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Model PD690 Universal Process Meter
Instruction Manual
29
Alarm Acknowledgment
The ACK button on the front panel resets the optional relays only and
has no effect on the alarm status LEDs.
Automatic & Manual Reset Programming
There are two ways to reset the relays:
1. Automatically when the signal passes through the reset point.
2. Automat manually via the front panel ACK button, or a user
supplied momentary Normally Open push-button across terminals
AK and CM at the rear of the instrument. That is, a relay may be
manually reset prior to the signal passing through the reset point
or it will automatically reset when the signal passes through the
reset point.
A manual reset will reset all relays that are programmed for
aut manual reset.
Figure 14: Relay Reset & Fail-Safe Jumpers
An array of jumpers located behind the front panel on the Display
Board is used to program each relay for either automatic or automatic
+ manual reset. Refer to page 32 for front panel removal instructions.
The top jumper is used for relay 1, the next for relay 2, etc. A relay
will automatically reset if no jumper is installed. A relay will automati-
cally reset, plus can be manually reset, if a jumper is installed over its
respective pins.
Example Above:
Relay 1 is programmed for automatic reset;
Relays 2, 3, & 4 are programmed for aut manual reset.
1
2
3
4
ACK ENABLE
JUMPERS
FAIL-SAFE
JUMPER
JP6
JP3
SOLDER
PADS
