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MasterSwitch VM User’s Guide 9
Introduction
Operating MasterSwitch VM continued
Current sensing
Each MasterSwitch
VM
unit is equipped with a sensor that measures
the total current being used by the unit and devices connected to the
unit. The current measurement is displayed on the first screen that
appears when you log on and is used to generate alarms that you
define. The values displayed are:
• The aggregate current
• A percentage of the branch circuit rating, which is derived using
the following formula:
In the Unit Configuration section of the MasterSwitch
VM
menu, you can
define Overload Outlet Restrictions, conditions that generate an
Overload Audible Alarm, and the Low Current Threshold. (See
Unit
Configuration on page 16
for a detailed description of the items listed in
the menu.)
Do not exceed the maximum voltage and current ratings listed
on the label on the back of the unit.
Overload Outlet
Restrictions
Outlet Restrictions prevents users from turning on outlets when the
current sensor detects an overload condition. The following restrictions
can be set for each unit:
None
Outlets always turn on.
On Warning
Outlets do not turn on when the Overload Warning
Threshold has been exceeded.
On Overload
Outlets do not turn on when the full load percentage
exceeds
100
%.
Overload Audible
Alarm
You can customize the Overload Audible Alarm so that it never sounds,
it sounds when the load exceeds
100
%, or it sounds when the load
exceeds its Overload Warning Threshold. The value for the Overload
Warning Threshold can be set at a value that you determine based on
the needs of your system. If the Overload Audible Alarm is set to On
Overload Warning and the load exceeds the Overload Warning
Threshold, the Overload Warning
LED
flashes green and the alarm
sounds.
Low Current
Threshold
In addition to monitoring for overload conditions, the current sensor
monitors for low-current conditions. If current drops below the Low
Current Threshold that you have defined, the unit generates an
SNMP
trap to alert the host computer.
Note
: This item is available only in the
SNMP
interface.