CM-2201/CM-2202
Programming
©201
7
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
Temperatureissetto 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
Temperatureissetto 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
1
00% 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
set
p
oint.
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.
