8-8
Alarm Configuration
8.2.1. Over Temperature Alarms - Load Shedding and Auto Recovery
For Over Temperature Alarms, the Load Shedding feature is used to switch specific,
user-defined plugs On or Off whenever temperature exceeds the Alarm Set Threshold
value. This allows the VMR/NPS to automatically shut off non-essential devices in order
to reduce the temperature generated within the rack, or automatically switch On devices
such as fans or cooling systems in order to dissipate heat. When the Auto Recovery
feature is enabled, the VMR/NPS can also automatically "undo" the effects of the Load
Shedding feature when the temperature again falls to a user-defined non-critical level.
Note:
Load Shedding Configuration Menus for both the Initial and Critical
Over Temperature Alarms offer essentially the same set of parameters, but
parameters defined for each alarm are separate and unique. For example,
parameters defined for Over Temperature (Initial) Alarm Load Shedding will not
be applied to Over Temperature (Critical) Alarm Load Shedding and vice versa.
The Load Shedding Configuration menus allow you to defined the following parameters:
•
Configure Load Shedding for Unit:
In the Text Interface, this item is used to
access the Load Shedding parameters listed below. In the Web Browser Interface,
Load Shedding parameters are accessed via the "Load Shedding" button in the
Temperature Alarm configuration menus.
•
Enable:
Enables/Disables Load Shedding for the Over Temperature Alarm.
When enabled, the VMR/NPS will switch the user specified plugs whenever the
temperature exceeds the Alarm Set Threshold value. (Default = Disable.)
•
Plug State:
Determines whether the selected plugs/plug groups will be switched
On or Off when Load Shedding is enabled and temperature exceeds the user-
defined Alarm Set Threshold. For example, if the Plug State is set to "Off",
then the selected plugs/plug groups will be switched Off when the Alarm Set
Threshold is exceeded. (Default = Off.)
•
Auto Recovery:
Enables/Disables the Auto Recovery feature for the selected
unit. When both Load Shedding and Auto Recovery are enabled, the VMR/NPS
will return plugs to their former On/Off state after the temperature falls below the
Alarm Clear Threshold value. This allows the VMR/NPS to "undo" the effects of
the Load Shedding feature after the temperature returned to an acceptable level.
(Default = Off.)
•
Plug Access:
Determines which Plug(s) will be switched when the temperature
exceeds the Alarm Set Threshold and Load Shedding is triggered. For
example, if plugs A1, A2 and A3 are selected, these plugs will be switched On
or Off whenever the temperature exceeds the Alarm Set Threshold. (Default =
undefined.)
•
Plug Group Access:
Determines which Plug Group(s) will be switched when
the Load Shedding feature is triggered. (Default = undefined.)
Note:
In order to define Plug Group Access, you must first define at least one
Plug Group as described in Section 6.5.
