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 Outlet Restrictions prevents users from turning on outlets when the
Restrictionscurrent 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 | You can customize the Overload Audible Alarm so that it never sounds, |
Alarm | 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 | In addition to monitoring for overload conditions, the current sensor |
Threshold | monitors for |
| 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. |
MasterSwitch VM User’s Guide | 9 |
