Inovance H0U-88B1G - Page 53

Phenomenon Possible Cause Checking Item Handling Method
modifications.
Parameter
Identification
by inverter is
not correct.
Perform parameter
identification at zero
load of the motor
Air outlet
pressure is not
stable
The Kp of
pressure PID is
not set properly or
Ti is not set
properly.
Check whether
there is a great
difference of
Kp and Ti and
factory
settings.
Properly decrease
Kp (less than 2.0).
Properly increase Ti
(1.0-2.0 seconds).
In MDI drive
mode, the intake
pressure seems
not to be affected
by “Unloading
pressure” and
“Loading
pressure”.
When the main motor is in the MDI drive mode, the air outlet
pressure keeps stable around the “Preset air outlet
pressure”.
“Unloading pressure” and “Loading pressure” take effect
only when the main motor is in the power-line drive mode.
Frequently turn
on and turn off the
intake valve.
The “Upper limit of
intake pressure” is
close to the preset
pressure, or the
PID parameter
setting is too
sensitive.
Properly increase
the “Upper limit of
intake pressure”, or
properly decrease
the Kp value.
The screw
compressor does
not enter the
sleep mode, or
frequently sleeps
and awakes
The “Sleep mode
awaking pressure”
is close to the
preset pressure.
”Properly decrease
the “Sleep mode
awaking pressure”.
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