6 Functions and settings
Maschinenfabrik Reinhausen GmbH 2016
111
5163667/00 EN
TRAFOGUARD® ISM®
Setting the circulating reactive current blocking limit
You can use this parameter to set the limit value for the maximum permissi-
ble circulating reactive current. This value relates to the rated current of the
current transformer. If, during parallel operation, the circulating reactive cur-
rent exceeds the set limit value, the device triggers the
Circulating reactive
current blocking limit exceeded
event. All devices operating in the parallel
operation group are blocked.
To set the circulating reactive current blocking limit, proceed as follows:
1.
Go to
Settings > Parameters >
Parallel operation > Circulating reac-
tive current blocking limit
.
2.
Enter the circulating reactive current blocking limit.
3.
Press the
Accept
button to save the modified parameter.
Setting tap synchronization
With the
Tap synchronization
parallel operation method, you need to desig-
nate one device as the master and all other devices as followers. The mas-
ter handles voltage regulation and transmits its current tap positions to all
followers via the CAN bus. The followers compare the tap position received
with their own tap position. If the tap position is not the same, the followers
switch to the tap position received from the master. This ensures that the
transformers operating in parallel are always in the same tap position.
If there is a tap difference between the master and follower, 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.
For the tap synchronization method, you can select the following options:
Option
Description
Master
The device is designated as the master.
Follower
The device is designated as the follower.
Auto. tap syn-
chronization
Automatic assignment of master or follower.
If no master is detected, the device with the lowest
CAN bus address is automatically designated as the
master. All other devices are designated as followers.
Table 25: Tap synchronization method
To select the tap synchronization parallel operation method, proceed as fol-
lows:
1.
Go to
Settings > Parameters >
Parallel operation > Parallel opera-
tion method
.
2.
Select the option you want.
3.
Press the
Accept
button to save the modified parameter.
6.6.2.2
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