ACS-PCM2-5
POWER CONTROL MODULE FOR USE WITH RAYCHEM ACS-UIT2
INSTALLATION INSTRUCTIONS
DESCRIPTION
The ACS-PCM2-5 provides ground-fault and line current sensing,
alarming, switching (electromechanical relays) and RTD inputs for five
heat tracing circuits when used with the ACS-UIT2.
The ACS-PCM2-5 enclosure is rated NEMA 4/12 and is approved
for nonhazardous indoor and outdoor locations that are subject to
freezing.These instructions describe how to mount the ACS-PCM2-5
and make the various power, communications, and RTD wiring
connections. All electrical connections, maintenance and servicing
must be done by a qualified electrician.
If your application conditions are different, or if you have questions,
please contact your Pentair Thermal Building Solutions representative
or contact Pentair Thermal Building Solutions directly
at (800) 545-6258.
TOOLS REQUIRED
• Drill to mount enclosure
• Small flat-head screwdriver
• Phillips (cross-head) screwdriver
APPROVALS/CERTIFICATIONS
Nonhazardous Locations
ADDITIONAL MATERIALS REQUIRED
UL STD 508A
CAN/CSA C22.2 NO. 14
• RS-485 cable (Belden #8761 or Carol # C2514)
• Wall fasteners for surface mounting (four screws)
• ACS-30 Programming Guide (H58279)
• ACS-UIT2 Installation Instruction (H58239)
General
Communication to ACS-UIT2
Ambient Operating Temp. –13°F to 122°F (–25°C to 50°C)
Dimensions
24 in. W X 24 in. H X 6.75 in. D
(610 mm W X 610 mm H X 171 mm D)
Enclosure Rating
NEMA 4/12 (Indoor/outdoor locations)
Weight
70 lbs (31.75 kg)
Humidity
0 – 90% non-condensing
Fuse
Bussman MDL
Input
100 – 277 Vac (from Ch 1 to power control devices)
Type
Cable
Length
Quantity
Control Contactors
Rating
3-pole – 30 A/pole 277 V Max
Type
Sprecher-Schuh CA7-16-10-12D
Quantity5
THERMAL BUILDING SOLUTIONS
Max current
Accuracy
60 A
± 2% of reading
Ground-Fault Sensors
Range
Accuracy
Type
Power Supply/Line/Load #22 – 8 AWG
RS-485
#24 – 12 AWG
RTD
#24 – 12 AWG
FIRE HAZARD: Do not mount the ACS-PCM2-5
in a hazardous location.
SHOCK HAZARD: Follow all local electrical safety
procedures. Disconnect power before servicing or
opening this unit.
Line Current Sensors
10 – 200 mA
± 4% of range at 30 A line current
Temperature Sensors
Connection Terminals
WARNING:
2 wire RS-485
One shielded twisted pair
4000 ft (1200 m) maximum
Up to 52 ACS-PCM2-5 panels may be connected to
one ACS-UIT2.
Quantity
100-ohm platinum RTD, 3-wire,
α = 0.00385 ohm/ohm/°C
Can be extended with a 3-conductor shielded cable of
20 ohm maximum per conductor
Up to five wired directly to each ACS-CRM
IMPORTANT:
The ACS-PCM2-5 is an electronic unit. During
installation, take the following precautions to
avoid damage to its electronic components.
• Handle with care to avoid mechanical damage.
• Keep electronics dry.
• Avoid exposure to static electricity.
• Avoid contamination with metal filings,
liquids, or other foreign matter.
EN-RaychemACSPCM25-IM-H58672 03/15
• Take care to protect the user interface board
on the enclosure door.
• Use agency-approved conduit bushings,
adapters, and cable glands to keep the
enclosure protected from dust and fluids.
1/8
Panel Layout
ItemQty Description

TB 17
TB 16
TB 15
TB 5
TB 4
TB 14

C3
TB 3
C2
TB 2
C1

TB 1
1
B
1NGC-30-CTM
(current transfer
module)
C
D
E
F
5
3-pole contactors
5
RTD Inputs
9
Status LEDs
1
120–277 Vac to 12
Vdc power supply
G
H
I
1
Alarm relay
1
Dry alarm contacts
3
RS-485 (IN) terminal blocks
J
3
RS-485 (OUT) terminal blocks
K
5
Line in terminal
blocks
L
5
Load out terminal
blocks
M
N
3
Power supply input
1
Grounding bar
C5
TB 19
1 2 3
TB 6
C4
TB 13

A
TB 12
TB 7
MSB
LSB


 

 

ACS-CRM (card
rack module)
ACS-PCM2-5 Terminal Block Layout
Alarm Relay
Alarm
(factory
wired) Dry Contacts


