MR ECOTAP VPD CONTROL PRO Operating Instructions Manual page 98

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98 ECOTAP VPD CONTROL PRO
The master handles voltage regulation and transmits its current tap positions
to all followers via the CAN bus. The followers compare the tap position re-
ceived with their own tap position. If the tap position is not the same, the fol-
lowers switch to the tap position received from the master. This ensures that
the transformers operating in parallel are always in the same tap position.
You can set whether the master transfers the change in tap position to the
followers before or after its own tap-change operation. The devices then ei-
ther change position sequentially (first the master, then the followers) or in
synch (master and followers at the same time).
If there is a tap difference between the master and followers, the master re-
frains from issuing any control commands to the motor-drive unit until all of
the followers have reached the same tap position. If the tap difference per-
sists for longer than the set delay time for parallel operation error messages,
the master triggers the Step difference to follower event.
You can explicitly designate the voltage regulators as master and followers,
or set automatic designation using the CAN bus address.
For the tap synchronization parallel operation method, you have to set the
following parameters:
Parameter
Activate parallel operation
Parallel operation method
CAN bus address
Circul. reactive current
blocking limit
Master/follower current
blocking
Master/follower switching
characteristics
Maximum tap difference
Error if no communication
present
Behavior if no communi-
cation present
Parallel operation error
delay time
Table 31: Parameter
Parameter
Activate parallel operation
Parallel operation method
CAN bus address
5252433/02 EN
Auto Master
Yes
Auto. tap syn- Master
chronization
Yes
Optional, if master/follower current blocking is active
Yes
Yes
Yes (if follower) No
Yes
Yes
Yes
Auto Master
Yes
Auto. tap syn- Master
chronization
Yes
Maschinenfabrik Reinhausen GmbH 2018
8 Operation
Follower
Follower
Yes
Follower
Follower