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Programming
0555
0555 SWITCH INTV Switch interval for lead / lag alternation
24 hours (for cascade serial / synchron only!)
Possible settings: 0 – 250 hours
This parameter allows an automatic change over of the master pump and the assist pumps, to provide
even wear and achieve even operating hours of the pumps.
The switch interval is used for HYDROVAR Master Inverters only (connected via the RS-485 interface) by
using operation mode Cascade Serial or Cascade Synchron.
Synchronous Control
By using the synchronous control mode all pumps in the system maintain the set pressure by running at
the same frequency.
The 2nd pump starts, when the 1st pump reaches the ENABLE FRQ. [0515] and the system pressure drops
below ACTU. VAL. DEC. [0510] -> both pumps will run synchronously.
The assist pump will stop, when the frequency drops below the set SYNCHR. LIMIT [0560]. This function
creates a hysteresis effect which prevents the assist pump against a frequent on/off operation.
To determine the correct setting:
• Start the rst pump in JOG Mode [62]; Increase the frequency till you reach the required value. Check
the frequency ( = f0 ) at zero consumption
• Set the synchronous limit (f0 + 2..3 Hz)
• Set the synchronous window between 1 or 2 Hz (depending on the pump curve and set point).
0560
0560 SYNCHR. LIM.
Frequency limit for synchronous control
0.0 Hz
Possible settings: 0 .0 Hz - Max. frequency
This parameter is used for switching off the first assist pump in synchronous mode. If the frequency of
both pumps drops below this selected value, the first assist pump stops.
0565
0565 SYNCHR. WND.
Frequency window for synchronous control
2.0 Hz
Possible settings: 0.0 – 10 Hz
Frequency limit for switching off the next assist pump.
E.g. switching off the 3RD PUMP:
All 3 pumps are running at a frequency < SYNCHR. LIM. [0560] + SYNCHR. WIN. [0565]
Or: switching off the 4TH PUMP:
All 4 pumps are running at a frequency < SYNCHR. LIM. [0560] + 2x SYNCHR. WIN. [0565]
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