Heater Power Input



In
Out
NC
Com
NO
NO
Com
NC
–
+ Shld –
1
2
3
L1 L2/N
Ground Bar

Heating cable power
in and out: 120-277 Vac
THERMAL BUILDING SOLUTIONS

4
5
1
2
3

4
5
+ Shld
External device
Front Panel
Signal Light
Power Supply
Input
Heater Power Output (factory wired)
Heating Cable Power: 120–277 Vac
RS-485
Communications
EN-RaychemACSPCM25-IM-H58672 03/15
L1
L2
Heating cable
Braid/Sheath
Heating Cable Connection
2/8
Mounting the Enclosure
The Raychem ACS-PCM2-5 controller must be mounted in a nonhazardous location. The panel is rated NEMA 4/12 with an ambient
range of –13°F to 122°F (–25°C to 50°C).
Heater Power Input and Ground (See schematic on Page 2)
Heater Power Output and Ground (See schematic on Page 2)
Heater Power Input K and Ground N
1. Locate the Heater Power Input (K) terminal block (No 1 – 10)
and connect per the ACS-PCM2-5 Terminal Block Layout on
page 2. Depending upon size and type of the remotely located
branch circuit breakers*, use the appropriate size and number
of wires from the circuit breaker to the Heater Power Input
terminals.
Heater Power Output J and Ground N
1. Locate the Ground Bus bar (N) and using the appropriate size
wire, connect a ground wire from the ground bus bar to the
heating cable’s power connection enclosure and terminate to
the heating cable’s braid.
Control Power
2. Locate the Ground Bus bar (N) and using the appropriate size
wire, connect a common ground wire from the branch circuit
breaker panel board.
No additional voltage supply is required to power the internal
ACS-CRM board, alarm light and contactors. Theses devices are
powered from 100-277 Vac tapped from circuit 1 heating cable
power input. If a dedicated input power supply is required contact
Pentair Thermal Building Solutions for assistance.
Note:
1. The ACS-PCM2-5 has integrated ground-fault circuit protection
and therefore does not require additional ground-fault protection
when connecting it to power.
2. Circuit breakers can be the following:
Voltage
# of
poles
Connection
Maximum
C.B. size
*120
1
phase to neutral
30 A
208
2
phase to phase
30 A
240
2
phase to phase
30 A
*277
1
phase to neutral
30 A
*For 120 and 277 V, bring a separate neutral from each breaker
THERMAL BUILDING SOLUTIONS
EN-RaychemACSPCM25-IM-H58672 03/15
3/8
Connecting the RS-485 Device Network
The ACS-UIT2 display is typically linked to a network of Raychem ACS-PCM2-5 power panels (incorporating the ACS-CRMs) and optional
RMM2 devices. These are connected to the Raychem ACS-UIT2 using an RS-485 communication cable (shielded, two conductor, twisted
pair). The following illustration shows how the RS-485 network for the ACS system can be configured.
Device must be mounted in series.
(Terminated devices are shown in gray)
ACS-UIT2
Branching of the network is not allowed.
Connect no more than two RS-485 cables to any device.
RMM2
0
RMM2
0
ACS-PCM2-5
HEAT TRACE CONTROL PANEL
ACS-UIT2
ACS-UIT2
DANGER
MAXIMUM
277 VOLTS
ACS-PCM2-5
MODEL NO: ACCS-PCM2-5
ENCLOSURE: TYPE 4, 12
sSERIAL NO: XXXXXXXX-XXXX
VOLTAGE: MAX 277 VAC, 1PHASE, 2 WIRE, 60 HZ
SHORT CIRCUIT CURRENT 5kA RMS SYMMETRICAL,
277 VAC MAZIMUM
HEAT TRACE CONTROL PANEL
ACS-PCM2-5
HEAT TRACE CONTROL PANEL
DANGER
MAXIMUM
277 VOLTS
MODEL NO: ACCS-PCM2-5
ENCLOSURE: TYPE 4, 12
sSERIAL NO: XXXXXXXX-XXXX
VOLTAGE: MAX 277 VAC, 1PHASE, 2 WIRE, 60 HZ
SHORT CIRCUIT CURRENT 5kA RMS SYMMETRICAL,
277 VAC MAZIMUM
DANGER
MAXIMUM
277 VOLTS
ACS-PCM2-5
MODEL NO: ACCS-PCM2-5
ENCLOSURE: TYPE 4, 12
sSERIAL NO: XXXXXXXX-XXXX
VOLTAGE: MAX 277 VAC, 1PHASE, 2 WIRE, 60 HZ
SHORT CIRCUIT CURRENT 5kA RMS SYMMETRICAL,
277 VAC MAZIMUM
HEAT TRACE CONTROL PANEL
RMM2
Jumper
0
DANGER
MAXIMUM
277 VOLTS
RMM2
Jumper
MODEL NO: ACCS-PCM2-5
ENCLOSURE: TYPE 4, 12
sSERIAL NO: XXXXXXXX-XXXX
VOLTAGE: MAX 277 VAC, 1PHASE, 2 WIRE, 60 HZ
SHORT CIRCUIT CURRENT 5kA RMS SYMMETRICAL,
277 VAC MAZIMUM
0
ACS-PCM2-5
HEAT TRACE CONTROL PANEL
DANGER
MAXIMUM
277 VOLTS
MODEL NO: ACCS-PCM2-5
ENCLOSURE: TYPE 4, 12
sSERIAL NO: XXXXXXXX-XXXX
VOLTAGE: MAX 277 VAC, 1PHASE, 2 WIRE, 60 HZ
SHORT CIRCUIT CURRENT 5kA RMS SYMMETRICAL,
277 VAC MAZIMUM
In order for the RS-485 network to work properly, you must enable the termination resistor for the first and last device. The devices
shown in gray in the illustration above represent the devices for which you must enable the termination resistors. The devices that are
not grayed out represent the devices for which you should not enable the termination resistors.
THERMAL BUILDING SOLUTIONS
EN-RaychemACSPCM25-IM-H58672 03/15
4/8
Connection
You must make an RS-485 connection from the ACS-UIT2 to the ACS-CRM board in the ACS-PCM2-5 panel. To make this connection, a
pre-wired terminal block has been provided in the ACS-UIT2 (TB3- terminals 1, 2, and 3) and in the ACS-PCM2-5 panel (TB (H) and (I)).
Connect the RS-485 wire from TB3 in the ACS-UIT2 and the other end to the TB (H) in the ACS-PCM2-5 panel maintaining the correct
polarity. If the ACS-UIT2 or ACS-CRM is the first or last device in the RS-485 network, see below for details on how to terminate the RS485 network.
ACS-PCM2-5 (Panel 1)
ACS-UIT2

