Siemens MJ-XL Installation And Operation Manual page 50

6
MJ-XL Control Panel Automatic Mode
BI-DIR (Bi-directional mode)
This mode of operation is intended for use on systems
where reverse power flow is anticipated and voltage regu-
lation is desired under either forward or reverse power
flow conditions.
In this mode, the tap changer operates when current mag-
nitude exceeds the I Threshold % setpoint. The tap
changer operates in forward mode when forward current
magnitude exceeds the I Threshold % setpoint, and in
reverse mode when reverse current magnitude exceeds
the I Threshold % setpoint.
If the I Threshold % setpoint is set to zero, the regulator
operates as above, using the 1% operational limits in
place of the I Threshold % setpoints.
View Pwr Flow: Bi-dir on the <CONFIGURE> Menu.
Reverse Current
Reverse
Operation
Tap Changes Inhibited
RPF indicator on
Band indicators flashing
I Threshold % 1%
Current
Bi-directional Mode
Figure 6.4
46
Forward Current
Forward
Operation
RPF indicator off
0 1% I Threshold %
IDLE R (Idle Reverse)
This mode of operation is intended for use on systems
where reverse power flow is an abnormal situation. Under
reverse power flow conditions, the regulator idles at the
last tap position.
In this mode, the controller always operates in forward
mode. When forward current magnitude drops below the
I Threshold % setpoint, tap changes are inhibited and the
regulator idles at the last tap position. Tap changer opera-
tion resumes when forward current magnitude exceeds
the I Threshold % setpoint.
If the I Threshold % setpoint is set to zero, the regulator
operates as above, using the 1% operational limits in
place of the I Threshold % setpoints.
Select Pwr Flow: IDLE R on the <CONFIGURE> Menu.
Reverse Current
Tap Changes Inhibited
RPF indicator on
Band indicators flashing
1%
Current
Idle Reverse Mode
Figure 6.5
Siemens Power Transmission & Distribution, Inc.
Forward Current
Forward
Operation
RPF indicator off
0 1% I Threshold %