Front Panel Leds; Latching And Non-Latching Relay Operation - Bindicator PRD1000 Instruction Manual

PRD1000 Analog Input Process Meter

Front Panel LEDs

The LEDs on the front panel provide status indication for the following:
LED
1
2
3
4
The meter is supplied with four alarm points that include front panel
LEDs to indicate alarm conditions. This standard feature is particularly
useful for alarm applications that require visual-only indication. The
LEDs are controlled by the set and reset points programmed by the
user. When the display reaches a set point for a high or low alarm, the
corresponding alarm LED will turn on. When the display returns to the
reset point the LED will go off. The front panel LEDs respond differently
for latching and non-latching relays.
For non-latching relays, the LED is always off during normal condition
and always on during alarm condition, regardless of the state of the
relay (e.g. Relay acknowledged after alarm condition).
For latching relays, the alarm LEDs reflect the status of the relays,
regardless of the alarm condition. The following tables illustrate how the
alarm LEDs function in relation to the relays and the acknowledge
button (Default: F3 key assigned to ACK):

Latching and Non-Latching Relay Operation

The relays can be set up for latching (manual reset) or non-latching
(automatic reset) operation.
The On and Off terminology does not refer to the status of the relay's
coil, which depends on the fail-safe mode selected.
In latching relay mode, latched relays will reset
Warning!
(unlatch) when power is cycled.
Status
Alarm 1
Alarm 2
Alarm 3
Alarm 4
Relay terminology for following tables
Terminology
On
Off
Ack
LED
5
6
7
8
Relay Condition
Alarm (Tripped)
Normal (Reset)
Acknowledged
55
Instruction Manual
Status
Alarm 5
Alarm 6
Alarm 7
Alarm 8