Chapter 4 Parameters
VFD-EL-W
4-93
1: Fixed time circulation (alternative operation)
2: Fixed quantity control (multi-pump operating at constant pressure)
When using the multi-pump control mode, you must set Pr.10.35 for each pump to the same value.
10.36
Multi-pump ID
Settings 0–4
0: Multi-pump control mode is disabled
1: Master
2–4: Slave
Default: 0
When using the multi-pump control mode, the settings of each pump for Pr.10.36 cannot be the same.
10.37
Multi-pump’s Fixed Time Circulation Period
Settings 1–65535 minutes Default: 60
This parameter is only valid for master pump settings.
Fixed time circulation mode (alternative operation): Assume that when pump #1’s operating time is longer
than the setting for Pr.10.37, pump #1 stops, and then pump #2 activates, and so on.
Fixed quantity control (multi-pump operating at constant pressure): Assume that when the master pump’s
operating time is longer than the setting for Pr.10.37, the master pump and the slave pump switch
alternatively.
10.38
Frequency to Start Switching Pumps
Settings 0.00 Hz–F
MAX
Default: 60.00
10.39
Time Detected When Pump Reaches the Starting Frequency
Settings 0.0–3600.0 sec. Default: 1.0
10.40
Frequency to Stop Switching Pumps
Settings 0.00 Hz–F
MAX
Default: 48.00
10.41
Time Detected When Pump Reaches the Stopping Frequency
Settings 0.0–3600.0 sec. Default: 1.0
This parameter is only valid for master pump settings.
This parameter is only valid for fixed quantity control (multi-pump operating at constant pressure) mode.
When the master pump’s operating frequency ≥ Pr.10.38, and the time exceeds Pr.10.39, slave pump #1
activates. If the quantity of water is still insufficient, slave pump #2 and #3 activates under the same
conditions.
If the master pump’s operating frequency ≤ Pr.10.40, and the time exceeds Pr.01.41, slave pump #1 stops.
If the master pump can fulfill the conditions, slave pump #2 and #3 stop in sequence, and leave the master
pump in operation only.
Whether the master pump stops depends on the stopping detection function.
10.42
Pump’s Frequency at Time-out (Disconnection)
Settings 0.00 Hz–F
MAX
Default: 0.00
This parameter is only valid for slave pump settings.
For details on the conditions of communication disconnection and treatment, refer to Pr.09.02
Transmission Fault Action and Pr.09.03 Time-out Detection.
If disconnection (time-out) occurs in the fixed quantity control (multi-pump operating at constant pressure)
mode, the frequency for the slave pump is Pr.10.42. When you press the STOP key, the disconnected
slave pump is in single-pump mode. (The RUN command and operating frequency is set by the parameter
settings for the slave pump.)
The master pump can re-detect the disconnection of the salve pump.
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