Endress+Hauser RIA452 Mode D'emploi page 122

Commissioning
Alternate
Measured value
Setpoint A 3
Setpoint A 3
- Hysterese 3
Setpoint A 2
Setpoint A 2
- Hysterese 2
Setpoint A 1
Setpoint A 1
- Hysterese 1
Switching status
Relay 3
Relay 2
Relay 1
Switching status
Relay 3
Relay 2
Relay 1
Fig. 19: Alternating pump control
Alternate switching is used to ensure that several pumps are utilized evenly in level control
systems. The main factor for switching on a certain pump is not a fixed assigned switch-on value
but rather which pump has the shortest operation time.
In total, the first 4 relays (LIMIT 1 to 4) can be included in the alternating pump control system.
!
Note!
Relays not included in alternating pump control are available.
This function cannot be applied to individual relays. Relays not included are not assessed based
on the switch-on and switch-off duration.
122
Mode Max
With alternating pump control
Without alternating pump control
Relay currentless
RIA452
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t
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G09-RIA452ZZ-15-00-xx-en-007
Endress+Hauser