Emerson NELSON CM-GP User manual

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 1 of 10
November 2020
ADDED FOR
AXPC100-CM-GP
The CM-GP/AXPC100-CM-GP is an electronic
temperature controller with 30-mA ground-fault protection.
It is ideal for all heat tracing applications requiring accurate
temperature monitoring. The controller can be
programmed to maintain temperatures up to 215°C
(419°F) at voltages from 100 to 277 V and can switch
current up to 30 Amperes for the CM-GP or 25 Amperes
for the AXPC100-CM-GP. The CM-GP/AXPC100-CM-GP
is complete with a temperature sensor and is housed in a
NEMA 4X rated enclosure. The controller features an
AC/DC dry alarm contact relay for monitoring critical
applications such as fire protection piping.
These instructions are to be used together with the
installation and maintenance instructions for any heating
cable or power connection kits utilized with this controller.
 Pipe Clamp – PC03, PC12 or PC20 (included)
 Fiberglass Tape – GT6 or GT60
 HC-SPA Small Pipe Adapter – For 1.0”
 RTD (Types RTD-1, RTD-7, or RTD-A)
 Large Cross Blade (Philips) Screwdriver
 Small Cross Blade (Philips) Screwdriver
 Wire Cutters
 Adjustable Wrench (52mm [2.1”] size)
 Needle Nose Pliers
 Large Slotted Screwdriver
AXPC100-CM-GP KIT CONTENTS
QTY ITEM DESCRIPTION
11LID
1 2 WIRE COVER
1 3 BOX WITH ELECTRONICS
1 4 TERMINATION PWR LONG
SILICONE
2 5 GUIDE TUBE
1 6 SEAL END
1 7 TUBE OF SILICONE
1 8 1” NPT ADAPTER
1 9 CABLE RETAINER
110STANDOFF
111LOCK NUT
1 12 3/8” SHRINK TUBE
1 13 CABLE TIE
CM-GP CONTROLLER CONTENTS
QTY ITEM DESCRIPTION
1 1 LID
1 2 WIRE COVER
1 3 BOX WITH ELECTRONICS
DESCRIPTION
OPTIONAL INSTALLATION MATERIAL RECOMMENDED TOOLS
AXPC100-CM-GP Pipe Mounted Option
CM-GP Wall Mounted Option
CM-GP Stand-Alone Option




NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 2 of 10
November 2020
Max Screw size: #10, 0.19in (5mm)
Counterbore size: 0.36in (9mm)
 Attach Enclosure to wall using appropriate mounting
fasteners
WALL MOUNTING THE CM-GP/AXPC100-CM-GP
CONNECTING HEATING CABLE WITH A POWER CONNECTION KIT
CONNECTING HEATING CABLE DIRECTLY TO CM-GP/AXPC100-CM-GP
Left side entry:
½” NPT (0.87in)
Bottom entry:
1” NPT (1.31in
)
Right side entry:
¾” NPT (1.10in)
 Remove the lid and wire cover.
 Bring the power cable from the heater
into the controller, and terminate the two
power cables each into one of the
terminals marked Output.
Terminate the ground wire or braid into
the ground terminal.
 This kit is designed for use with all
wattages of CLT-J, CLT-JT, LT-J, LT-
JT, HLT-J and XLT-J heater cables.
 To directly connect MI cable you must
use a 1 to ¾” reducing bushing with
g
roundin
g
hub.
 Remove the lid and wire cover.
 Terminate the heating cable power wires
in the power connection kit as per the
instructions that come with the kit
 Run the two power output wires of the
power connection kit into the “OUTPUT”
terminals in the controller.
 Connect the ground hub of the power
connection kit to the ground terminal in
the Controller.
 Incoming power should be connected
likewise into the Input terminals

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 3 of 10
November 2020
1 ½” (38 mm)
 Pull excess heating cable
back through standoff.

