Endress+Hauser RIA452 Manuel De Mise En Service page 73

RIA452
!
Endress+Hauser
The following parameters must be configured:
Menu
LIMIT 1...8/M10...17
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 utilised 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 question as to which pump was out of operation the longest.
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...3/M10...12
Function (menu item)
Setpoint A
Hysteresis
Delay
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
Delay time in [s]
t
t
t
Setting value
Value for threshold
Value for hysteresis
Yes
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