Delta VFD-EL-W Series User Manual

Chapter 4 Parameters｜VFD-EL-W
142
 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.
 This parameter is only valid for master pump settings.

10.38
Pump Switching Start-up Frequency
Default: 60
Settings
0.00 Hz–Fmax

10.39
Pump Reaches Start-Up Frequency Detection Time
Default: 1.0
Settings
0.0–3600.0 sec.

10.40
Pump Switching Stop Frequency
Default: 48.00
Settings
0.00 Hz–Fmax

10.41
Pump Reaches Switching Stop Frequency Detection Time
Default: 1.0
Settings
0.0–3600.0 sec.
 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 master pump operation frequency ≥ Pr.10.38 and the time exceeds the setting in Pr.10.39,
activate the next pump; if the water is still insufficient, activate the third, the forth pump according
to the same conditions.
 When master pump operation frequency ≤ Pr.10.40 and the time exceeds the setting in Pr.10.41,
deactivate the first slave pump; if the master pump still fulfills the conditions, deactivate pump
#2, pump #3 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)
Default: 0.00
Settings
0.0–Fmax
 This parameter is only valid for Slave pump.
 Refer to Pr.09.02 (COM1 transmission fault handling) and Pr.09.03 (COM1 time-out detection)
for the communication failure conditions and fault handling.
 If a disconnection occurs in the fixed quantity control (multi-pump operating at constant
pressure), the frequency command of slave pump is Pr.10.42; the slave pump is in standalone
mode after STOP commend is given. (Set the RUN command and operation frequency by the
slave pump parameters.)
10.43
Pump Fault Treatment
Default: 1
Settings
bit0–bit2
 This parameter is only valid for master pump settings.

Delta VFD-EL-W Series Specifications

General

Brand	Delta
Model	VFD-EL-W Series
Category	DC Drives
Language	English