Latching Relay (Lt-Clr); Acknowledging Relays; Figure 19. Acknowledge Relays W/Function Key Or Digital Input - FlowLine DataView LI55 Instruction Manual

DataView™ LI55 Level Controller

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:
ENTER key).
2. Remotely via a normally open pushbutton or active low signal wired
across the F4 and COM terminals (see page 24).
When the ENTER button or the assigned digital input is closed, all relays
programmed for manual reset are acknowledged.

Figure 19. Acknowledge Relays w/Function Key or Digital Input

66
◄ F1
◄ F2
◄ F3
LED Relay
Off Off
On On
On On
On On
Off Off
Instruction Manual
MN301033 Rev B1