Emerson NELSON HEAT TRACE CM-2201 - Setpoints

CM-2201/CM-2202
Programming
©2017 Nelson Heat Tracing Systems
www.nelsonheaters.com
GA2497 Rev.5
7.1 Programming
7.2 Program-Setpoints
7.2.1 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
7.2.2 Maintain Temp
This value sets the control setpoint temperature for all
operating modes. For On-Offcontrol, 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
7.2.3 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 isset to Off.
7.2.4 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 set point, 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 set point.
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 isset to Off.
7.2.5 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 abovethis alarmsetpoint. Note: This set point
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, Off
3. Default: Off
7.2.6 High Current Alarm
This value sets the High Current Alarm setpoint. It must be
greater than the low current alarm setpoint. To disable this
alarm set the value to “Off’. When the heater current is
greater than or equal to this setpoint, the High Current Alarm
is activated and a “HIGH CURRENT ALARM” message is
added to the alarm stack. The alarm deactivates when the
heater current falls below this alarm set point. This setpoint
is based on the heater at 100% power.