14.01.2019
67/185
•
Tripping of motor overload cut-out
•
Tripping of a high pressure switch
•
Exceeding the maximum permissible cylinder head temperature
In the event of any fault on any of the compressors that can be assigned to the frequency converter
(compressors 1 and 2), a compressor switch-off is performed and the generation of a signal depending on the
state of the base load rotation output (relay output "
FC compressor switching
compressor fault for single-stage compressors
For speed-controlled compressors, the frequency converter is always enabled with the first compressor
capacity stage. Using the base load rotation, compressor 1 or compressor 2 can be assigned to the FC. If no
base load rotation was performed (output base load rotation OFF), a fault of compressor 1 causes the switch-
off of the capacity stage 1 with the appropriate fault signal for compressor 1. A fault of compressor 2 results in
the switch-off of capacity stage 2 with the appropriate fault signal for compressor 2.
After any base load rotation (output base load rotation ON) a fault of compressor 1 causes the switch-off of the
capacity stage 2 with the appropriate fault signal for compressor 1.
A fault of compressor 2 results in the switch-off of capacity stage 1 with the appropriate fault signal for
compressor 2.
Fault on
Base load rotation output Capacity stage OFF output Message
Compressor 1 ON
Stage 2
Message C1
OFF
Stage 1
Compressor 2 ON
Stage 1
Message C2
OFF
Stage 2
Compressor fault for capacity-controlled compressors
For multi-stage compressors that are operated in combined control, the frequency converter is always enabled
with the first compressor relay stage and the motor of the first compressor is controlled. The following relay
stage(s) is/are used for actuation of the bypass valves of the first compressor.
In the case of combined control, compressor 1 or compressor 2 can be optionally assigned to the frequency
converter by the base load rotation. However, this means for base load rotation that, in addition to the
compressor base load stage, the associated compressor capacity stage(s) must also be changed over.
If no base load rotation is performed (base load rotation output OFF),a fault of compressor 1 causes the switch-
off of the capacity stage 1 (enable FC and control compressor motor C1) as well as the capacity stage 2
(compressor with two capacity stages) and - depending on configuration - the capacity stage 3 (compressor
with two capacity stages).
An appropriate fault signal for compressor 1 is also sent. The relay contacts for the base load and capacity
stage(s) of the second compressor, in the case of a configuration with capacity-controlled compressors, move
to stage
No.cap.stages
+ 1 and following.
A fault of compressor 2 results in the switch-off of the capacity stage (
No.cap.stages
+ 1 and following) with the
appropriate fault signal for compressor 2. After any base load rotation (output base load rotation ON) a fault of
compressor 1 causes the switch-off of the capacity stage (
No.cap.stages
+ 1 and following) with the appropriate
fault signal for compressor 1.
A fault of compressor 2 results in the switch-off of capacity stage 1 and following with the appropriate fault
signal for compressor 2.
Summary of Contents for VS 3015 C
Page 8: ...14 01 2019 8 185...
Page 46: ...14 01 2019 46 185...
