ProtEX-MAX PD8-6060 Explosion-Proof Dual-Input Meter Instruction Manual
40
Front Panel LEDs
The LEDs on the front panel provide status indication for the
following:
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 responds 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 reflects 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.
Warning!
In latching relay mode, latched relays
will reset (unlatch) when power is
cycled.
Non-Latching Relay (
Auto
)
In this application, the meter is set up for automatic reset
(non-latching relay). Acknowledging the alarm while it is still
present has no effect on either the LED or the relay. When
the alarm finally goes away, the relay automatically resets
and the LED also goes off.
Non-Latching Relay (
A-man
)
In this application, the meter is set up for automatic and
manual reset at any time (non-latching relay). The LED and
the relay automatically reset when the meter returns to the
normal condition.
The next time an alarm occurs, the operator acknowledges
the alarm manually while the alarm condition still exists.
This causes the relay to reset, but the LED stays on until
the meter returns to the normal condition.
Latching Relay (
LatcH
)
In this application, the meter is set up for manual reset at any
time. Acknowledging the alarm even if the alarm condition is
still present resets the relay and turns off the LED.
LED Status
LED
Status
1
Alarm 1
5
Alarm 5
2
Alarm 2
6
Alarm 6
3
Alarm 3
7
Alarm 7
4
Alarm 4
8
Alarm 8
Relay terminology for following tables
Terminology
Relay Condition
On
Alarm (Tripped)
Off
Normal (Reset)
Ack
Acknowledged
Automatic reset only
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Ack (No effect)
On
On
Normal
Off
Off
Aut manual reset at any time
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Normal
Off
Off
Next Alarm
On
On
Ack
On
Off
Normal
Off
Off
Manual reset any time
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Ack
Off
Off
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