Parameters
vacon • 90
Service support: find your nearest Vacon service center at www.vacon.com
6
6.1.10.4
Group 3.9.4: Motor Underload
The purpose of the motor underload protection is to ensure that there is load on the motor
when the drive is running. If the motor loses its load there might be a problem in the process,
e.g. a broken belt or a dry pump.
Motor underload protection can be adjusted by setting the underload curve with parameters
P3.9.4.2 (
Underload protection: Field weakening area load
) and P3.9.4.3 (
Zero frequency
load
). The underload curve is a squared curve set between the zero frequency and the field
weakening point. The protection is not active below 5Hz (the underload time counter is
stopped).
The torque values for setting the underload curve are set in percentage which refers to the
nominal torque of the motor. The motor's name plate data, parameter motor nominal current
and the drive's nominal current IH are used to find the scaling ratio for the internal torque val-
ue. If other than nominal motor is used with the drive, the accuracy of the torque calculation
decreases.
NOTE!
If you use long motor cables (max. 100m) together with small drives (
≤
1.5
kW) the motor current measured by the drive can be much higher than the actual
motor current due to capacitive currents in the motor cable. Consider this when
setting up the motor underload protection functions.
Table 75. Motor underload protection settings
Code
Parameter
Min
Max
Unit
Default
ID
Description
P3.9.4.1
Underload Flt
0
3
0
713
0 = No action
1 = Alarm
2 = Fault (Stop according to
stop mode)
3 = Fault (Stop by coasting)
P3.9.4.2
Fieldweak. Load
10.0
150.0
%
50.0
714
This parameter gives the
value for the minimum
torque allowed when the out-
put frequency is above the
field weakening point.
P3.9.4.3
Zero Freq. Load
5.0
150.0
%
10.0
715
This parameter gives value
for the minimum torque
allowed with zero frequency.
If you change the value of
parameter P3.1.1.4 this
parameter is automatically
restored to the default value.
P3.9.4.4
2.00
600.00
s
20.00
716
This is the maximum time
allowed for an underload
state to exist.
13006.emf
Содержание 100X series
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