Alerts-The <Alert> Menu - Siemens MJ-4A Installation And Operation Manual

5
Reading and Interpreting MJ-4A & MJ-4B Control Panel Data
5.8 Alerts—the <Alert> Menu
Alerts represent exception conditions. A Alert condition
may be presently active, or it may have been active at
some earlier time. When a Alert occurs, the MJ-4 stores it
in the <ALERT> Menu, and illuminates the Alert LED Indi-
cator.
5.8.1 Viewing Alerts
If the Alert indicator is flashing, it denotes that a Alert has
occurred. Use either the Alert fast path key or the Menu
and Scroll keys to view the <Alert> Menu. Use the down
arrow key to scroll through the Alerts.
Table 5.8 Alert Data Items
Alert Name
Low Current Low Current reading-- Magnitude below 1% full scale.
Auto Inhibit Automatic mode inhibited from either terminal block or communication
link
Pseudo Manual A remote tap raise/lower operation has been requested
(via Communications Module)
6
Tap Track Error The dead reckoning procedure has detected an inconsistency between its
assumed tap changer position and the position signaled by the PDS.
Neutral Signal The MJ-4 senses that the Neutral signal remains active though the tap
Error change input indicates that the tap has moved from Neutral.
Tap Position ???? The MJ-4 does not know the present tap position (based on the dead reck-
oning algorithm).
Low PT Threshold The MJ-4 detects a Vld voltage below the PT Threshold setting.
Over Current The current exceeds the threshold determined by:
I Load Max(%) x I FullLoad
NV RAM Reset The non-volatile (battery-backed) Static RAM appears to have lost some or
all of its data.
Low Battery The back-up battery is below the minimum threshold and should be
replaced.
High Voltage Maximum PT voltage exceeded (145 Volts for U2 and/or P2)
Not in auto Auto/Manual switch is in Manual
R Limit Reached Raise Limit Reached. Tap position has reached or exceeded the value
specified in "R Limit" item
L Limit Reached Lower Limit Reached. Tap position has reached or exceeded the value
specified in "L Limit" item
Self Test Fault The MJ-4 self test found an error condition
Notes for Table 5.8:
1. Alert status is in effect if any Message condition is active. If the Alert status is the result of more than one condition, the Message
Indicator will flash until all Alerts requiring acknowledgment have been acknowledged. Whenever the Alert Indicator is flashing, it is an
indication that the contents of the <ALERT> Menu should be reviewed.
2. Continuous - Condition lasts indefinitely. (May persist after Alert is acknowledged.)
3. Momentary - Condition lasts briefly.
4. ACK required - The MJ-4 keeps the Alert active until you acknowledge it.
5. Auto-clear - The MJ-4 automatically clears the Alert when the condition ceases.
6. The Tap Track Error alert can be disabled, if desired. See Table 4.2 on page 17 .
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If the Alert name is flashing, acknowledgment is required.
5.8.2 Acknowledging an Alert
To acknowledge the Alert, press the Cancel/Reset key. If
the Alert condition is still active, the Alert name will stop
flashing but the Alert indicator will remain on (steady)
until the condition clears. If multiple Alerts have occurred,
you can step through them, one at a time using the Alert
key or the
to flash until all Alerts have been acknowledged.
The conditions listed in Table 5.8 activate ALERT status.
The conditions are listed in priority sequence from highest
priority at the top to lowest priority at the bottom.
Description
and keys. The Alert indicator will continue
Duration
Continuous
Continuous
Continuous
Momentary
Momentary
Continuous
Continuous
Continuous
Momentary
Continuous
Continuous
Continuous
Continuous
Continuous
Continuous
Siemens Energy, Inc.
Ack. Type
Auto-clear
Auto-clear
Auto-clear
ACK required
ACK required
Auto-clear
Auto-clear
ACK required
ACK required
Auto-clear
ACK required
Auto-clear
Auto-clear
Auto-clear
ACK required