
34
CET Inc.
the Max. Demand of
Last Month
and then reset. The
terms
This Month
and
Last Month
will become
Since Last
Reset
and
Before Last Reset
.
Self-Read Mode
(Reg. # 6009)
•
0=Auto
•
1=Manual
Default = 0
Table 4-5 Demand Setup
4.3 Alarm Setpoints
The PMC-512-D provides powerful alarming functions for the Mains Meter, 12 Sub-Meters as well as
different parameters. Each Alarm Type has an independent enable switch, which allows the alarms for
Mains Meter, SM and other parameters to be enabled individually as needed. The alarms may also be
disabled by setting their respective alarm thresholds to 0.
4.3.1 Alarm Status
The PMC-512-D supports both the Instantaneous Alarm and Latched Alarm, which are defined below.
Instantaneous Alarm
The status of an Instantaneous Alarm becomes ALARM when the alarm condition is met and is
automatically reset to NORMAL when the alarm condition is no longer met. Instantaneous Alarm cannot
be reset manually.
Latched Alarm
On the other hand, the status of a Latched Alarm becomes ALARM when the alarm condition is met and
will remain in the ALARM state even after the alarm condition is no longer met. The Latched Alarm must
be reset manually. However, the Latched Alarm cannot be reset while the alarm condition remains.
Figure 4-1 Alarm Status
4.3.2 Universal Hysteresis and Current ON/OFF Status
The Universal Hysteresis, Current ON Threshold, Current ON Delay and Current OFF Delay are global
parameters that are valid for all relevant alarms.
Parameters
Description
Range
Default
Value
Universal Hysteresis
The hysteresis rate for calculating the
Return Threshold for all Alarms.
0 to 10%
2%
Current ON Threshold
The ON Threshold that applies to all Current
channels for switching from the OFF to ON
state.
0 to 10%
5%
Current ON Delay
The minimum duration that the Current of
a particular channel must exceed the ON
Threshold before the Status would switch
from OFF to ON.
0 to 9999 (s)
10 s