. Old-Style MultiFlex CUB Boards
(No Isolated Power Supply)
Like the new-style MultiFlex board, the oldstyle 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 oldstyle MultiFlex board to an earth ground.
Do not connect the center tap of the
transformer 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
transformer that is powering a MultiFlex 16,
16AI, 8RO, 4AO, 8DO, or any previous
generation Emerson board that uses centertapped power. Doing so will destroy the
MultiFlex board.
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
transformers to the MultiFlex boards.
Figure 2-6 - Non-Center-Tapped Transformer Wiring
Powering the MultiFlex CUB Board Mounting and Powering • 5
Rule 3: The secondary of the transformer
must not be grounded on any side.
Use these formulas to determine if the wire
gauge you are using fits within specification:
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
Distances
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
transformer 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).
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
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 transformer’s
VA rating, and the sensors have an isolated
power supply. If the sensors do not have an
isolated power supply, they could be damaged if
connected with center-tapped or grounded
secondary transformers.
Power Wiring Types
14 AWG Belden 9495
18 AWG Belden 9493
Table 2-3 - Power Wiring Types
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.
6 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 8
3The I/O Network
Although the MultiFlex CUB can operate as a
stand-alone controller, it relies on an E2,
Einstein, or REFLECS unit for advanced
features such as remote dial-in/dial-out, logging,
and alarm control. All MultiFlex boards and
controllers use an RS485 Network connection to
communicate with an E2, Einstein, and
REFLECS site controllers. Technicians who are
familiar with Emerson’s previous generation
16AI, 8IO, and ARTC boards will find the
network setup procedure for the MultiFlex CUB
boards to be very much the same.
3.1. Wiring Types
Emerson 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:
output communication boards, and terminates at
the last input or output board on the network. A
diagram of this network arrangement is shown in
Figure 3-1.
Figure 3-1 - I/O Network Configurations
3.1.2. Network ID Numbers
Each device on an RS485 segment has a network
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.
Shielded? Yes
Conductor Type Twisted Pair
Gauge 18 - 24 AWG
Capacitance between
signal wires
Capacitance between
signal and shield
Nominal Impedance 12050
Table 3-1 - RS485 I/O Network Wiring Specifications
31 pF/ft or less
59 pF/ft or less
3.1.1. Daisy Chains
The RS485 Input/Output (I/O) Network
connects 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
Boards of the same type should be numbered in
sequence, starting with one and continuing with
two, three, and so forth.
Wiring Types The I/O Network • 7
3.1.2.1. Numbering the MultiFlex
CUB
The MultiFlex CUB is a unique board type on
the RS485 Network by the Emerson 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.
3.1.4. Setting the Terminating
Resistance 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
resistance jumper settings for the E2, Einstein,
and for all I/O boards.
Figure 3-2 - CUB-II Baud Rate Switches
3.1.3. Setting the Baud Rate
All I/O boards have dip switches that determine
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
recommendation (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.
8 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 8
Figure 3-3 - I/O Network Termination Jumper Settings
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
MultiFlex 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
corresponds 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.
All Pressure Transducers, Humidity Sensors, and
Refrigeration 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
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
Sensors
Temperature and air flow sensors are to be
wired with shielded, 2 conductor, at least 22 GA
wire (Belden # 8761 or equivalent).
The Inputs CUB Input and Output Setup • 9
Figure 4-2 - Input Type Dip Switches for CUB Board
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.
Figure 4-3 - Input Board Power Sources
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 powered
off the MultiFlex’s own 24VAC power
connection. 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
Transformer
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
terminals AC1 and AC2.
This can only be done with sensors that keep the
24VAC signal isolated from its DC output signal
(such as Emerson’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
Locations
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
control systems. Because input locations are
specified 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
easier, the CUB has assigned default sensor
locations 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).
CUB Input
Point
Number
1 Suction
2 Discharge
3 Oil Trans-
4 Case 1
16 Alarm
Label
Transducer
Transducer
ducer
Temp
Reset
Sensor to Connect
To This Point
0-100PSI Pressure
Transducer, measuring
suction pressure
0-500PSI Pressure
Transducer, measuring
discharge pressure
0-200PSI Pressure
Transducer, for
measuring oil pressure
Discharge air
temperature sensor for
the cooler or case
lineup
Digital contact closure
(switch or push button)
to reset alarms
Table 4-1 - CUB Default Inputs
10 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 8
4.2. The Outputs
The MultiFlex CUB has eight relays that
energize and de-energize to control output loads.
