GOSSEN METRAWATT GMBH 29
Manual Operation with Binary Input
Switching to manual operation is possible via the binary input.
– Bumpless switching to manual operation with all controller sorts
– The last PWR is “frozen” for step-action controllers as well.
– The last switching status is retained for limit transducers.
– Operation and display are identical to automatic operation, except that the LED lights up and the PWR
can be changed in the PWR display with the and keys.
– When configured as a step-action controller (controller sort set to 2 through 5), the Y St parameter must be
set to 0.
– The “alarm 2” configuration digit must be set to a value of 8 ... F to this end (compare CnF2 on page 27)
PWR Out Offset with Binary Input
When configured as a step-action controller (controller sort set to 2 through 5), control quality can be
significantly improved by means of PWR out offset where abrupt load fluctuations prevail.
– When the contact at the binary input is closed, the controller’s PWR is increased by an amount equaling
YSt.
– It is reduced by the same value when the contact is opened.
– No function during self-tuning
–Where Y St = 0, the binary input activates manual operation (see above).
– The “alarm 2” configuration digit must be set to a value of 8 ... F to this end (see also CnF2 on page 27).
Example:
If a machine requires an average of 70% heating power during production operation, but only 10% during idle
time, the difference of Y ST is set to 60%, and the binary input is only activated during production.
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