Chapter 12 Description of Parameter SettingsME300
12.1-12-3
Frequency to Start Switching Pumps
Default: 60.00
Settings 0.00 Hz–FMAX
Time Detected when Pump Reaches the Starting Frequency
Default: 1.0
Settings 0.0–3600.0 sec.
Frequency to Stop Switching Pumps
Default: 48.00
Settings 0.00 Hz–FMAX
Time Detected when Pump Reaches the Stopping Frequency
Default: 1.0
Settings 0.0–3600.0 sec.
This parameter only applies for the master pump.
This parameter only works under fixed quantity control (multi-pump operating at constant
pressure)
When the master pump’s operating frequency ≥ Pr.12-08 and the time elapsed exceeds Pr.12-09,
a slave pump #1 will be activated. If the quantity of water is still insufficient, slave pump #2 and
#3 will be activated under the same conditions.
If the master pump’s operating frequency ≤ Pr.12-10 and the time elapsed exceeds Pr.12-11,
slave pump #1 stops. If the master pump still satisfies those conditions, then the slave pump #2
and #3 stop consecutively, the master pump remains in operation.
The run or stop of the master pump depends on the automation stop function.
Pump’s Frequency at Time-out (Disconnection)
Default: 0.00
Settings 0.00–FMAX
This parameter only applies for slave pumps.
Refer to Pr.09.02 COM1 transmission fault treatment and Pr.09.03 COM1 time-out detection for
the conditions to disconnect communication and treatment.
If there is a time-out occurred under fixed quantity control (multi-pump operating at constant
pressure) and a slave pump’s time-out frequency = Pr.12-12, that slave pump is in stand-alone
mode after stop command is given.
The master pump has the function to redetect if a slave pump is time-out.
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