Changing cycle mode (optional)
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HDK-CNG_EN_03_2016
►
With ATEX-compliant dryers:
Restore operational potential compensation, check electrical conductivity
and document the results.
Restart commissioning again.
Changing cycle mode (optional)
Which cycle modes can I choose?
After a successfully concluded initial commissioning process, with the option
dewpoint control
the dryer must be operated in economy mode (
Economy Cycle
).
Dryers equipped with dewpoint-sensing control operated in variable cycle
mode, based on the measured dewpoint of the dried air at the natural gas
outlet. As soon as a certain dewpoint is reached, as the drying agent in the
absorbing chamber is saturated, the chambers are switched. The dewpoint at
which a switchover is made is preset at the factory.
At the same time, at the changeover point to variable cycle, synchronous
compressor operation is enabled. Compressor synchronisation helps reduce
energy costs, as the dryer can be operated independently of the compressor.
As soon as the compressor is switched off, the dryer is automatically set to
standby mode. In standby mode, the control system remains on, and the
dryer is ready for the next switchover, which is made as soon as the
compressor is switched on.
The compressor synchronization controller is a higher-level controller than the
pressure dew point controller (see below). When both options are in place, the
compressor synchronisation controller is treated as the prime controller.
When should I change cycle mode?
Cycle changes should be made during the pressure build-up phase and prior to
switchover; during this phase, the pressure in both chambers is just below
operating pressure so that a fast pressure build-up is prevented when the
chambers are switched.
How do I change cycle mode?
► Wait until the dryer has reached the pressure build-up phase (phase prior to
switchover).
► Actuate the S1 switch. The selected driving mode is shown on the control
display. The driving mode shown in brackets is enabled.
The programme continues the cycle.