Types Of Setpoint-Controlled Functions - Siemens ACCESS 9340 Reference Manual

ACCESS 9340 and 9360 Meters
Chapter 6—Basic Alarms

Types of Setpoint-controlled Functions

EN–76
This section describes some common alarm functions to which the
following information applies:
•
Values that are too large to fit into the display may require scale
factors. For more information on scale factors, refer to "Changing
Scale Factors" on page 217.
•
Relays can be configured as normal, latched, or timed. See
"Relay Output Operating Modes" on page 62 in Chapter 5—
Input/Output Capabilities for more information.
•
When the alarm occurs, the meter operates any specified relays.
There are two ways to release relays that are in latched mode:
— Issue a command to de-energize a relay. See Appendix B—
Using the Command Interface for instructions on using the
command interface, or
— Acknowledge the alarm in the high priority log to release the
relays from latched mode. From the main menu of the display,
press ALARM to view and acknowledge unacknowledged
alarms.
The list that follows shows the types of alarms available for some
common alarm functions:
NOTE: Voltage based alarm setpoints depend on your system
configuration. Alarm setpoints for 3-wire systems are V
while 4-wire systems are V
Undervoltage: Pickup and dropout setpoints are entered in volts.
The per-phase undervoltage alarm occurs when the per-phase
voltage is equal to or below the pickup setpoint long enough to satisfy
the specified pickup delay (in seconds). The undervoltage alarm
clears when the phase voltage remains above the dropout setpoint
for the specified dropout delay period.
Overvoltage: Pickup and dropout setpoints are entered in volts. The
per-phase overvoltage alarm occurs when the per-phase voltage is
equal to or above the pickup setpoint long enough to satisfy the
specified pickup delay (in seconds). The overvoltage alarm clears
when the phase voltage remains below the dropout setpoint for the
specified dropout delay period.
Unbalance Current: Pickup and dropout setpoints are entered in
tenths of percent, based on the percentage difference between each
phase current with respect to the average of all phase currents. For
values.
L-N
© 2008 Siemens Energy & Automation, Inc. All Rights Reserved.
PMCM-9340D-0208
2/2008
values
L-L