Latching Relay (Lt-Clr); Acknowledging Relays; Figure 16. Acknowledge Relays W/Function Key - Bindicator PRD1000 Instruction Manual

PRD1000 Analog Input Process Meter

Latching Relay (Lt-Clr)

Manual reset only after alarm condition has cleared
Condition
Normal
Alarm
Ack (No effect)
Normal
Ack
In this application, the meter is set up for manual reset only after the
signal passes the reset point (alarm condition has cleared).
Acknowledging 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
because, 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:
1. Via the programmable front panel function keys F1-F3 (Default:
F3 assigned to ACK).
2. Remotely via a normally open pushbutton wired across the F4
digital input, which is triggered with a contact closure to COM,
or with an active low signal (see page 24).
When the ACK button or the assigned digital input is closed, all relays
programmed for manual reset are acknowledged.

Figure 16. Acknowledge Relays w/Function Key

LED Relay
Off Off
On On
On On
On On
Off Off
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Instruction Manual