Holdback - Carbolite Gero 3508 Installation, Operation And Maintenance Instructions

3.0 3508 Controller
1. With 'End' segment set to S.OP the power to the elements is turned down to 0%,
no matter what the 'Setpoint' temperature is.
2. With 'End' segment set to 'Reset' and the 'Setpoint' temperature turned down to
zero, power to the elements will be 0%. To do this set the 'Setpoint' temperature
to the minimum possible. For type B thermocouples this will be below zero.
3. With the 'End' segment set to 'Reset'. The controller will try to reach and maintain
the 'Setpoint' temperature in place before the program started.
4. With the 'End' segment set to 'Dwell'. The controller will dwell at the 'PSP' of the
last segment ("RUN" indicator flashes), until it is reset.
To reduce the number of segments in a program, change the last required segment to
an 'End' type.
You will be asked to press
To cancel all segments in a program, change the first segment to an 'End' type.
To alter parameters or segments of an operating program, this program must be held
or reset. Press RUN/ HOLD to pause the program, or press RUN/ HOLD for 2 seconds to
reset.
3.8.2

Holdback

Holdback can be used to prevent the program from operating ahead of the actual
heating or cooling.
The holdback value is the amount, in degrees, by which the program setpoint can run
ahead of the measured temperature before holdback operates. The value applies to a
whole program.
To set the value press page
press up or down
Holdback can be used in 'Rate', 'Time' and 'Step' segments.
• For 'Rate' and 'Time' segments holdback will operate during the segment.
• For a 'Step' segment holdback delays continuation to the next segment until the step
target is reached.
The 'Holdback Type' can be set as follows:
• Low Applies to heating only
• High Applies to cooling only
• Band Applies to both heating and cooling
• Off Holdback is switched off
To set the holdback type, press page
shows 'Holdback Type' for each segment and press up
The default setting for holdback is 'OFF'.
14
to cancel or
twice, press scroll
to set.
twice, then press scroll
for OK.
until 'Holdback Value' appears and
or down
until the display
to set.