Siemens 7ME3510, Руководство по эксплуатации, Страница: 91 / 214

Functions
7.5 Setting Relays
FUP1010 IP67 Portable
Operating Instructions, 03/2012, A5E02951522-02
89
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 (Page 143) for wiring details. Relays respond to any of the alarm conditions
or data functions included on the Relay Option List.
Table 7- 4 Relay Option List
Not Used Not Active
Power Off Power Off alarm occurs when power fails.
High Temp High temperature value relay trip-point.
Low Temp Low temperature value relay trip-point.
High Flow System flow rate exceeds high flow set point.
Low Flow System flow rate falls below low flow set point.
Flow Alarm System flow rate exceeds or falls below flow set points.
Fault Alarm System loses receive signal (all paths in fault).
Soft Fault Fault condition - memory mode active.
Spacing System sensor spacing needs adjusting.
Empty Empty pipe alarm.
Aeration Aeration percentage exceeds alarm set point.