CM-2201/CM-2202
Programming
©201
7
Nelson Heat Tracing Systems
www.nelsonheaters.com
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
O
verride
inputs
forces
the
heater
Off
. When
the contact
on
the
O
verride
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: Deadbandis disabledfor 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.
I
t
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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