Snow Melting SCPM Installation and Operation Manual

Snow Melting SCPM Installation and Operation Manual
Power Modulator
Snow/Ice Melting System Control Panel
Installation and Operating Manual
4007993
CONFORMS TO
UL STD 508A
CERTIFIED TO
CSA STD C22.2
NO. 14
Installation Support • (800) 875-5285 • www.WarmlyYours.com
Table of Contents
Sections:
page
1. Introduction ................................................................................................................................. 1
2. SCMZ Installation ........................................................................................................................ 2
2.1. Wiring the Power Modulator .......................................................................................................3
2.1.1 Wiring the Power Modulator 3 (SCPM-CO-120-3).................................................................3
2.1.2 Wiring the Power Modulator 5 (SCPM-CO-120-5)................................................................ 4
2.1.3 Wiring the Power Modulator 9 (SCPM-CO-120-9)................................................................ 5
2.2 SCPM-SS-120 Snow Sensor ........................................................................................................ 6
2.2.1. SCPM-SS-120 Snow Sensor Installation ............................................................................ 6
2.2.2. SCPM-SS-120 Snow Sensor connections to the system ...................................................... 7
3. Operating instructions ................................................................................................................... 8
Turning the system ON and OFF .................................................................................................. 8
Selecting temperature scale ........................................................................................................ 8
Selecting Automatic or Manual mode ......................................................................................... 8
Heaters indication ....................................................................................................................... 8
Snow flake icon and digital time indication ................................................................................. 8
4. Technician settings ......................................................................................................................... 9
4.1. Enter technician settings mode .................................................................................................. 9
P01 - Temperature set point ......................................................................................................... 9
P02 - Lower limit temperature for heating ....................................................................................10
P03 - Upper limit temperature for heating ....................................................................................10
P04 - Time delay before stopping the heaters ...............................................................................11
P05 - Manual mode ON time ........................................................................................................ 11
P06 - Heaters cycle and splitting time ...........................................................................................11
P07 - Heater outputs logic by Aerial Sensor or by WarmlyYours sensor ........................................12
P08 - Snow sensor sensitivity ........................................................................................................12
P88 - Snow detection threshold.....................................................................................................12
P09 - Number of snow sensors connected ....................................................................................12
P10 - Test conditions mode ...........................................................................................................13
Save changes and return to normal display ..................................................................................13
4.2. Restore default values ................................................................................................................13
4.3. Enable/Disable zones ..................................................................................................................13
4.4. DIP Switch settings ......................................................................................................................14
5. Troubleshooting................................................................................................................................15
5.1. Temperature reading errors .........................................................................................................15
5.2. Communication errors .................................................................................................................15
5.3. Wiring errors ................................................................................................................................16
Appendix 1 - Calibrating and testing the internal GFCI .................................................................17
Section 1
Introduction
The Power Modulator power box together with the Power Modulator controller and interface panel, offer smart and easy
control over the Snow & Ice Melting systems.
It can operate up to 4 snow melting zones and one auxiliary zone, with selectable sequencing method. Typical
applications include driveways, sidewalks, loading docks, stairs, pavement and gutters. The backlit LCD screen provides
full interface and information of the system status. The use of several zones staggering allows covering larger areas for
snow melting with limited available electrical power.
