CET Electric Technology
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4.5.2 Maximum Demand Log
The PMC-33M-A records the Maximum Demand of This Month (Since Last Reset) and Last Month
(Before Last Reset) with timestamp for Ia, Ib, Ic, kW Total, kvar Total and kVA Total. All Maximum
Demand information can be accessed through the front panel as well as communications. Please refer
to Section 4.2.3 for a complete description of the Self-Read Time and its operation.
Maximum Demand Logs of This Month (Since Last Reset) and Last Month (Before Last Reset)
Table 4-11 Maximum Demand Log
4.5.3 SOE Log
The PMC-33M-A’s SOE Log can store up to 100 events such as Power-on, Power-off, Digital Input status
changes, Digital Output status changes, Setup changes and Setpoint events in its non-volatile memory.
Each event record includes the event classification, its relevant parameter values and a timestamp in ±1
ms resolution. All events can be retrieved via communications for display. If there are more than 100
events, the newest event will replace the oldest event on a First-In-First-Out basis. The SOE Log can be
reset from the front panel or via communications.
4.6 Diagnostics
The PMC-33M-A provides wiring error detection for 3P4W and 3P3W wiring modes, which allow users
to check for possible problems especially during the initial commissioning stage. The following wiring
errors may be detected:
Frequency Out-of-Range
Voltage / Current Phase Loss
Incorrect Voltage and Current Phase Sequence
kW Direction per phase and Total
Possible Incorrect CT Polarity
Please note the detections above are based on the assumptions below:
The Voltage and Current Phase Sequence are consistent
kW is kW Import, which means the kW is over 0
The wiring is correct
3P4W wiring mode supports all detections
3P3W wiring mode does not support the detection of Voltage Phase Loss, kW Direction per phase
and CT Polarity
The Diagnostic register (0101) indicates the status of the wiring error detection with a bit value of 1
meaning active and 0 meaning inactive which are illustrated in table below:
Summary Bit (Set if any other bit is set)
Frequency is out of range (45 to 65Hz) (3P4W or 3P3W)
Any phase voltage < 10% of PT Primary (Register 6000) (3P4W only)
Any phase current < 10% of CT Primary (Register 6004) (3P4W or 3P3W)
Voltage Phase Reversal (3P4W only)
Current Phase Reversal (3P4W or 3P3W)
Negative kW Total may be abnormal (3P4W or 3P3W)
Negative kWa may be abnormal (3P4W only)
Negative kWb may be abnormal (3P4W only)
Negative kWc may be abnormal (3P4W only)
CTa polarity may be reversed (3P4W only)
CTb polarity may be reversed (3P4W only)
CTc polarity may be reversed (3P4W only)
Table 4-12 Wiring Diagnostic Register
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