Siemens MJ-5 Installation And Operation Manual page 54

6
MJ-5 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
regulation is desired under either forward or reverse power
flow conditions.
In this mode, the tap changer operates when current
magnitude exceeds the I Threshold % set point. The tap
changer operates in forward mode when forward current
magnitude exceeds the I Threshold % set point, and in
reverse mode when reverse current magnitude exceeds the I
Threshold % set point.
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
Siemens Industry, Inc.
.
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 % set point, tap changes are inhibited and the
regulator idles at the last tap position. Tap changer
operation resumes when forward current magnitude
exceeds the I Threshold % set point.
Select Pwr Flow: IDLE R on the <CONFIGURE> menu.
Figure 6.5 Idle Reverse Mode
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