©2017 Nelson Heat Tracing Systems
GA2497 Rev.5
7.2.3
Heater ID
This selection allows for user defined Heater Identification.
It provides a unique, identifiable tag or label for each heater
circuit. The Heater Name allows up to 20 alphanumeric
characters which are entered one at a time from left
to right. The cursor indicates which character is being
selected. Press the [SELECT UP/DOWN] arrow keys to change
the character. Move to the nextcharacter by pressing [NEXT]
arrow. Press [ENTER] in the last character position to save
the
Heater ID.
1.
Display Mode: Advanced
2.
Range: 20 Characters
3.
Default: Blank
7.2.4
Manual Override
This selection sets the response of the heater circuit to the
Override inputs. The Override inputs respond to contact
closure.
If the Over ride is set to “Off”, the over ride inputs
are ignored
and control of the heater circuit operates
normally based on the
measured temperature and maintain
temperature setpoint. If
the Override is set to“On”, an
open contact on the Override
inputs forces the heater Off.
When the contact on the Override
input is closed, the heater
control resumes in normal manner.
1.
Display Mode: Advanced
2.
Range: On, Off
3.
Default: Off
7.2.5
Deadband
The Deadband is defined as the difference between the
setpoint temperature and the actual maximum temperature
that is ideally allowed in excess of the setpoint temperature.
Decreasing the deadband increases the temperature control
accuracy but also increases the heater switching frequency.
1.
Display Mode: Advanced
2.
Range: 1 C° to 5 C°, 1 F° to 10 F°
3.
Default: 2 C° or 5 F°
4.
Note: Deadband is disabled for Proportional Control
mode.
Control Type
This selection determines the type of control method
used
by the controller, either On-Off (Deadband) or
Proportional
Control. The On-Off control mode is available
for all heating
devices. Proportional Control mode is only
available for series type heating devices.
Warning:
Proportional Control should never be selected
for use with self-regulating heating cable types due to
the constantly changing characteristics of self-regulating
cables – this will cause the control to be unstable. Further,
the continual cycling associated with Proportional Control
can
result in internal heating of the cable and lead to
reduced
life expectancy.
5.
Display Mode: Advanced
6.
Range: On-Off, Proportional
7.
Default: On-Off
8.
Selection does not exist if Maintain Temperature is set
to Off.
7.2.6
Current Limiting
This selection sets the maximum average current limit
allowed for the heater circuit. It is useful for reducing the
power output of constant wattage heaters. The load will
be
turned on for a period of time and then turned off for a
period of time to maintain the average current draw to the
value set.
1.
Display Mode: Advanced
2.
Range: 0.5 to 30.0 A, Off
3.
Default: Off
4.
Note: The value range is in 0.5A increments.
7.2.7
Soft Start Mode
This function ramps the heater output from Off to nominal
current of the heater over the set soft start cycle time. It
is useful for reducing inrush currents of self-regulating
heaters. At the end of the soft start cycle time, the load will
no longer be controlled by the soft start function.
1.
Display: Advanced
2. Range: 10 to 999 seconds, Off
3.
Default: Off
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