The Power Modulator controller offers various operating and programming options such as:
- Optional auxiliary control by WarmlyYours snow/ice sensor
- Switchable temperature scales (°F or °C)
(e.g. Gutter Sensor)
- Both Automatic and Manual modes
- Adjustable heaters cycle and splitting times
- Adjustable snow sensor sensitivity (%Rh)
- Adjustable heaters hold on, off & delay
- Commissioning/Test mode
- Energy saving upper temperature limit
- Adjustable Lower ambient temperature limit (lockout)
Assembly: cETLus listed - conforms to UL STD 508A, certified to CSA STD C22.2 No. 14
Enclosure: UL, CSA, TUV listed
General system layout with Power Modulator
Power Modulator
controller
Optional WarmlyYours snow/ice sensor
(e.g. Gutter or Air sensor)
Snow & Ice sensor/
sensors SCPM-SS-120
#4
#3
#2
#1
(Optional)
Upper limit sensor
SCPM-CO-120-RP-ULS
SCPM-CO-120-3
SCPM-CO-120-5
SCPM-CO-120-9
1
Zone
1
Zone
2
Zone
3
Zone Auxiliary control
4 (e.g. Gutter or
Pavement heaters)
Power Modulator Installation
Section 2
PLEASE READ THIS MANUAL AND THE SAFETY WARNINGS CAREFULLY BEFORE INSTALLING AND
USING THE CONTROLLER AND SAVE IT FOR FUTURE USE
Installation notes
• Familiarize yourself with markings, warnings, components and terminology.
• The Power Modulator power boxes and its accessories must be installed by a qualified electrician in
accordance with local regulations and the requirements of the NEC (NFPA 72 ) and the CEC part 1.
• WARNING: Ensure the power is disconnect from all circuits before mounting the power box and
making any connections. Contact with components carrying hazardous voltage can cause electric
shock and may result in severe personal injury or death.
• Installer must ensure the installation of approved disconnect means for all power supply
circuits feeding this unit.
• The power boxes are suitable for indoor wall mount installation only.
• Ensure wiring according to the provided schematics using copper conductors only.
• Make sure the wire gauge (AWG) is suitable for the circuit amperage draw, as specified in the NEC/
CEC table 1.
• Ensure that the main breakers (fuses) are suitable for the heating systems rating (80% load).
• Grounding means must comply with local regulations and CEC/NEC.
• Ensure that the heating system/de-icing system connected to this unit complies with the UL 499 or UL
515 & CSA 22.2 # 130.3 standard and is certified / listed by an NRTL.
• Ensure that all wiring is rated for the application at 60°C (140°F as per UL 515 CSA 22.2 #130 clause
12 table 12.1.
• Ensure that any holes punched for conduit do not compromise the integrity of the enclosure ratings.
Ground fault circuit interrupter (GFCI)
• The ground fault interrupter/residual current detector installed in this system is a Non class A GFCI,
intended for equipment protection.
• Familiarize yourself with its operation and required setting.
• At installation and commissioning stage, use a calibrated milliamp meter to read and record the
heating systems natural leakage.
• Set the GFI/RCD to no more than 30 milliamps higher than that reading.
• This step might have to be repeated a few times, to avoid nuisance tripping.
• The GFCI should be tested monthly. Please refer to the calibration and testing instructions in
appendix 1 of this manual.
2
2.1. Wiring the Power Modulator
2.1.1 Wiring the Power Modulator 3 (SCPM-CO-120-3)
Heater load connection
Provide contactors C1, C2, C3 and C4 with up to 300 VAC, 30 AMP.
Make sure the wire Gauge (AWG) is suitable for the circuit Amperage draw, as specified in the NEC/
CEC table 1.
Main supply for the power box
Provide terminals L1, N1 with 120 VAC supply.
Caution: Incorrect voltage may cause fire or seriously damage the unit.
Connection to aerial snow sensor (SCPM-SS-120)
Please refer SCPM-SS-120 installation section of this manual.
Connection to WarmlyYours ice&snow sensor (AIR-SS / GTR-SS) - option 3-wire shielded
cable Up to 2,000 ft (609 m) using 12 AWG 3-wire shielded cable.
Up to 500 ft (152 m) using 18 AWG 3-wire shielded cable.
