8 Operation
Maschinenfabrik Reinhausen GmbH 2018
98
5252433/02 EN
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
Auto
Master
Follower
Activate parallel operation
Yes
Parallel operation method
Auto. tap syn-
chronization
Master
Follower
CAN bus address
Yes
Circul. reactive current
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 31: Parameter
Parameter
Auto
Master
Follower
Activate parallel operation
Yes
Parallel operation method
Auto. tap syn-
chronization
Master
Follower
CAN bus address
Yes
Summary of Contents for ECOTAP VPD CONTROL PRO
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