Rockwell Automation 931S-V1R1D-MC1R Isolator, Monitoring - Manual (Page 4)

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2. Function description
2.1 The 3 Way Monitoring Isolator 931S-V1R1D-MC1R monitors
24Vac/dc to 260Vac/dc voltage in single-phase power supply
systems. This voltage range can be divided into 4 individual ranges.
Power is supplied via the monitoring input. A relay with changeover
contact is used for the switching output. Fundamentally, the device
works on a closed-circuit current principle; that means that the
relay picks up by status OK, and drops out when an alarm is
signalled.The switching point is set via a potentiometer (located
under the front plastic cover).
Functions:
- High Trip: The relay switches when the set operating
point is exceeded
- Low Trip: The relay switches by underflow of the set
operating point
- Memory on: The output alarm status is retained; it can
be reset via an internal pushbutton or
external reset input
- Memory off: The alarm status is not stored
- Hysteresis, small: Pickup and release delay of 5V/8V
depends on the range set
- Hysteresis, large: Pickup and release delay of 10V/16V
depends on the range set
- AC voltage: AC voltage measurement of the input
signal
- DC voltage: DC voltage measurement of the input
signal