GFCI
1
2
Internal connections
IN
IN
Transformer
130VA
120/24VAC
C.T (Current Transformer)
Internal connections
L1 N1
F-5A
C R 1 2 C C R A B R
R
Branch circuit protection
and disconnect provided
by installer. Max. 60A
See
Appendix 1
Heater load connection
300 VAC max.
30 AMP max.
Main
supply
120 VAC
WarmlyYours Upper limit
ice&snow temp. sensor
sensor
(option)
Important!
If the heaters are connected in star, the neutral must pass through the
internal current transformer and the external Branch circuit protection.
3
SCPM-SS-120
Snow sensor
SCPM-CO-120-RP-ULS
2.1.2 Wiring the Power Modulator 5 (SCPM-CO-120-5)
Heater load connection
Provide 3-Phase contactors C1, C2, C3 and C4 with up to 600 VAC, 50 AMP Maximum per pole.
Provide contactor C5 with with up to 300 VAC, 30 AMP.
Make sure the wire gauge (AWG) is suitable for the circuit Amperage draw, as specified in the NEC/
CEC table 1.
Main supply for the power box
Provide terminals L1, N1 with 120 VAC supply.
Caution: Incorrect voltage may cause fire or seriously damage the unit.
Connection to aerial snow sensor (SCPM-SS-120)
Please refer snow sensor installation section of this manual.
Connection to WarmlyYours ice&snow sensor (AIR-SS / GTR-SS) - option 3-wire shielded
cable Up to 2,000 ft (609 m) using 12 AWG 3-wire shielded cable.
Up to 500 ft (152 m) using 18 AWG 3-wire shielded cable.
Branch circuit protection and disconnect
provided by installer
Max. 60A
Transformer
130VA
120/24VAC
Current Transformer
1
2
Internal connections
GFCI
IN
IN
Internal connections
L1 N1
12
F-5A
C R 1 2 C C R A B R
R
A1
B C1 A
B1
C
A1
B C1 A
B1
C
A1
B C1 A
B1
C
A1
B1
C
See
B C1 A
L1,L2,L3 - 600 VAC max.
50 AMP max. per pole
Heater load connection
Appendix 1
300 VAC max.
30 AMP max.
Important!
If the heaters are connected in star, the neutral
must pass through the internal current transformer
ring and the external branch circuit protection.
Main
supply
120 VAC
WarmlyYours
SCPM-SS-120
ice&snow Upper limit
Snow sensor
sensor
temp. sensor
(option)
SCPM-CO-120-RP-ULS
4
2.1.3 Wiring the Power Modulator 9 (SCPM-CO-120-9)
Heater load connection
Provide contactors C1, C2, C3 ... C9 with up to 277VAC MAX, 30 AMP.
Make sure the wire Gauge (AWG) is suitable for the circuit Amperage draw, as specified in the
NEC/CEC table 1.
Main supply for the power box
Provide terminals L1, N1 with 120 VAC supply.
Caution: Incorrect voltage may cause fire or seriously damage the unit.
Connection to aerial snow sensor (SCPM-SS-120)
Please refer SCPM-SS-120 installation section of this manual.
Connection to WarmlyYours ice & snow sensor (AIR-SS / GTR-SS) - option 3-wire
shielded cable up to 2,000 ft (609 m) using 12 AWG 3-wire shielded cable.
Up to 500 ft (152 m) using 18 AWG 3-wire shielded cable.
5
2.2. SCPM-SS-120 Snow Sensor
2.2.1. SCPM-SS-120 Snow sensors installation
Choose an unobstructed, elevated location exposed to snowfall.
Mounting
The snow sensors will be installed outdoors.
There are two ways to install the aerial sensors:
1. Mounting on SCPM-WM-120 metal holder (available separately)
2. Mounting on a vertical pole NPT ½'' Thread
1. Mounting on SCPM-WM-120 metal holder
The SCPM-SS-120 fits precisely to the round surface and the holes are
located on the metal ring to secure the Snow sensor assembly.
