CET Electric Technology
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1) Front Panel Control Manually operated from the front panel. Please refer to the DO
Control setup parameter in Section 3.3.3 for a detailed description.
2) Remote Control Remotely operated over communications via our free PMC Setup
software or PecStar® iEMS Integrated Energy Management System.
3) Control Setpoint Control Setpoints can be programmed to trigger DO action upon
becoming active. Please refer to Section 4.4 for a detailed
description.
Since there are multiple ways to trigger the Digital Outputs on the PMC-53A, a prioritized scheme has
been developed to avoid conflicts between different applications. In general, Front Panel Control has
the highest priority and can override other control schemes. Remote Control and Control Setpoint share
the same priority, meaning that they can all be programmed to control the same Digital Output. This
scheme is equivalent to having an implicit Logical OR operation for the control of a Digital Output and
may be useful in providing a generic alarm output signal. However, the sharing of a Digital Output is not
recommended if the user intends to generate a control signal in response to a specific setpoint condition.
4.1.3 Energy Pulse Outputs
The PMC-53A comes standard with one front panel LED Pulse Output for energy pulsing and can be
equipped with two or four optional Solid State Relay Outputs for kWh and kvarh pulsing. Energy Pulse
Outputs are typically used for accuracy testing. Energy Pulsing via the front panel LED can be enabled
from the front panel through the LED EN Pulse setup parameter. The pulse constant can be configured
as 1000/3200 pulses per kWh or kvarh through the EN Pulse CNST setup parameter.
4.1.4 Analog Input
The PMC-53A comes optionally with an Analog Input which can be programmed as 0mA to 20mA or
4mA to 20mA input. There are 3 setup parameters:
Type: Select between 0-20mA or 4-20mA input.
AI Zero: This value corresponds to the minimum Analog Input of 4 mA (for 4-20mA input) and
has a range of -999,999 to +999,999.
AI Full: This value corresponds to the maximum Analog Input of 20 mA and has a range of -
999,999 to +999,999.
For example, to measure the oil temperature of a transformer, connect the outputs of the temperature
sensor to the AI terminals of the PMC-53A. The temperature sensor outputs 4mA when the
temperature is -25°C and 20mA when the temperature is 100°C. As such, the Type parameter should
be programmed as 4-20mA. The AI FULL parameter should be programmed with the value 100, and the
AI ZERO parameter should be programmed with the value -25. Therefore, when the output of the
sensor is 20mA, the reading will be 100.00°C. When the output is 4mA, the reading will be -25.00°C.
When the output is 12mA, the reading will be (100°C - (-25°C)) x (12mA-4mA) / (20mA-4mA) + (-25°C)
= 37.50°C.
4.1.5 Analog Output
The PMC-53A comes optionally with one Analog Output which can be programmed as 0mA to 20mA or
4mA to 20mA output.
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