Western Telematic MPC-20VS16-3 - Manual (Page 116)

7-5
Alarm Configuration
7.1.1. Over Current Alarms - Load Shedding and Auto Recovery
The Load Shedding feature is used to switch specific, user-defined, non-essential plugs
On or Off whenever current load exceeds the Alarm Set Threshold value. This allows
the MPC to automatically shut Off plugs in order to reduce current load when the load
approaches user-defined critical levels. When the Auto Recovery feature is enabled,
the MPC can also automatically "undo" the effects of the Load Shedding feature when
current load again falls to a user-defined non-critical level.
The MPC also allows you to define separate Load Shedding/Recovery actions for an
Over Current Branch Alarm and an Over Current Line Alarm. For example, if the Line
Alarm is triggered, Load Shedding can switch Off Plugs A1 and B1, yet when the Branch
"A" Alarm is triggered, the MPC can switch Off Plugs A1 and A2.
Together, the Load Shedding and Auto Recovery features allow the MPC to shut off
power to non-essential devices when the current load is too high, and then switch those
same non-essential devices back On again when the load falls to an acceptable level.
Notes:
• The Load Shedding Configuration Menus for all Over Current Alarms offer
essentially the same set of parameters, but the parameters defined for each
alarm are separate and unique. For example, parameters defined for Over
Current (Initial) Alarm Load Shedding will not be applied to Over Current
(Critical) Alarm Load Shedding and vice versa.
• The Load Shedding Configuration Menus for the Text Interface and Web
Browser Interface differ slightly; in the Web Browser Interface the Local/
AUX setting and Branch/Line setting are defined via the Over Current
Alarm Configuration Menu, whereas in the Text Interface, these settings are
accessed via submenus of the Load Shedding Configuration Menu.
7.1.1.1. Load Shedding & Auto Recovery Configuration - Text Interface
In the Text Interface, Load Shedding parameters for the Over Current Alarms are defined
as follows:
1. Access the Over Current Alarm Configuration Menu as described in Section 7.1.
2. At the Over Current Alarm Configuration Menu, type 5 and press [Enter] to access
the Load Shedding Configuration Menu. The following parameters will be available:
1. Unit to Configure: When optional, remote MPC or BPM units have been
connected to your local MPC's AUX ports, this parameter is used to select the
Local or AUX unit that you wish to define Load Shedding parameters for.
(Default = Local.)
2. Branch A Load Shedding: Defines the Load Shedding actions that will be
executed by the selected (Local or AUX) MPC unit when an Over Current
Branch Alarm is triggered at Branch "A".
3. Branch B Load Shedding: Defines the Load Shedding actions that will be
executed by the selected (Local or AUX) MPC unit when an Over Current
Branch Alarm is triggered at Branch "B".
4. Line Load Shedding: Defines the Load Shedding actions that will be executed
by the selected (Local or AUX) MPC unit when an Over Current Line Alarm is
triggered.