Adjusting the arm length is easy and done using the top screw. The
rectangular holes along the arm provide easy holding points for tie
wraps, securing the cable of the SCPM-SS-120. An opening in the wall
plate provides a direct access to feed the wire into the house.
SCPM-SS-120
SCPM-WM-120
2. Mounting on a vertical pole
Mount sensor rigidly, in plumb upright position, as shown. Mount sensor at height necessary to discourage damage and
vandalism.
Moisture sensor protection cap
(Remove during snow season)
Conduit Body (or Weatherproof
Junction Box) and rigid conduit
supplied by the installer
6
Moisture Sensor. Place
snow, ice or water on this
area when testing.
1/2” (16mm) NPT
Female Threaded Nipple
Note: Sensor wire must remain separate from any high voltage wire to avoid a distorted sensor signal.
For proper operation, the moisture sensor protection cap must be removed.
2.2.2. SCPM-SS-120 Snow sensors connection to the system
The system can be configured to operate with 1, 2, 3 or 4 snow sensors.
Each snow sensors must have different MAC address in order to communicate with the main board.
The SCPM-SS-120 snow sensors series includes 4 different part numbers, each is factory preconfigured with unique MAC address as follows:
SCPM-SS-120
MAC Address 1
SCPM-SS-120-2
MAC Address 2
SCPM-SS-120-3
MAC Address 3
SCPM-SS-120-4
MAC Address 4
When connecting more than one sensor, snow sensor 1 must be connected last in communication line.
SCPM-SS-120
#3 (Zone #3)
SCPM-SS-120
#4 (Zone #4)
SYSTEM
A,B
R,C
A,B
R,C
SCPM-SS-120
#2 (Zone #2)
A,B
R,C
The snow sensors will control zone upon
the following logic:
Connecting 3 snow sensors
Snow sensor 1 will control zone 1.
Snow sensor 2 will control zone 2.
Snow sensor 3 will control zone 3
(and zone 4 as an option)
Connecting 4 snow sensors
Snow sensor 1 will control zone 1.
Snow sensor 2 will control zone 2.
Snow sensor 3 will control zone 3.
Snow sensor 4 will control zone 4
A,B
R,C
SCPM-SS-120
Connecting 1 snow sensor
The snow sensor will control all 3 zones
(and zone 4 as an option)
Connecting 2 snow sensors
Snow sensor 1 will control zones 1 and 2.
Snow sensor 2 will control zones 3
(and zone 4 as an option)
SCPM-SS-120
#1 (Zone #1)
1/2” NPT
JBOX and Conduits
(supplied by installer)
Cable length from
SCPM-SS-120 3.28 ft/1 m
A
R
C
Shield
A
B
R
C
B
Shield
Shield
A
B
R
C
Communication cable (A,B)
Jacketed shielded twisted pair, 120 Ohm, 18AWG
Up to 500 ft / 150 m
Power cable (R,C)
18AWG - Up to 500 ft / 150 m, 12AWG – Up to 1000 ft / 300 m
Notes:
- The number of snow sensors connected must be configured in section P09 of the technician settings.
- When one of the snow sensors cannot be viewed through communication (faulty or not connected),
the values on snow sensor 1 will be used instead.
- After installing the aerial sensor, take the top-middle white cap off.
7
Operating instructions
Green POWER lamp
Section 3
Red GROUND FAULT RESET lamp and button
The green power lamp on the metal
The red GROUND FAULT RESET lamp on the metal
power box will light when power is
power box will lit when the internal GFCI is tripped.
supplied to the unit (120 VAC)
Press and hold the GROUND FAULT RESET button
Turning the system ON and OFF
Press and hold the [ON] button on the controller for
0.5 seconds to turn the system ON or OFF.
The words “ON” or “OFF” will appear on display.
for 5 seconds to reset the unit.
Selecting temperature scale
Press the [+] button for Celsius.
Press the [-] button for Fahrenheit.
