GOSSEN-METRAWATT GMBH 19
Manual mode with binary input 2
The controller can be switched to manual operation with binary input 2.
This is distinguished from the Off / manual mode with the key.
– Bumpless change-over to manual mode for all controller types.
– The last regulation ratio is „frozen“ also on switching controllers.
– With limit monitor, the last switching state is maintained.
– Operation and display are the same as in automatic mode with the exception that the LED lights and the regulation ratio in the display can be
changed with the rotary knob.
– Parameter Y St must be set to 0 during configuration as a discontinuous or a continuous action controller (controller types 2 through 5).
Feedforward control with binary input 2
During configuration as a discontinuous or a continuous action controller (controller types 2 through 5), control quality can be markedly improved by
means of feedforward control if large, sudden load changes occur.
– When the contact at binary input 2 is closed, the extent of regulation provided by the controller is increased by value Y St.
– If the contact is opened, this value is reduced by the same amount again.
– No function when self-optimization is activated
– If Y St is set to 0, binary input 2 activates manual operation, (see above).
Example: If a heating unit in a machine needs to be run at an average of 70% power during production, but only at 10% during idle-time, differential
value Y ST is set to 60%, and binary input 2 is only activated during production.
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