Vertu Series VPM3000 Process Meters & Temperature Transmitters
Instruction Manual
23
Setting Fail-Safe Operation
The fail-safe operation is set independently for each
relay. Select
on
to enable or select
off
to disable fail-
safe operation.
Programming Time Delay
The
On
and
Off
time delays may be programmed for
each relay between 0 and 199 seconds. The relays
will transfer only after the condition has been
maintained for the corresponding time delay.
The
On
time delay is associated with the set point.
The
Off
time delay is associated with the reset point.
Setting Sensor Break Condition
The sensor break relay condition may be
programmed for each relay as
On
(alarm) or
Off
(non-alarm). The relays will enter these states when
a sensor break is detected for RTD or thermocouple
inputs. These settings have no effect when current or
voltage inputs are selected.
Sensor Break Operation
The following graphs illustrate the operation of how
the meter reacts when a sensor break is detected.
Relay and Alarm Operation
The following graphs illustrate the operation of the
relays, status LEDs, and ACK button.
High Alarm Operation (Set > Reset)
For Manual reset mode, ACK can be pressed anytime
to turn "off" relay. For relay to turn back "on", signal
must go below set point, and then go above it.