Input
To downstream devices
(ACS-PCM2-5, RMM2)
+
5
–
+
–
4
3
2
1
5
4
3
2
1
T 9
8
7
6
T 9
8
7
6
RS-485
Field Port
ACS-PCM2-5 (Panel 2)
RS-485
RS-485


Output
Input

Output
BMS gateway
RS-485
Remote Port
To next
ACS-PCM-5
or RMM2
Termination of RS-485 Network (if First or Last in Network)
ACS-UIT2
ACS-CRM A
RS-485-2
Termination
RS-485-1
Termination
3 2 1
MSB
Pull-down
Pull-up
Termination
2
Position
Switch
On
Off
Comments
Pull-down
(As-shipped
default) RS-485
network “–”
signal is forced
to a determinate
state when idle.
RS-485 network
“–” signal is not
forced to a determinate state
when idle.
One device (typically
this ACS-UIT2) on
the RS-485 network
should force the
network “–” signal to
a determinate state.
(As-shipped
default) RS-485
network “+”
signal is forced
to a determinate
state when idle.
RS-485 network
“+” signal is not
forced to a determinate state
when idle.
One device (typically
this ACS-UIT2) on
the RS-485 network
should force the
network “+” signal to
a determinate state.
Termination (As-shipped
RS-485 network
default) RS-485 is not terminetwork is
nated.
terminated with
120-ohm resistor.
Terminate the device
(ACS-UIT2 or other)
that is at each end of
the RS-485 network,
for a total of two
terminated devices.
No other devices on
the network should
be terminated.
Pull-up
LSB
1
ON
THERMAL BUILDING SOLUTIONS
3
4
TB 12
TB 7
TB 1
TB 2
TB 3
TB 4
TB 5
TB 13
TB 14
TB 15
TB 16
TB 17
1 2 3
TB 19
TB 6
5
1 Address Switches
2 RTD Inputs (x5)
3 Alarm Output
6
4 Relay Outputs (x5)
5 Status LEDs
6 End of Line (EOL) jumper
End of Line (EOL) Jumper 6
If this device (ACS-CRM) is the last device
in the RS-485 network, the J1 jumper needs
to bemoved from terminals 2 & 3 to
terminals 1 & 2.
EN-RaychemACSPCM25-IM-H58672 03/15
Normal
position
End of Line
position
1 2 3
1 2 3
5/8
Optional RMM2 Installed in the Field
Refer to the RMM2 Installation Instructions (H56848) for field installation instructions. You must connect an RS-485 cable from the
RMM2 to the Raychem ACS-PCM2-5 panel. To make this connection, a pre-wired terminal block has been provided in the Raychem
ACS-PCM2-5 panel. Connect the RS-485 wire from the RMM2 to the
RS-485 terminal block (either H or I) while maintaining the correct
polarity as shown below. If the RMM2 is the first or last device in
the RS-485 network, connect the J17 termination jumper to pins
1 and 2. If the RMM2 is not the first or last device in the RS-485
network, connect the J17 termination jumper to pins 2 and 3.
Connecting RTD Sensors - As Required
RTD Inputs 2
3-wire RTDs with shield may be connected to RTD Ch1 thru Ch5 (TB1 – TB5).
The two common wires (usually red, red)
are connected to terminals 2 & 3, the
source (usually white) to terminal 1 and
the braid to terminal 4 (earth ground).
4
3
2
1
per each ACS-CRM board
RTD connected directly to the CRM board
Chassis Ground
Shield
CH5 – RTD5
Terminal
Number
Red
Red
White
RTD
4
3
2
1
RTD
4
3
2
1
RTD
4
3
2
1
RTD
4
3
2
1
RTD
4
3
2
1
Shield
CH4 – RTD4
CRM
PCB
Shield
CH3 – RTD3
Shield
CH2 – RTD2
Last RMM2 in network
Shield
CH1 – RTD1
Default position (for all RMM2
units in network except first
or last one)
Termination mode
(first or last RMM2
in network)
Connecting External Device Input (Snow Controller, Override Device)
The RMM2 uses address range 32 – 47. Refer to the RMM2 Heat
Tracing Remote Monitoring Module Installation Instruction
(H56848) for setting address switch.
Setting Address Switches on CRM Board
Connect 2-wire shielded cable from the normally open position of
the external device dry contacts to the RTD input terminals on the
ACS-CRM Board.
Connect the cable to terminals 1 and 3 with a jumper between
position 2 and 3 as shown below:
Address Switches (SW1 & SW2) 1
THERMAL BUILDING SOLUTIONS
ACS-PCM2-5
Chassis Ground
LSB
8
MSB
External Device or Snow
Controller (Dry Contact)
SW2
SW1

