76
0550
0550 OVERVAL DLY
0 sec
Overvalue Delay
Possible settings: 0.0 – 10.0 sec
Delay time to switch-off a follow-up-pump in case the actual value exceeds the
OVERVALUE [0545] Limit.
0555
0555 SWITCH INTV
24 hours
Switch Interval for cyclic changeover
(For Cascade Serial only!)
Possible settings: 0 – 250 hours
This parameter allows an automatic change over of the master pump and the following
pumps, in order to provide even wear and achieve even operating hours of the pumps.
The Switch Interval is valid for HYDROVAR Master Inverters only (connected via the RS-485
interface) and using operation mode Cascade Serial.
Synchronous Control
By using the synchronous control mode all pumps in the system maintain the set
pressure by running at the same frequency.
The 2
nd
pump starts, when the 1
st
pump reaches the ENABLE FRQ. [0515] the system and
pressure drops below ACTU.VAL.DEC. [0510] -> both pumps will run synchronously.
The follow-up pump will stop, when the frequency drops below the set SYNCHR. LIMIT
[0560]. This function creates a hysteresis effect which prevents the follow-up pump
against a frequent on/off operation.
To find out the right setting:
• Start the first pump in JOG Mode [62]; Increase the frequency till you reach the required
value. Check the frequency ( = f
0
) at zero consumption
• Set the synchronous limit (f
0
+ 2..3 Hz)
• Set the synchronous window between 1 or 2 Hz
(depending on the pump curve and set point).
0560
0560 SYNCHR. LIM.
0.0 Hz
Frequency limit for synchronous regulation
Possible settings: 0 .0 Hz - Max. Frequency
This parameter is used for switching off the first follow-up pump in synchronous mode.
So if the frequency of both pumps goes below this selected value, the first follow-up
pump stops.
S
S
S
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