Precision Digital PD6300 - Manual (Page 64)

Model PD6300 Pulse Input Rate/Totalizer Instruction Manual
64
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). Acknowledg-
ing 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 re-
set:
 Via the programmable front panel function keys F1-F3 (Default:
F3 assigned to ACK)
 Remotely via a normally open pushbutton wired across one of the
digital inputs and the +5 V terminals on the digital I/O modules.
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
1 2 3 4 5 6 7 8 9 10
DI 1-4
Figure 19: Acknowledge Relays w/Function Key or Digital Input