Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 80)

80
0555
0555 SWITCH INTV
24 hours
Switch interval for cyclic changeover
(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, in order 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 2
nd pump starts, when the 1 st 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 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 control
Possible settings: 0 .0 Hz - Max. frequency
This parameter is used for switching off the first assist pump in synchronous mode. So if
the frequency of both pumps drops below this selected value, the first assist pump
stops.
0565
0565 SYNCHR. WND.
2.0 Hz
Frequency window for synchronous control
Possible settings: 0.0 – 10 Hz
Frequency limit for switching off the next assist pump.
E.g. switching off the 3 rd pump:
All 3 pumps are running at a frequency < SYNCHR. LIM. [0560] + SYNCHR. WIN. [0565]
or: switching off the 4 th pump:
All 4 pumps are running at a frequency < SYNCHR. LIM. [0560] + 2x SYNCHR. WIN. [0565]
S
S
S
G
G
G