ACS-CRM
Board RTD Input
3
Each ACS-CRM must have a unique communication address. The valid address switch
range for the ACS-UIT2 is 1–99. SW1 is the
ones digit (0–9) and SW2 is the tens digit
(0–9).
Note: When adding an ACS-CRM to the system, you must first cycle power on the CRM
board and then perform a network update
at the ACS-UIT2.
EN-RaychemACSPCM25-IM-H58672 03/15
Ground
4
3
2
Jumper
No
1
6/8
Communications and Function Status LEDs
Status LEDs 5
A cluster of 9 LED's are positioned on the CRM board which
present the status of the circuit in the ACS-PCM2-5 panel.
MSB
LSB
1
2
Relay 5 (red)
TB 1
3
4
TB 12
TB 7
TB 2
TB 3
TB 4
TB 5
Rx (yellow)
1 2 3
TB 19
Tx (yellow)
TB 6
TB 13
5
TB 14
TB 15
TB 16
TB 17
6
Relay 4 (red)
Relay 3 (red)
1 Address Switches
2 RTD Inputs (x5)
3 Alarm Output
4 Relay Outputs (x5)
5 Status LEDs
6 End of Line (EOL) jumper
Relay 2 (red)
Relay 1 (red)
Alarm (red)
Power (green)
The following table summarizes the Status LEDs:
Function
Color
Description
Power
Green
Indicates power is supplied to the ACSCRM board.
Alarm
Red
Indicates that the ACS-CRM board registered an alarm condition. Check the ACSUIT2 screen for events log to determine the
alarm condition and to re-set the boards.
Relay 1-5 Red
Indicates that the heating cable relay is
energized.
Rx
Yellow
Flickering indicates data reception
Tx
Yellow
Flickering indicates data transmission
THERMAL BUILDING SOLUTIONS
EN-RaychemACSPCM25-IM-H58672 03/15
7/8
WWW.PENTAIRTHERMAL.COM
NORTH AMERICA
EUROPE, MIDDLE EAST, AFRICA
ASIA PACIFIC
LATIN AMERICA
Tel:+1.800.545.6258
Fax:+1.800.527.5703
Tel:+1.650.216.1526
Fax:+1.650.474.7215
thermal.info@pentair.com
Tel:+32.16.213.511
Fax:+32.16.213.603
thermal.info@pentair.com
Tel:+86.21.2412.1688
Fax:+86.21.5426.2937
cn.thermal.info@pentair.com
Tel.:+1.713.868.4800
Fax:+1.713.868.2333
thermal.info@pentair.com
Pentair is owned by Pentair or its global affiliates. All other trademarks are the property of their respective owners. Pentair reserves the right to change
specifications without prior notice.
© 2010-2014 Pentair.
THERMAL BUILDING SOLUTIONS
EN-RaychemACSPCM25-IM-H58672 03/15
8/8