Decision #1 is made by setting the fail-safe
switch. This is a bank of eight switches on the
plug-in output module. Each switch corresponds
to an output on the board (switch #1 = output #1,
etc.).
When setting up an output on one of these relays,
you must make two important decisions:
1. Do you want an ON command from your
controller to mean “energize the relay” or
“de-energize the relay,” and
2. When the relay is de-energized, as is the case
when the CUB goes offline or loses power,
do you want the contacts to be OPEN or
CLOSED?
HHT
Display
ON
OFF
ON
OFF
ON
OFF
Contact
State
CLOSED
OPEN
OPEN
CLOSED
CLOSED
OPEN
Equipment
State
ON
OFF
OFF
ON
OFF
ON
Fail Safe
ON UP N.C
OFF UP N.O
OFF UP N.C.
Decision #2 is made either by setting a fail-safe
jumper (for the MultiFlex CUB) or by wiring
the load to either the N.O. or N.C. terminals on
the Form C contact (for the MultiFlex 16I8O).
Table 4-2 shows how the fail-safe switch and
Form C contacts should be configured based on
how you want the output to perform during both
normal operation and during network/power
loss.
Set Failsafe Switch
To:
Form C Contacts
Used:
ON
OFF
ON
OFF
ON
OFF
Table 4-2 - Output Board Fail-Safe and Switch Settings
CLOSED
OPEN
OPEN
CLOSEDONOFF
CLOSED
OPEN
OFF
ON
ON
OFF
ON DOWN N.O
OFF DOWN N.C
OFF DOWN N.O
The Outputs CUB Input and Output Setup • 11
4.2.1. Relay Output Ratings and Fuse
RELAY IS
CLOSED
ON POWE R
FAILURE
RELAY IS
OPEN ON
POWER
FAILURE
Protection
Each relay output on the MultiFlex Combination
I/O boards is rated for up to 240 VAC with a
maximum current of 2 amps.
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 7.3.7., Screen 7: Outputs
and Section 8.2.8., Outputs Screens).
Each relay is fused with a 2 amp fast-blow 5mm
x 20mm fuse, Bussman GMA-2 or equivalent.
4.2.2. Wiring Outputs to Points
The MultiFlex CUB has Form C relay contacts.
Figure 4-4 shows how to wire the three-terminal
Form C contact.
One wire of the two-wire connection should
always be connected to the middle terminal. The
second wire must either be connected to the N.C.
terminal (if you want the path to be closed when
the relay is de-energized) or the N.O. terminal (if
you want the path to be open during power
failure).
N.C. N.O. N.C. N.O.
Figure 4-4 - Form C Contact Wiring
CUB
Output
Point
Number
1 Compres-
2 Defrost Electric defrost heaters
3 Condenser
8 Alarm Out-
Table 4-3 - CUB Default Outputs
Label
sor
Fan #1
put
Device to Connect
To This Point
Compressor
or hot gas valve
Condenser fan (or 1st
condenser fan if
multiple fans are
present)
Digital contact closure
that is ON when an
alarm condition is
active in the
condensing unit.
4.2.3. MultiFlex CUB Fixed Outputs
The MultiFlex CUB supports a large number of
different types of output devices that might be
found on a single condensing unit’s pressure
control, condenser control, or refrigeration
control systems. Because output locations are
specified by the user in the system software, you
can connect outputs from the condensing unit to
any point on the CUB. However, to make setup
easier, the CUB has assigned default sensor
locations to a few of the inputs on the board.
12 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 8
5 Board Status LEDs
When a MultiFlex board is powered up, you will
be able to determine the operating status of the
board by observing its status LEDs. Figure 5-1
shows the location of the MultiFlex’s status
LEDs.
Figure 5-1 - MultiFlex Status LED Locations
5.1. Status LED
The Status LED blinks green once per second to
show that the board is powered and operational.
If this light is dark, the board has likely lost
power.
5.2. Tx and Rx LEDs
The Tx and Rx LEDs indicate when the
MultiFlex is sending or receiving messages on
the RS485 Network.
The Tx LED blinks once every time the
MultiFlex sends a response to the E2, Einstein,
or REFLECS. The Rx LED blinks once when
the MultiFlex receives a message.
If the MultiFlex is connected to the network and
set up to communicate with the controller, you
should see these lights blinking regularly. If they
do not, there may be a problem with the
network.
