DFM-6301 Models
Program Output
25
Front Panel LEDs
The LEDs on the front panel provide status indication for the following:
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
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 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.
Relay terminology for following tables
Terminology
Relay Condition
On
Alarm (Tripped)
Off
Normal (Reset)
Ack
Acknowledged
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.
