Siemens SITRANS FUS1020, Manual, Page: 174 / 251

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1020NFM-1D Section 6
To assign functions to Relay 1:
To access the [Relay 1] option list press the <Right Arrow>.
Move the cursor to the desired relay assignment by pressing the <Up/Down Arrow>.
To store selection press <ENTER>.
Assigning Relay 1 Functions
The 1020 provides one alarm relay. Please refer to the appropriate Installation Drawing in Appendix B
for wiring details. Relays respond to any of the alarm conditions/data functions included on the [Relay
1] option list.
6.9.2 RELAY SETUP
Use this menu to assign a function to channel relays. System 1020 supports 2 types of relay outputs,
Alarm Relay and Pulse Relay. Alarm Relay outputs operate in “fail-safe” mode. The relay(s) are ener-
gized under normal conditions - an alarm condition causes the relay(s) to de-energize until alarm
clears. The Pulse Relay output supports totalizer and batch relay functions. The output pulse width is
approximately 200 ms; maximum activation rate is .5 pulse per second. If totalizer pulses exceed this
rate, excess pulses are stored in overflow register. This allows the relay to “catch up” when flow de-
creases enough.
NOTE: The Reset Totalizer [Yes/No] menu command clears all channel totalizers plus the
overflow register described in the last paragraph.
Not Used Not Active
Power Off Power Off alarm occurs when power fails
High Flow Flow rate exceeds high flow setpoint
Low Flow Flow rate falls below low flow setpoint
Flow Alarm Flow rate exceeds or falls below flow setpoints
Fault Alarm System loses receive signal
Soft Fault Fault condition - memory mode active
Spacing Transducer spacing needs adjusting
Empty Empty pipe alarm
Aeration Aeration percentage exceeds alarm setpoint
Reverse Flow Flow is in negative direction
BatchTot Batch/Sample total advances
Interface Liquid interface setpoint exceeded
Pos Total Positive total volume advances by 1 digit
Neg Total Negative total volume advances by 1 digit
Fltwarn System fault warning
Relay 1 Option List