Selecting Automatic or Manual mode
Press the [SELECT] button to switch between modes:
“Automatic”
Heating will start and stop automatically depending on snow detection by the
snow sensor/sensors.
“Manual ON”
Heating will start regardless of snow sensor measurements and will stop after a
preset time (pls. refer to the “Manual ON” section in the technician settings P05).
Note: Mode will always return to “Automatic” after switching the unit OFF and ON.
Heaters indication
The number beneath the heater icon indicate the heater stage (1 to 5).
Stg. Stg. Stg. Stg. Stg.
1
2
3
4
5
Black icon – Heater ON
White icon – Heater OFF
Heater ON
Heater OFF
Snow flake icon and digital time indication
A solid snow flake icon will appear on display while sensing snow and during normal
heaters operation.
A blinking snow flake icon will appear on display during heaters off delay or when manual mode is
activated. The digital clock will count down the remaining time until the heaters are turned off.
The snow flake icon will disappear from display as long as the heaters are turned off.
8
Section 4
Technician settings
Use the technician settings mode to view and adjust the following parameters:
P01
P02
P03
P04
P05
Temperature set point
Lower ambient temperature limit to stop
heater activation
Energy saving, upper slab temperature
limit to stop heater operation
Time delay before stopping the heaters
ON time for manual mode
P06
P07
P08
P88
P09
P10
Heaters cycle time / Splitting time
Sensors and heaters control logic
Snow sensor sensitivity
Snow detection threshold
Number of snow sensors connected
Commissioning / Test mode
4.1. Enter technician settings mode
Move DIP switch S1 located on the side of thermostat to ON position.
Press the [SELECT] and [+] buttons simultaneously to move forward to the next
technician parameter.
Press the [SELECT] and [-] buttons simultaneously to return to the previous
technician parameter.
Enter technician
settings mode
Save changes and exit technician settings mode
Move DIP switch S1 located on the side of thermostat to OFF position.
Important: Changes made to technician parameters will not take effect as
long as DIP switch S1 is in ON position.
Save changes
and exit
technician
settings mode
Parameters:
P01 - Temperature set point
Move DIP switch S1 located on the side of thermostat to ON position to
enter technician settings mode.
“P01” and the temperature set point will appear on display.
Use the [+] and [-] buttons to adjust the temperature set point.
Snow
Range: 19…45°F / -7…+7°C
detector
As long as the ambient temperature is lower
than the temperature set point P01, the
Ambient
temperature
controller will turn ON upon receiving a
sensor
positive snow signal from the snow detector.
9
Temperature
set point
P02 - Lower limit temperature for heating
Press the [SELECT] and [+] buttons simultaneously.
“P02” and the low limit temperature will appear on display.
When the temperature on the temperature sensor drops below the low
temperature limit, the heating system will stop.
Use the [+] and [-] buttons to adjust the temperature set point.
Range: -4…+23°F / -20…-5°C
Default: -5°F / -20°C
Press the [SELECT] and [+] buttons simultaneously again.
The word “ON” or “OFF” will appear on display.
Use the [+] and [-] buttons enable (ON) or disable (OFF) the P02
parameter.
If disabled, the heating system will operate without low temperature
limitations.
Low limit
Temperature
P02
enabled
P02
disabled
P03 – Upper limit temperature for heating
Press the [SELECT] and [+] buttons simultaneously.
“P03” and the slab upper limit temperature will appear on display.
Use the [+] and [-] buttons to adjust the upper limit temperature.
Range: +41…+86°F / +5…+30°C Default: 86°F / +30°C
Press the [SELECT] and [+] buttons simultaneously again.
The word “ON” or “OFF” will appear on display.
Use the [+] and [-] buttons enable (ON) or disable (OFF) the P03
parameter.
If disabled, the heaters will work regardless of the upper limit.
Press the [SELECT] and [+] buttons simultaneously again.
The display will show the temperature on the upper limit sensor.
