Precision-digital PD6200 User Manual download pdf (Page 59)

Model PD6200 Analog Input Rate/Totalizer Instruction Manual

Relay Operation Details

Overview

The relay capabilities of the meter expand its usefulness beyond simple

indication to provide users with alarm and control functions. These capa-

bilities include front panel alarm status LEDs as well as either 2 or 4 op-

tional internal relays and/or 4 external relays expansion module. Typical

applications include high or low temperature, level, pressure or flow

alarms, control applications such as simple on/off pump control, pump

alternation control for up to 8 pumps, and basic batch control. There are

four basic ways the relays can be used:

1. High or Low Alarms with Latching or Non-Latching Relays

2. Simple On/Off Control with 100% Adjustable Deadband

3. Sampling (Based on Time)

4. Pump Alternation Control for up to 8 Pumps

Relays Auto Initialization

When power is applied to the meter, the front panel LEDs and alarm

relays will reflect the state of the input to the meter. The following table

indicates how the alarm LEDs and relays will react on power-up based

on the set and reset points:

Alarm #

HI or LO

Alarm

Set

Point

Reset

Point

Power-Up

Reading

Relay &

LED

1 HI 1000 500 499 Off

2 LO 700 900 499 On

3 LO 250 400 499 Off

4 HI 450 200 499 On

Fail-Safe Operation

The following table indicates how the relays behave based on the fail-

safe selection for each relay:

Fail-Safe

Selection

Non-Alarm State Alarm State

Power Failure

NO NC NO NC

Off Open Closed Closed Open

Relays go to

non-alarm state

On Closed Open Open Closed

Relays go to

alarm state

Note: NO = Normally Open, NC = Normally Closed. This refers to the

condition of the relay contacts when the power to the meter is off.

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Precision-digital PD6200 User Manual Page 59

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