35
CET Inc.
Current OFF Delay
The minimum duration that the Current of
a particular channel must fall below the
OFF Threshold before the Status would
switch from ON to OFF.
0 to 9999 (s)
30 s
Table 4-6 Global Parameters
The Universal Hysteresis is a global parameter that is used to prevent measurement fluctuation around
the threshold point from causing an alarm to fluctuate between the Active and Inactive states.
The PMC-512-D provides the ON/OFF status for each Current channel to indicate whether the channel is
ON (Loaded) or OFF (No Load). If the channel status is OFF, it means that the channel has no load which
would prevent the Low and Low-Low alarms from activating.
The following figures illustrate the logic diagram of the Current ON/OFF status, respectively.
Where
Current ON Limit =
Breaker Rating
×
Current ON Threshold
Current OFF Threshold = Current ON Threshold × (1 – Universal Hysteresis)
Current OFF Limit = Breaker Rating
×
Current OFF Threshold
It should be noted that the absolute value of the Current ON/OFF Limit is calculated based on the
Breaker Rating parameters. Therefore, it’s critical to set the Breaker Rating correctly for the Mains and
each Branch Circuit for the Current Alarms to work properly.
Figure 4-2 Current ON Logic Diagram
Figure 4-3 Current OFF Logic Diagram
Figure 4-4 Current ON/OFF Status
4.3.3 Voltage Alarms and ON/OFF Status
PMC-512-D provides the
Voltage ON/OFF
status as well as two Voltage Alarm levels (High and Low) for
the Mains Circuit. The Voltage H/L Alarms will only be evaluated if it’s determined that the
Voltage
status is
ON
.