EET PMC-33M-A User Manual

CET Electric Technology
30
Chapter 4 Applications
4.1 Inputs and Outputs
4.1.1 Digital Inputs (Optional)
The PMC-33M-A comes optionally with four self-excited Digital Inputs that are internally wetted at 24
VDC with a sampling frequency of 1000Hz and programmable debounce. The PMC-33M-A provides the
following programmable functions for its Digital Inputs:
1) Digital Input The Digital Inputs are typically used for status monitoring 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 LCD Display as well as through
communications. Changes in Digital Input status are stored as
events in the SOE Log in 1 ms resolution.
2) Pulse Counting Pulse counting is supported with programmable pulse weight and
facilitates WAGES (Water, Air, Gas, Electricity and Steam)
information collection.
The following table describes the DI’s setup parameters:
Setup Parameter
Definition
Options/Default*
DIx Function
Each DI can be configured as a Status Input or Pulse Counter.
0=Digital Input*
1=Pulse Counter
DIx Debounce
Specifies the minimum duration the DI must remain in the
Active or Inactive state before a state change is considered to
be valid.
1 to 1000 (ms)
(Default=20ms)
DIx Pulse Weight
Specifies the incremental value for each received pulse. This
is only used when a DI is configured as a Pulse Counter.
1* to 1,000,000
Table 4-1 DI Setup Parameters
4.1.2 Digital Outputs (Optional)
The PMC-33M-A comes optionally with two Form A Electrometrical Relays. Digital Outputs are normally
used for setpoint alarming, load control, or remote control applications.
Digital Outputs on the PMC-33M-A can be used in the following applications:
1) Front Panel Control Manually operated from the front panel. Please refer to the DO
Control setup parameter in Section 3.4.3 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-33M-A, 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 LED Energy Pulse Output
The PMC-33M-A comes standard with one front panel LED Pulse Output for energy 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.

EET PMC-33M-A Specifications

General

Brand	EET
Model	PMC-33M-A
Category	Measuring Instruments
Language	English