Upper limit
temperature
Set point
enabled
P03
disabled
temperature
on heaters
sensor
10
P04 -Time delay before stopping the heaters
Press the [SELECT] and [+] buttons simultaneously.
“P04”, “dL” and the time delay before stopping the heaters (Hold ON) will
appear on display. The hours will blink.
Use the [+] and [-] buttons to adjust the hours of the time delay.
Range: 00...99 hours
Default: 00 hours
Press the [SELECT] and [+] buttons simultaneously again.
The minutes will blink.
Use the [+] and [-] buttons to adjust the minutes of the time delay.
Range: 00...59 minutes
Default: 30 minutes
Note 1. The time delay countdown will start when the snow detection signal
from snow sensor will switch from positive to negative.
Note 2. The staggering sequence will continue during the time delay period.
P05 - Manual mode ON time
Press the [SELECT] and [+] buttons simultaneously.
“P05”, “On” and the “Manual ON” mode time period will appear on display.
The hours will blink.
The delay time parameter defines a time frame in which the heaters remain
ON after receiving an “Manual ON” command.
Use the [+] and [-] buttons to adjust the hours of the working time.
Range: 00...99 hours
Default: 6 hours
Press the [SELECT] and [+] buttons simultaneously again.
The minutes will blink.
Use the [+] and [-] buttons to adjust the minutes of the working time.
Range: 00...59 minutes
Default: 00 minutes
P06 – Heaters cycle and splitting time
Press the [SELECT] and [+] buttons simultaneously.
“P06”, “SP” and the splitting time will appear on display.
The minutes will blink.
The heaters cycle / splitting time parameter defines the working time of the
heaters when working in sequence.
Example: the splitting time is set to 10 minutes and 4 heaters work in
sequence, each heater will be ON for 2.5 minutes (10/4=2.5).
Use the [+] and [-] buttons to adjust the splitting time.
Range: 10...1999 minutes
Default: 24 minutes.
11
Time delay
hours
Time delay
minutes
Manual ON
hours
Manual ON
minutes
Splitting time
P07 - Heaters outputs logic controlled by SCPM-SS-120 snow melt sensor or by WarmlyYours sensor
SCPM-SS-120
Outputs 1,2,3 and 5
Press the [SELECT] and [+] buttons simultaneously.
“P07” and the figures “0”, “1”, “2” or “3” will appear on display.
Use the [+] and [-] buttons to define the heaters logic (model dependent) as follows:
Value
Outputs controlled by
SCPM-SS-120
Outputs controlled by
WarmlyYours sensor
0
All outputs
-
1
1,2,3
5
2
-
All outputs
3
Comments
Default
The display will not show the ambient
temperature and will remain blank.
Same as 1
Note: WarmlyYours sensors - i.e. gutter or air sensors – GTR-SS, AIR-SS
P08 - SCPM-SS-120 Snow sensor sensitivity
Press the [SELECT] and [+] buttons simultaneously.
“P08” and the snow sensor sensitivity value will appear on display.
Use the [+] and [-] buttons to adjust the sensitivity.
Range: 20...80 % (20% - Less sensitive, 80% - more sensitive), Default: 50 %
P88 - SCMZ-SS-120 Snow detection threshold
Press the [SELECT] and [+] buttons simultaneously.
“P88” and the snow sensor threshold will appear on display.
Use the [+] and [-] buttons to adjust the threshold.
Range: 00...60 minutes
Default: 5 minutes
If the threshold is not reached, the logic of turning the heaters either ON or OFF will
not be affected by snow detection.
During countdown to threshold time, the snow flake icon will flash.
Snow sensor
sensitivity
Snow detection
threshold
P09 – Number of snow sensors connected
Press the [SELECT] and [+] buttons simultaneously.
“P09” and the number of snow sensors connected will appear on display.
