Endress+Hauser RIA452 Betriebsanleitung Seite 87

RIA452
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Endress+Hauser
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. 20: 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
the time which pump was out of operation the longest.
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.
The following parameters must be configured for the example above:
Menu
LIMIT 1 to 3/M10 to 12
24-hour activation function
Pumps with long downtimes can be activated cyclically with the 24-hour activation function for the
time defined in Sw. period.
The starting time for the 24-hour step interval can be postponed with the Sw. delay setting.
Mode Max
With alternating pump control
Without alternating pump control
Relay currentless
Function (menu item)
Each: setpoint A
Each: hysteresis
Each: alternate
Commissioning
Setting value
Value for threshold
Value for hysteresis
Yes
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