P
RO
V
U
™ PD7000 Temperature Meter
Instruction Manual
24
High Alarm with Fail-Safe
Operation (Set > Reset)
Note: Relay coil is energized in non-alarm condition. In case of power failure,
relay will go to alarm state.
Low Alarm with Fail-Safe
Operation (Set < Reset)
Note: Relay coil is energized in non-alarm condition. In case of power failure,
relay will go to alarm state.
Relay Sampling Operation
When the signal crosses the set point, the relay trips
and the sample time starts. After the sample time has
elapsed, the relay resets. The cycle repeats every
time the set point is crossed, going up for high alarms
and going down for low alarms.
The sample time can be programmed between 0.1
and 5999.9 seconds.
Signal Loss or Input Break Relay
Operation
The following graph shows the input break relay
operation for a high alarm relay.
When the meter detects a break in the input, the relay
will go to one of the following selected actions:
1. Turn
On
(Go to alarm condition)
2. Turn
Off
(Go to non-alarm condition)
3. Ignore (Processed as an upscale condition)
