MR TAPCON 250 - Page 149

9 Operation
Maschinenfabrik Reinhausen GmbH 2022 1498595028/00 EN TAPCON
®
250
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 transmits 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 Auto Master Follower
Activating parallel opera-
tion
Yes
Parallel operation method Auto. tap sync. Master Follower
CAN bus address Yes
Circulating reactive cur-
rent blocking limit
Optional, if master/follower current blocking is active
Master/follower current
blocking
Yes
Master/follower switching
characteristics
Yes
Maximum tap difference Yes (if follower) No Yes
Error if no communication
present
Yes
Behavior if no communi-
cation present
Yes
Parallel operation error
delay time
Yes
Table42: Parameter