8-17
Alarm Configuration
8.8. The Plug Current Alarm (VMR Only)
The Plug Current Alarm allows you to monitor current consumption at each of the VMR's
switched outlets and generate an alarm when current exceeds a user-defined "High"
threshold or falls below a user-defined "Low" threshold. The Plug Current Alarm can
also be applied to user-defined Plug Groups in order to generate an alarm when total
current consumption for the given Plug Group rises too high or falls too low.
Note:
Current and Power Monitoring features are not available on NPS units.
If desired, the Plug Current Alarm can also be configured to automatically shut off
individual plugs or user-defined Plug Groups, whenever current consumption rises
above a user-defined threshold value.
To configure the Plug Current Alarm, access the VMR command mode using a
password that permits Administrator Level commands and then use the Alarm
Configuration menu to select the desired alarm feature. The Plug Current Alarm allows
the following parameters to be defined:
•
Trigger Enable:
Enables/Disables the trigger for this alarm. When disabled, this
alarm will be suppressed. (Default = On.)
Note:
• When an alarm is generated, to cancel an alarm without correcting the
condition that caused the alarm, simply toggle the Trigger Enable parameter
Off and then back On again.
• The Trigger Enable, Notify on Clear, Email Message and Address 1, 2 and 3
Parameters all include "Copy to All Triggers" options that allow you to enable/
disable the corresponding parameter for all VMR/NPS alarms. For example,
if the Plug Current Alarm's Trigger Enable parameter is set to "On (Copy to All
Triggers), then all other VMR/NPS alarms will also be enabled.
•
Plug Hysteresis:
This parameter can be used to prevent the Plug Current
Alarm from generating excessive "Alarm" and "Clear" messages when current
consumption fluctuates back and forth across the trigger value. Basically, the Plug
Hysteresis parameter allows you to define a margin at both the Low Threshold and
High Threshold that the current level must cross in order to clear an alarm.
(Default = 0.5 Amps)
Plug Hysteresis Example: Assume that the Low Threshold for Outlet A1 is set at 5
Amps, the High Threshold is set at 12 Amps and the Plug Hysteresis value is set at
1 Amp. When the current goes high or low, the VMR will respond as follows:
• Low Alarm: If the current drops below 5 Amps, the VMR will generate an Alarm.
The Alarm will not be cleared until the current rises above 6 Amps
(5 Amp Low Thr 1 Amp Hysteresis Value = 6 Amps.)
• High Alarm: If the current rises above 12 Amps, the VMR will generate an Alarm.
The Alarm will not be cleared until the current drops below 11 Amps.
(12 Amp High Threshold - 1 Amp Hysteresis Value = 11 Amps.)