5.3. Code A and Code B LEDs
All MultiFlex models except the MultiFlex 16
have two LEDs labeled Code A and Code B.
These LEDs indicate failure conditions. When
these LEDs are OFF, there are no failures active.
When one or both of these LEDs are blinking,
there are failure conditions. The rate of blinking
indicates the type of failure:
Code A Failure Conditions
• Blinking fast (4 times/second) - There is a problem
with the flash memory or hardware clock on this
board. This generally means the board is bad and
must be replaced.
• Blinking slow (1 time/second) - The board is not
receiving any messages addressed to it. This means
Status LED Board Status LEDs • 13
either the I/ O Network is dow n or it has not yet been
commissioned in the E2, Einstein, or REFLECS
Network Configuration screen.
Code B Failure Conditions
• Blinking 2 times/second - The battery on this board
that backs up the CUB configuration during power
failures has failed. If you see this light flashing, the
battery will need to be replaced to avoid loss of
configuration.
Also, check the position of the Enable Battery
jumper, located at the bottom right of the board just
underneath the output plug-in board. If this jumper
is set to the DOWN position, move it to the UP
position. This will enable the battery and should
cause the Code B light to stop flashing.
5.4. Relay Output LEDs
Each relay output point on a MultiFlex has an
indicator LED that shows the status of the
output. This LED is lit to show the output is ON,
and unlit to show the output is OFF.
The definition of ON and OFF in this case is
determined by the position of the fail-safe dip
switch (see Table 4-2). Therefore, if the output’s
switch is UP, a lit LED means the path is
CLOSED for N.C. contacts and OPEN for N.O.
contacts.
14 • MultiFlex CUB-II and CUB-TD I&O Guide 026-1705 Rev 8
6 MultiFlex CUB-II and
CUB-TD Software
Overview
The CUB-II is capable of controlling all vital
systems of a single condensing unit, including
compressors, condenser fans, evaporators and
case circuit systems. Extended logging and
alarm control capabilities require connection to
an E2 or Einstein RX refrigeration controller.
6.1. Compressor Control
Since a single condensing unit has a single
compressor, the MultiFlex CUB-II’s pressure
control strategy uses simple Cut In/Cut Out
strategy for activating and deactivating the
compressor. The compressor may be controlled
either by suction pressure or case temperature.
the setpoint plus one-half the deadband, the
compressor will turn ON and will remain ON
until the case temperature falls below the
setpoint minus one-half the deadband.
NOTE: A suction transducer is required even
for temperature control and is used to prevent
the compressor from operating below the minimum suction pressure setpoint.
6.1.2.1. Pump Down
If the CUB-II is using the Temperature strategy,
it also has the option of using a special Pump
Down mode to pump refrigerant out of the
evaporator coil when going from Refrigeration
to Idle or from Refrigeration to Defrost.
A Pump Down causes the refrigeration solenoid
to shut while keeping the compressor ON. The
compressor will remain ON until the suction
pressure drops below a minimum setpoint (or
until a fail-safe time elapses).
6.1.1. Suction Pressure Compressor
Control
Using the Suction Pressure Control strategy, the
CUB-II compares the suction pressure to a set of
Cut In/Cut Out setpoints. If the suction pressure
rises higher than the Cut In setpoint, the
compressor is activated and remains activated
until the suction pressure falls below the Cut Out
setpoint.
To prevent short-cycling of the compressor,
minimum ON and OFF times may be used in
this strategy.
6.1.2. Case Temperature
Compressor Control
Using the Case Temperature Control strategy,
the CUB-II only activates the compressor when
refrigeration is necessary in the case. This
strategy uses a temperature setpoint and a
deadband. When the case temperature is above
Idle Pump Down With Door Switches
If a door switch is available and Idle Pump
Down mode is enabled, the CUB-II will do a
Pump Down every time a door switch is
activated.
6.1.2.2. Fallback Pressure Setpoints
When in Temperature strategy, if the case
temperature sensors fail or the CUB-II is
otherwise unable to determine the case circuit air
temperature, the CUB-II will cease operating in
Case Temperature Compressor Control mode
and use fallback suction pressure Cut In/Cut Out
setpoints to control the compressor. This
fallback mode operates exactly like the Suction
Pressure Compressor Control mode described in
Section 6.1.1.
The CUB-II will continue to operate using the
fallback pressure setpoints until a case
temperature sensor value becomes available.
The CUB-II will then resume Temperature
strategy control.
Compressor Control MultiFlex CUB-II and CUB-TD Software Overview • 15
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