Siemens MJ-5, Инструкция по установке и эксплуатации

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4 Setting Up the MJ-5 Control Panel
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raise or lower and it will move to 8 raise or lower if it is on
a higher tap.
When planning to overload a regulator use either the Soft
Vari-Amp or the knobs on the position indicator. AutoVari-
Amp is for protection in case of accidental overload only.
The Vari-Amp limits are defined in the voltage regulator
instruction manual.
4.3.29 Soft Vari-Amp (SoftwareVari-Amp)
The Soft Vari-Amp data item is a software implementation
of Vari-Amp knobs on the position indicator. If set to ON,
the R Limit % and L Limit % will prohibit tap raise/lower
past that position. The regulator will be limited by both the
Vari-Amp knobs and the SoftVari-Amp. The actual
boundary will be the most restrictive combination of the
two (e.g., knobs limit R to 10%, L to 7.5% and software
limit R to 5% and L to 8.75%. In this case the limits would
be R at 5% and L at 7.5%).
4.3.30 R Limit, L Limit
These items set the Tap Position Raise and Lower Limit
values; the control uses the limit values to check for
“raise/lower limit reached” Alert conditions. Configure
these parameters to match the Vari-Amp settings on the
side of the Tap Position Indicator Dial mounted on the
regulator. (For most applications, the Vari-Amp settings are
at 10%.) If the Tap Position reaches or exceeds the R Limit
Setting, the control activates the “R Limit Reached” Alert.
Likewise, if the Tap Position reaches or exceeds the L
Limit Setting, the control activates the “L Limit Reached”
Alert. The R Limit/L Limit settings are always used for
alerting—these limit settings only prevent tap raise/lower
operations from exceeding the limits if Soft Vari-Amp
setting is turned ON.
4.3.31 Tap Alert
The Tap Alert data item enables or disables all tap alerts,
including: R Limit Reached, L Limit Reached, Neut Sig
Err, Tap Pos ???, and Tap Track Err.
4.3.32 Alrt M=? C=? S=?
The Alrt data item permits groups of alerts to be turned off
and on. Metering (M) alerts include Low Current, Low PT
Thresh, Over Current, and High Voltage. Control (C) alerts
include Auto Inhibit, Pseudo Manual, and Not in Auto.
System (S) alerts include NV RAM Reset, Low Battery,
and Self-Test Fault. Press change and use the left/right and
up/ down arrows to adjust the M, C, and S alert settings.
4.3.33 Tap Resync
The Tap Resync data item determines whether the
electronic tap position will re synchronize itself to neutral
when the tap changer is on the neutral tap. Turning this data
item OFF results in better tap tracking and the control will
not adjust its tap position according to the neutral signal.
Turning this data item ON will require the neutral signal
status to precisely match the electronically tracked tap
position and the timing of the operations counter or the
maintained tap position will be purposely discarded.
4.3.34 CommAutoInh (Communications Auto
Inhibit)
The Comm Auto Inhibit data item provides a way to
change the state of the Auto Inhibit status at the control
panel. This can be used if the Auto Inhibit state is turned on
remotely and the communications link goes down; in this
event, someone can go to the controls location and enable
automatic operation again.
4.3.35 Lower LED
In the MJ-5 panels, the Raise and Lower LEDs have been
combined to one single LED. When lowering the Tap
position the user may choose to have the LED glow solid or
blink by choosing the setting. The Raising of the tap
position will be indicated by the LED glowing solid. The
default setting for the Lower LED is solid.
4.3.36 P2 Calc
P2 Calculation can be enabled or disabled from the P2
Calc screen. P2 Calculation should be enabled for
regulators that have no Potential Transformer. For
regulators with voltages on both the Load and Source
bushing, the P2 calculation may be disabled. Thus, if the
PT is faulty, the voltage in the meter menu will be indicated
by dashes. The default is for P2 calculation to be enabled.
4.3.37 U2/P2 Out
When measured with a multi-meter, the Load Voltage
(unscaled) terminals on the front panel have been locked to
show the Load side voltage by default. The load voltage
will vary depending on the user defined power flow mode
and the power flow direction. The terminals may be locked
to show exclusively U2 or P2 only, or the terminals can be
configured to toggle between the two voltages with
successive key presses of the U2 P2 Key.
4.3.38 Current Bias
The user may choose None, Fwd, Rev or NeutT for current
flow modes. The Bias percent is selected from the
following Bias % data item.
4.3.39 Bias Percent
The minimum Bias percent is 0% and the maximum is
10%. The user may choose to use any value between the
maximum and minimum in increments of 1%. This
functionality is only in effect when the power flow mode is
Bi-Directional and Current Bias is not selected as “None”.
Note that the Bias percent must be greater than the I
Threshold %.
Typically, I Threshold % should be set to
0%. For a detailed description, see Section 6.5.3
4.3.40 Remote Btn
The functionality of the Remote / Local button can be
enabled or disabled from this screen. When Enabled,
pressing the Remote/Local button will cause the control to
function as described in Section 6.1; when set to Disabled,
the control can enter the Manual, Off, or Auto-Remote
modes. The Auto-Local mode is disabled.