Allow 1 ½” (3.81 cm) of heating cable
to remain above top of standoff body.
 Carefully slide enclosure adapter over
cable terminations.
 Screw enclosure adapter into standoff
until fully seated at positive stop.
 Mount standoff securely to pipe.
 Insert supplied cable tie through slot
provided to prevent possible rotation
of enclosure.
Note: For pipes 1” (25mm)
and below, install HC_SPA
(purchased separately)
between standoff and pipe.
HC-SPA adapter
for small pipes.
STEP 3 STEP 4
AXPC100-CM-GP STANDOFF INSTALLATION
Enclosure
Adapter
Cable Tie
STEP 2
STEP 1

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 4 of 10
November 2020

Install flex conduit and drain as shown.
 Terminate power and ground wires to terminal
block.
 Install enclosure cover.
Flex Conduit
Conduit Drain

Install thermal insulation and protective
lagging.
 Apply sealant around standoff penetration to
prevent moisture entry.
 Leave installation instructions with end user
for future maintenance and/or trouble
shooting.
 Fill in the blank fields on the label located on
the cover of the junction box as follows:
CIR. NO. – Electrical circuit heating cable
connected to.
CAT. NO. – Type of heating cable used
VOLTS – Operating voltage of heating cable
– Max 277VAC
AMPS – Operating current of heating cable –
Max 30A
STEP 8
 Install enclosure and secure to enclosure
adapter with supplied locknut.
 Do not over tighten locknut
 Enclosure may be rotated in 90° increments
to match installation requirements.
STEP 7
WARNING
 Potential High Temperature –
Ensure proper selection of
power cable
 Heating cable installations require incoming
power wiring to be rated for 105ºC operation.
 Maximum steady-state current may not
exceed 18 amps, 25 amps for XLT cable.
 Verify that all connections are properly
installed and secure.
STEP 5 STEP 6

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 5 of 10
November 2020
Condition N/O N/C
Power Off OPEN CLOSED
Power On CLOSED OPEN
Alarm OPEN CLOSED
CONNECTING INCOMING POWER
CONNECTING TEMPERATURE SENSOR
CONNECTING ALARM WIRING
 Install conduit, fittings, and wires according
to local standards.
 Wire size limits: 18 AWG – 6 AWG
(See installation and maintenance instructions
for self-regulating heater cable for further detail
(GA-1765)).
 In order to minimize loosening due to pipe
vibration, use flexible conduit
 Pull in power and ground wires, strip off
½”(13mm) of insulation and terminate as
shown.
 This unit can be used with any 100Ω,
platinum, 3-wire RTDs
 Adjust the length of the temperature sensor
to meet the application needs Strip the 1/3 ”
(9mm) insulation and either connect an red
ferrule (18AWG) or tin the end.
 Insert the wires into the terminal block on
the plate above as shown.
 Wire size must be within AWG 18-24
 The controller has a dry form C contact
Max.2A 20-277VAC, 12-48VDC
 Connect the alarm wires as shown to either
the NO and C terminals (for normally open)
or NC and C terminals (for normally closed)

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 6 of 10
November 2020
 Install wire cover by attaching it to the plastic standoffs, and ensuring that it snaps in place.
 Program the Controller, see MENU SETTINGS section for details.
 Attach the lid with the included screws
 Leave these instructions with the end user for future reference.
FINISHING INSTALLATION
WIRING VERIFICATION

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 7 of 10
November 2020
The following chart:
 Shows how the items will appear on the Controller
 Lists the parameters in order of appearance on the Controller.
 Lists the default, min. and max values for each parameter.
Menu Items Paramete
r
Default Min Max
Units
(°C or °F) Celsius - -
Maintain
Setpoint
4°C
(40°F)
0°C
(32°F)
218°C
(425°F)
Deadband 3°C
(5°F)
1°C
(2°F)
6°C
(10°F)
High Alarm
Setpoint Off
Setpoint +
deadband +
3°C
(
5°F
)
223°C
(433°F)
Low Alarm
Setpoint Off -9°C
(16°F)
Setpoint -
deadband –
3°C
(
5°F
)
The controller contains 3 LED lights which are viewable through the enclosure window
These lights are as follows:
CM-GP/AXPC100-CM-GP LEDs
MENU SETTINGS
Programing the Controller:
 To enter Settings mode, Press the “MENU” button for 3 seconds and the display will flash “Unit” for
1 second and then C or F depending on current settings.
 To change the setting press “UP” or “DOWN” to reach the desired value.
 To save and move to the next setting press “NEXT”
 Pressing “NEXT” on “Lo ALr” saves and returns to normal mode.
 To save and return to normal mode at any point ot the menu; hold “MENU” for 3 seconds until the
actual temperature is displa
y
ed.
 ACTUAL (Amber):
Indicates the status of the Actual
Temperature as detected by the RTD.
Blinking: The Actual temperature is below
setpoint and the heater is energized.
Solid: The Actual temperature is at or above
the set point, the heater is de-energized.
 SETPOINT (Amber):
Indicates that value on the display is the
setpoint temperature value
 ALARM (Red):
Blinks when an Alarm condition is present.
For alarm details see section
“CM-GP/AXPC100-CM-GP Error Displa
y
s”.