Use the [+] and [-] buttons to select 1, 2, 3 or 4 snow sensors. Default: 1
Number of
snow sensors
12
P10 - Test conditions mode / Technician commissioning mode
Turn ON test conditions to check the functionality of the system regardless of sensors'
parameters (i.e. during the summer).
In test conditions, the Ambient temperature is always -5°C/23°F.
Note: In order to trigger the system and activate the heaters, use some water to wet the
circuit on top of the snow sensor.
Press the [SELECT] and [+] buttons simultaneously.
“P10” will appear on display. The hours will blink.
Use the [+] button to enter test/commissioning mode – “Test” will appear on display.
Use the [+] button to manually exit test/commissioning mode – “Test” will disappear
from display.
Note: If the technician does not manually exit test/commissioning mode,
the unit will automatically return to normal mode after 5 hours.
Save changes and return to normal display
Test
conditions
mode
Save changes
and return to
normal display
In order to save changes and return to normal display,
move DIP switch S1 back to OFF position.
4.2. Restore default values
Move DIP switch S1 to ON position.
Press and hold the [ON] button for 10 seconds. The thermostat will beep.
Move DIP switch S1 back to OFF position.
4.3. Enable/Disable zones
Turn the unit OFF.
While OFF, press both the [+] and [-] buttons simultaneously for 10 seconds.
Press the [Select] button to select zone. Selected zone will flash.
Press the [+] and [-] buttons enable/disable the selected zone.
Disabled
Black icon and “ON” on LCD - Enabled zone.
zone
White icon and “OFF” on LCD - Disable zone.
Press and hold the [+] and [-] buttons simultaneously for 5 seconds to exit.
Selected
zone
Note: Disabled zones will be ignored in splitting time calculations:
Example: the splitting time is set to 60 minutes and heaters are set work in sequence.
3 Heaters enabled and 1 heater disabled.
With all heaters enabled: Each heater will be ON for 15 minutes (60/4=15).
With 3 heaters enabled and 1 heater disabled: Each heater will be ON for 20 minutes (60/3=20).
13
Enabled
zone
4.4. DIP Switches settings
DIP switch S2 - Short measuring times (test only)
Use DIP switch S2 to shorten the measuring times as follows:
- “ON” - Shorten measuring times – for test/commissioning only (measuring times
will be divided to 60).
Short measuring
times (test)
- “OFF” - Normal operation.
Shorten measuring times:
A real 1 hour will take 1 minute and a real 1 minute will take 1 second.
DIP switches S3 and S4 – heaters sequencing logic
Normal operation
Use DIP switches S3 and S4 to define the sequencing logic of the heater (zones) as follows:
S3 OFF, S4 OFF
All 4 outputs work per request from the snow sensor(s)
S3 OFF, S4 ON
Outputs 1+3 and outputs 2+4 work together (according to splitting time)
Note: Do not use this configuration with more than two snow sensors connected.
S3 ON, S4 OFF
Outputs 1,2 and 3 work in sequence (according to splitting time) and output 4
works continuously.
Note: Do not use this configuration with more than two snow sensors connected.
S3 ON,
S4 ON
All 4 outputs work in sequence (according to splitting time)
Note: Do not use this configuration with more than two snow sensors connected.
Notes:
1. The illustrations above show the heaters operation for the SCPM-CO-120-3/5.
2. Heater 5, will be activated with or without heater 4, depending on the “Heaters output
logic” parameter set in section P07.
3. The logic will ignore disabled zone
14
Troubleshooting
Section 5
5.1. Temperature reading errors
Ambient temperature sensor readings (on snow sensor)
are out of reliable measuring range
Ambient temperature < -9°F/-23°C
Ambient temperature > 54°F/12°C
The system will continue to operate using constant predefined values.
In addition, the display will alternate between “LO” and -11°F/-24°C
for low temperature readings, and between “HI” and 55°F/13°C for
high temperature readings.
5.2. Communication errors
Error 1 – Communication error with one (or more) snow sensors
“SensErr 1” Will appear on display.
