Siemens SITRANS 7ME3500, Operating Instructions Manual, Page: 115 / 296

Functions
7.5 Setting Relays
FUE1010 IP65 NEMA 4X
Operating Instructions, 12/2014, A5E03086491-AC
113
Reflexor Zero/Fault Option (Reflexor Mode Only)
Note
The [Zero/Fault set] menu option only appears on the display if the selected channel is the
Reflexor mode.
The Reflexor declares a Fault when the receive signal drops below the Doppler detection
threshold. To change the Reflexor response to a Zero Flow indication rather than a Fault,
select [Zero] in the [Zero/Fault Set] menu option. Note the following:
1.
FAULT – When selected the system will declare the Reflexor channel to be in Fault and
the flow meter will indicate "F" on the display screen. Note that when a new Reflexor
channel is created the [Fault] option is the default mode. Also note that the sum (or
difference) channel will also be declared to be in Fault.
2. ZERO – When selected the Reflexor channel will be declared to be at Zero Flow instead
of in Fault and the flow meter will indicate 0.00 on the display screen.
7.5 Setting Relays
Relay Functions
Use the [Relay Setup] menu to assign a function to channel relays. The flow meter supports
two types of relay outputs, Alarm Relay and Pulse Relay. Alarm Relay outputs operate in
"fail-safe" mode. The relay(s) are energized under normal conditions - an alarm condition
causes the relay(s) to de-energize until the alarm clears. The Pulse Relay output supports
Totalizer and batch relay functions, with an output pulse width of approximately 200 ms;
maximum activation rate is 2.5 pulses per sec. If Totalizer pulses exceed this rate, excess
pulses are stored in an overflow register. This allows the relay to "catch up" when flow
decreases enough.
Note
Using the <F1> key (Totalizer clear command) also clears all channel Totalizers plus the
overflow register described in the last paragraph.
Relay 1 and 2 Function Assignments
The flow meter, depending upon the model, provides at least two alarm relays. Please refer
to the Appendix for wiring details. Relays respond to any of the alarm conditions or data
functions included on the Relay Option List.