Siemens MJ-5 Installation And Operation Manual page 53

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MJ-5 Control Panel Automatic Mode
F LOCK (Forward Locked Mode)
This mode of operation is intended for use on systems
where reverse power flow is not anticipated. Tap changes
are inhibited under reverse power flow conditions.
In this mode, the controller always operates in forward
mode. The tap changer operates unless reverse current
magnitude exceeds the I Threshold % set point, at which
time further tap changes are inhibited. The tap changer
resumes operation when the reverse current drops below
the I Threshold % set point.
In this mode, if power flow does reverse, Demand values
are not computed.
View Pwr Flow: F LOCK on the <CONFIGURE> menu.
Figure 6.2 Forward Locked Mode
Siemens Industry, Inc.
R LOCK (Reverse Locked Mode)
This mode of operation is intended for use on systems
where forward power flow is not anticipated. Tap changes
are inhibited under forward power flow conditions.
In this mode, the controller always operates in reverse
mode. The tap changer operates unless forward current
magnitude exceeds the I Threshold % set point, at which
time further tap changes are inhibited. The tap changer
resumes operation when forward current magnitude drops
below the I Threshold % set point.
In this mode, when power flow is Forward, Demand values
are not calculated.
View Pwr Flow: R LOCK on the <CONFIGURE> menu.
Figure 6.3 Reverse Locked Mode
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