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 8 of 10
November 2020
To Initiate Ground Fault Testing:
GROUND FAULT TESTING
ERROR DISPLAYS
The Controller will display the following upon
detecting an error state:
 Low Temerature Alarm
When Actual temperature(AT) is less
than or equal to the low temperature
alarm value (LTAV), Alarm LED (Red)
will start flashing and the display will
flash as follows: “Lo”, “ALr”,”LtSp”,
LTAV,”Act”, AT
 High Temerature Alarm
When AT is greater than or equal to the
high temperature alarm value (HTAV)
Alarm LED (Red) will start flashing and
the display will flash as follows: “HI”,
“ALr”, “HtSp”, HTAV, “Act”, AT
 Temperature Sensor Alarm
When the RTD is shorted or open, the Alarm LED (Red) will start flashing and the display will start
flashing “Err”, “SnSr” alternatively.
 Ground Fault Trip
When ground fault current is greater than 30mA the Alarm LED will start flashing, and the display
will start flashing “GF”, “triP” alternatively, and the output relay will be deactivated until the fault is
cleared and the GF is reset.
 Press “NEXT” button for 3 seconds
 The Output relay will be energized (if not already) and
artificial leakage current of 40 mA will be induced
 The Output relay should be deenergized and the display
should flash “GF”, “triP” alternating and the Alarm should be
activated.
 If the Output relay does not trip, “FAIL” will flash on the
display and the Output relay will be forced off.
 To reset the Controller, press and hold the “DOWN” button
for 3 seconds.

NELSON™
INSTALLATION
CM-GP/AXPC100-CM-GP General Purpose Temperature ControllerINSTRUCTIONS
 TEL [phone]  www.nelsonheaters.com 
14251-001 Rev. 0
Sheet 9 of 10
November 2020
 To prevent electrical arcing and fire hazard, all cable connections and electrical wiring connections should be
sealed against moisture. This includes the use of proper cable sealing kits and the moisture proofing of all
wire connections.
 The metal sheath/braid of the heating cable must be connected to a suitable ground path before electrical
power is connected to this equipment.
 Isolate electrical power supply before opening or removing the Wire Cover.
 The enclosure cover must be secured with all screws provided to maintain the environmental ratings.
 The main components used in this connection system may present a hazard from static electricity. Only
surface cleaning with a damp cloth is acceptable.
 Routine maintenance is required to maintain compliance with health and safety legislation:
 Check that the cover gasket is in place and not damaged each time the enclosure is closed.
 Check that all cover screws are in place and secure each time the enclosure is closed.
 Check the security of all cable entries on a routine basis.
 Check that all electrical connections are tight and secure on a routine basis.
 Check for physical damage and replace as required.
 This connection system is designed for use in areas subject to normal industrial levels of vibration. They are
not designed for use in areas subject to intentional or extreme conditions of vibration.
GENERAL CONDITIONS OF SAFE USE

NEC®; NFPA 70: National Electrical Code®, International Electrical Code Series
CLASS - C481382 - TEMPERATURE-INDICATING AND REGULATING EQUIPMENT
Other than Appliance Type - Certified to US Standards
CLASS - C481302 - TEMPERATURE-INDICATING AND REGULATING EQUIPMENT
Other Than Appliance Type
CSA LR 021208
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's
website at www.nelsonheaters.com. Nelson is a trademark of the Appleton Group LLC (Heating Cable Systems), 2 Connecticut South Dr,
East Granby, CT, 06026. A division of Emerson Automation Solutions.
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