EET PMC-D726M - Chapter 4 Applications; Inputs and Outputs; Digital Inputs; Digital Output

CET Electric Technology
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Chapter 4 Applications
4.1 Inputs and Outputs
4.1.1 Digital Inputs
The PMC-D726M comes optionally with two self-excited Digital Inputs that are internally wetted at 24
VDC. Digital Inputs are typically used for monitoring external status which can help prevent equipment
damage, improve maintenance, and track security breaches. The real-time statuses of the Digital Inputs
are available on the front panel as well as through communications. Changes in Digital Input status are
stored as events in the SOE Log in 1 ms resolution.
4.1.2 Digital Output
The PMC-D726M comes optionally with two Mechanical Relay Output since Firmware V1.00.03
(LED)/V1.01.03 (LCD). Digital Outputs are normally used for Setpoint alarming, load control, or remote
control applications.
The Digital Output on the PMC-D726M can be used in the following applications:
1) Front Panel Control Manually operated from the front panel. Please refer to the DO
SET setup parameter in Section 3.5.3 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-D726M, 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-D726M comes standard with two front panel LED Pulse Outputs and optionally with two Solid
Relay Output for kWh or kvarh pulsing. Energy Pulse Outputs are typically used for accuracy testing.
Energy pulsing can be enabled from the front panel through the ENGY PULS setup parameter. The Pulse
Constant per kXh, where kXh may be kWh or kvarh, can be configured through the ENGY CNST setup
parameter:
 1A Current Input: 1000/3200/5000/6400/12800
 5A Current Input: 1000/3200/5000
 2.5mA Current Input*: 1000/3200/5000
 40mA Current Input*: 40/100/400
*Available since Firmware V1.00.07 (LED) / V1.01.07 (LCD)