Siemens MJ-4 Series User Manual

6 MJ-4A & MJ-4B Control Panel Automatic Mode
Siemens Energy, Inc. 51
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 % setpoint, at which
time further tap changes are inhibited. The tap changer
resumes operation when the reverse current drops below
the I Threshold % setpoint.
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
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 % setpoint, at which
time further tap changes are inhibited. The tap changer
resumes operation when forward current magnitude
drops below the I Threshold % setpoint.
In this mode, when power flow is Forward, Demand val-
ues are not calculated.
View Pwr Flow: R LOCK on the <CONFIGURE> Menu.
Figure 6.3 Reverse Locked Mode
01% 1%Threshold %
Current
Reverse Current Forward Current
RPF indicator flashing
Tap changer operates
Tap changes resume
RPF indicator off
Tap changes
inhibited
I 01% 1% Threshold %
Current
Reverse Current Forward Current
Tap changer operates
Tap changes resume
RPF indicator
flashing
Band indicators
flashing
Tap changes
inhibited
Band indicators on
RPF indicator on
I

Siemens MJ-4 Series Specifications

General

Brand	Siemens
Model	MJ-4 Series
Category	Control Panel
Language	English