KGL Operating Manual – VS 3010 BS
2018-07-02
/
66 178
Limitation of the starts
It is determined using the parameter Starts/h (menu 3-3) at which minimum time intervals a compressor can be
switched on. For example, if the switching frequency is 10 switching operations per hour, a compressor can be
switched on at the earliest every 6 minutes.
Compressor combined control:
Limiting compressor starts is deactivated in the respective circuit (Z1 or Z2).
Compressor step control:
Limiting compressor starts is always active.
: If there is only one capacity controlled compressor available in a circuit (Z1 or Z2), limiting
Exception
compressor starts is deactivated for this compressor in the respective circuit. This compressor is only
affected by Off Time S1.
Monitoring of the starts
With combined control, the starts monitoring is always active, with step control, it is always deactivated. In the
event that excessive starts result in the Z1 or Z2 circuit during compressor combined control. the message "too
many starts" is output if the starts specified using the parameter too many starts/h is exceeded in a circuit (Z1
or Z2). Possible causes for excessive starts could be: System error (e.g. motor overload cutout), compressor
too large, unfavourable control times or parameter settings in the pack controller (e.g. parameter too many
starts/h is set too small). The deactivated limiting compressor starts for compressor combined control is
activated again in the event of a Z1/Z2 frequency converter error. The error status of the frequency converter
(Z1 or Z2) is detected via the "the compressor motor overload cutout" digital inputs respective first compressor
in the circuit (Z1 or Z2).
Minimum Off Time S1
In the case of active compressor combined control (Z1 or Z2) or in the case of a mixed configuration of single-
stage and exactly one capacity-controlled compressor, the limiting compressor starts is replaced with minimum
Off Time S1. Using the parameter standstill S1 Z1/Z2 (menu 3-3), the time can be set that must elapse before
the first stage of the circuit Z1/Z2 can be loaded again after unloading. This prevents cycling of the first
compressor stage Z1/Z2 in the event of low partial load.
