CM-2201/CM-2202
Programming
©2018 Nelson Heat Tracing Systems
www.nelsonheaters.com
GA2497 Rev.6
9
7.1
Program-Setpoints
7.1.1
Setpoint Value
This message displays the name of the sub-menu when
entered.
1.
Display Mode: All
2.
Range: N/A
3.
Default: N/A
7.1.2
Maintain Temp
This value sets the control setpoint temperature for
all operating modes. For On-Off control, the circuit is
energized if the control temperature is less than the
maintain temperature minus the deadband. The circuit
is de-energized if the control temperature is
greater than the maintain temperature plus the
deadband. If maintain temp is set to None then the
heater circuit will have temperature monitoring with no
control temperature. If the maintain temp is set to Off
then the heater circuit will have no temperature
monitoring or control.
1.
Display Mode: All
2.
Range: -50 to 500°C, none or -58°F to 932°F,
none, Off
3.
Default: 10° or 50°F
7.1.3
Low Temp Alarm
This value sets the Low Temperature Alarm setpoint. It must
be less than the maintain temperature minus the Deadband.
To disable this alarm set the value to “Off’. When the
measured temperature of either RTDA or RTD
B (if
activated) is less than or equal to this setpoint, the
Low Temperature Alarm is activated and a “LOW TEMP
ALARM” message is added to the alarm stack. This alarm
deactivates when the temperature rises above the alarm
setpoint value.
1.
Display Mode: All
2.
Range: -50C to Maintain Temperature, Off, -58°F to
Maintain Temperature, Off
3.
Default: 5°C or 41°F
4.
Restrictions: Message does not exist if Maintain
Temperature is set to Off.
7.1.4
High Temp Alarm
This value sets the High Temperature Alarm setpoint.
It must be greater than the maintain temperature plus
deadband. To disable this alarm set the value to
“Off”
When the measured temperature of either RTDA or RTDB
(if activated) is greater than or equal to this setpoint, the
High Temperature Alarm is activated and a “HIGH TEMP
ALARM” message is added to the alarm stack. The alarm
deactivates when the temperature falls below this alarm
setpoint.
1.
Display Mode: All
2.
Range: Maintain Temperature to +500°C,
Off, Maintain Temperature to +932°F, Off
3.
Default: Off
4.
Restrictions: Message does not exist if
Maintain Temperature is set to Off.
7.1.5
Low Current Alarm
This value sets the Low Current Alarm setpoint. It must
be less than the high current alarm setpoint. To disable
this alarm set the value to “Off’. When the heater current
is less than or equal to this setpoint, the Low Current
Alarm is activated and a “LOW CURRENT ALARM”
message is added to the alarm stack. The alarm
deactivates when the Heater Current rises above this
alarm setpoint. Note: This setpoint is based on the
heater at 100% power. If Proportional Control or
Current Limiting is enabled, all current measurements
will be scaled to 100% power, based on a constant
resistive load, before being compared to the alarm
setpoint.
1.
Display Mode: All
2.
Range: 0.1A to High Current Alarm value, Off
3.
Default: Off
