INVT Goodrive270 Series Operation Manual page 150

Goodrive270 series VFD for fan and pump
Function
code
P94.35
Manual polling
Manual polling is used for testing to check whether the main circuit wiring and control circuit wiring are
correct and motors can run properly. If polling is completed or terminated, a stop command must be
given so that the next polling mode can be entered after restart.
The function is implemented as follows: When the VFD is in stopped stated, set the terminal input
function to 85 (Manual polling), enable the terminal function, and then send a startup command. The
VFD starts all connected motors from motor M1 in polling mode. During polling, all motors are started
by means of adding motors in sequence. When all motors have been started, motors are
automatically reduced in sequence until the end.
Note: During polling, if the enabling signal of an S terminal is canceled, the polling persists until the
end. If you want to terminate the polling, you need to trigger a stop signal.
5.5.16.3 Water pump maintenance
You can set the S digital input terminal functions to 104–107 to lock motors M1–M4, which will not be
under multi-pump control. You only need to disconnect the motor wiring contactors from the grid to
maintain the pumps, without adjusting the onsite wiring.
5.5.16.4 Smooth switchover
When a motor switches from the variable-frequency run mode to the power-frequency run mode, the
water pressure fluctuates greatly. You can set P94.22 (Switching frequency for variable-frequency
motor adding) to enable the motor runs from a high switching frequency to the power-frequency run
mode, preventing the water pressure from dropping too quick so as to ensure water pressure steady.
Related function codes:
Function
code
Switching frequency
P94.22 for variable-frequency
5.5.16.5 Fixed variable-frequency run mode
The fixed variable-frequency control logic is relatively simple. The following assumes one VFD drives
four motors in fixed variable-frequency run mode. Se the following parameters.
Name
P00.05–P00.03
Running When the running frequency is greater
frequency than the value of this function code,
threshold for variable-frequency motor polling is not
polling performed. Otherwise, great water
pressure change impacts water supply.
Name
motor adding
Description
Description
P00.05 (Lower limit
frequency)–P00.03
-140-
Basic operation guidelines
Default Modify
○
45.00Hz
Default Modify
○
50.00Hz