Western Telematic MPC-20VS16-3 - Manual (Page 113)

7-2
Alarm Configuration
7.1. The Over Current Alarms
The Over Current Alarms are designed to inform you when current consumption
reaches or exceeds user-defined levels. Depending on the specific MPC model, MPC
units can have up to four Over Current Alarms (two sets of two alarms):
• The Over Current Line (Initial) Alarm
• The Over Current Line (Critical) Alarm
• The Over Current Branch (Initial) Alarm
• The Over Current Branch (Critical) Alarm
Notes:
• The Line Alarms are only included in MPC models that include two or more
power branches per input line.
• The parameters that are defined via the Over Current (Initial and Critical)
Alarm Configuration menus will be applied to both Over Current Line Alarms
and Over Current Branch Alarms.
• The MPC does not include separate configuration menus for the Line and
Branch Overcurrent Alarms. Parameters that are defined via the Over Current
Alarm configuration menus will be applied to both Branch and Line (if
present) Alarms.
The Line alarms monitor the load on the input line, and are only available on single input
units, whereas the Branch alarms monitor the load on each branch circuit breaker.
The Initial alarms are used to provide notification when the level of current consumption
reaches a point where you might want to investigate it, whereas the Critical alarms can
provide notification when the level of current consumption approaches the maximum
allowed level. The trigger levels for the Initial alarms are generally set lower than the
trigger levels for the Critical alarms.
If the user-defined trigger levels for current load are exceeded, the MPC can
automatically shut off power to non-essential devices ("Load Shedding") in order to
decrease current load. After Load Shedding has taken place, the MPC can also restore
power to the non-essential devices when current load drops to user-defined acceptable
levels. For more information on Load Shedding, please refer to Section 7.1.1.
The Load Shedding feature can be configured to react in one manner when an Over
Current Line Alarm is triggered, and in a different manner when an Over Current Branch
Alarm is triggered. For example, Load Shedding may be configured in such a way that
when the Line Alarm is triggered, plugs A1 and B1 are switched Off, but when a Branch
Alarm is triggered, plugs A1 and A2 are switched Off.
Notes:
• In order for the MPC to provide alarm notification via Email, communication
parameters must first be defined as described in Section 5.9.11.
• In order for the MPC to provide alarm notification via Syslog Message, Syslog
parameters must first be defined and Syslog Messages must be enabled as
described in Section 5.9.2 and Section 11.
• In order for the MPC to provide alarm notification via SNMP Trap, SNMP
parameters must first be defined, and SNMP Traps must be enabled as
described in Section 5.9.7 and Section 12.