Holdback feature as used in a ramp/dwell programmer controller.
A programmer controller is capable of having multiple ramp/dwell/ramp/...
segments. However, the furnace might not be capable of following the program
due to heater capacity, loading, and thermal lags. Eurotherm provides a
feature so that the customer can determine how much the furnace will be
permitted to deviate from the ramp/dwell program before the program is
put into "hold" and it waits for the furnace to catch up. This feature
is called "holdback" and it is available as a number above the program,
below the program, or as a deviation band around the program.
Some customers may refer to this feature as a guaranteed soak capability.
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