Precision-digital PD6000 User Manual download pdf (Page 58)

Model PD6000 Analog Input Process Meter Instruction Manual

Latching Relay (Lt-Clr)

Manual reset only after alarm condition has cleared

Condition LED Relay

Normal Off Off

Alarm On On

Ack (No effect) On On

Normal On On

Ack Off Off

In this application, the meter is set up for manual reset only after the

signal passes the reset point (alarm condition has cleared). Acknowl-

edging the alarm while it is still present has no effect on either the LED

or the relay. When the alarm is acknowledged after it returns to the

normal state, the LED and the relay go off. Notice that the LED remains

on, even after the meter returns to the normal condition. This is be-

cause, for latching relays, the alarm LED reflects the status of the relay,

regardless of the alarm condition.

Acknowledging Relays

There are two ways to acknowledge relays programmed for manual

reset: via the programmable front panel function keys F1-F3 (Default:

F3 assigned to ACK) and remotely via a normally open pushbutton

wired across one of the digital inputs and the +5 V terminals on the digi-

tal I/O modules (Default: DI-4 assigned to ACK). When the ACK button

or the assigned digital input is closed, all relays programmed for manual

reset are acknowledged.

+5 I1 I2 I3 I4 O1 O2 O3 O4 G

DO 1-4

GND

ACK

PDA1044 Digital I/O Module

12345678910

DI 1-4

Figure 18. Acknowledge Relays w/Function Key or Digital Input

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 95 96

No comments

Precision-digital PD6000 User Manual Page 58