Siemens MJ-4 Series User Manual

6 MJ-4A & MJ-4B Control Panel Automatic Mode
52 Siemens Energy, Inc.
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.
I Threshold %, must be set to a minimum of 1%(when I
Dir Bias is not in use; i.e. I Dir Bias = None). See
Section 6.5.1 for more details.
When I Dir Bias is in use, I Threshold should be set to 0%.
View Pwr Flow: Bi-dir on the <CONFIGURE> Menu.
Figure 6.4 Bi-directional Mode
.
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.
Select Pwr Flow: IDLE R on the <CONFIGURE> Menu.
Figure 6.5 Idle Reverse Mode
01% 1%
Threshold % Threshold %
Current
Reverse
Operation
Forward
Operation
Reverse Current Forward Current
Tap Changes Inhibited
Band indicators flashing
I
I
RPF indicator on
RPF indicator off
01% 1%
Threshold %
Current
Forward
Operation
Reverse Current Forward Current
Tap Changes Inhibited
Band indicators flashing
I
RPF indicator on
RPF indicator off

Siemens MJ-4 Series Specifications

General

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