If the system is configured to work with more than 1 snow sensor, the faulty
snow sensor number will appear on display: P01, P02, P03 or P04.
The system will use readings from snow sensor 1 instead of the missing
readings from the faulty snow sensor.
Communication
error with snow
sensors
Error 2 – Upper limit temperature sensor is not connected or short circuit
“SensErr 2” Will appear on display.
The system will continue to operate regardless of the upper limit temperature.
Upper limit
temperature
Sensor error
Required actions:
1.. Refer to P03 section of the technician settings.
2.. Check the temperature value and disable the sensor if needed.
3.. Disconnect the sensor and test it (ohms reading), acceptable range is +/- 10,000 Ohms
depending on temperature.
4. If the sensor is damaged, replace the sensor
15
5.3. Wiring errors
Power light OFF, display OFF
- Verify 120 Vac between L1 and N1.
Power light ON, display OFF
- Reinstall connections at rear of the controller
- Verify 24 Vac between terminals R and C (top two terminals, back side of the SCPM controller)
- If 24 Vac is present between terminals R and C, then the controller is faulty
- If there is 120 Vac on terminals L1 and N1, and 0 Vac between R and C, remove and test the
fuse in the black casing with a digital ohm meter-FUSE T2AL250V (2 Amp, 250V – small glass fuse)
GROUND FAULT RESET light is ON
- Verify GFS (Ground Fault Sensor) is set for 30 mA.
- Press Ground Fault Reset button for 3 seconds.
- If the light is still ON – disconnect the load wires and press the Ground Fault Reset button for 3
seconds.
- If the light is still ON – check the connections between the inside GFI test button and the Ground
Fault Sensor.
- Re-connect load wires one-by-one, until GFR light comes on. Test offending wire with Digital Multimeter or Mega Ohm-meter.
CONTACTORS ARE ACTUATING, BUT CABLES DON’T HEAT
- Test for amp draw on the load wires with a clamp amp meter.
- If there is no amp draw, verify 120 Vac or 240 Vac is present at the top of the wire terminals of
the zone that is calling for heat (Terminals H11-H25)
- Verify proper ohms readings of affected heating cables
CONTROLLER SHOWS THE ZONES ARE SWITCHING, BUT THE CONTACTORS ARE NOT
ACTUATING
- Verify 24 Vac between the red and the white wire attached to the coil of the contactor, found on
the left and right side of the contactor.
- If 24 Vac is NOT present, verify 24 Vac on brown wires exiting green power transformer.
- Verify connection between wire and its connector.
16
Appendix 1
Calibrating and testing the internal GFCI
The GFCI (ground fault circuit interrupter) is designed to provide protection for electrical equipment.
The “ON” Time Delay and Current Trip should be configured to match application requirements.
2
“ON” Time delay
DANGER
HIGH VOLTAGE
(Default: Minimum time delay)
GROUND
FAULT
SENSOR
40
MIN
50
60
MAX
70
COM
Counter-clockwise to decrease
NO
Remote C.T.
80
30
Tripped relay LED indicator
TRIPPED
Current Trip - % full scale
(model dependent – see table)
SUPPLY
NC
Turn clockwise to increase
TIME
DELAY
1
20
90
10
100
CURRENT TRIP
% FULL SCALE
(Default: 30%)
Indicator (%)
10
20
30
40
50
60
70
80
90
100
17
Current trip (mAmps)
SCMZ controller
10
20
30
40
50
60
70
80
90
100
GFCI TEST
The GFCI should be tested monthly.
Press the red GFCI TEST button
located next to the R,C terminals
inside the box for 3 seconds to trip the
outlet and break the circuit. The RED
internal LED on the GFCI and the
RED external lamp on the box door
should lit. Press the RESET GFCI
button on the box door for 5 seconds
to return to normal operation and
reestablish power and protection.
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