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vacon • 27
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 I
ue. If other than nominal motor is used with the drive, the accuracy of the torque calculation
decreases.
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 thermal protection functions.
Code
Parameter
Response to 4mA
P9.1
reference fault
4mA fault detection
P9.2
P9.3
Earth fault protection
P9.4
Motor stall protection
P9.5
Motor stall delay
P9.6
Motor stall min freq
P9.7
Underload protection
Underload load curve
P9.8
at nominal freq
Underload load curve
P9.9
at zero freq
P9.10
Underload time
Thermal protection of
P9.11
Motor ambient
P9.12
temperature
Motor cooling factor at
P9.13
Motor thermal time
P9.14
2
are used to find the scaling ratio for the internal torque val-
L
Min
0
(< 4mA)
0.0
time
0
0
0.0
0.10
0
10.0
5.0
1.0
0
the motor
-20
0.0
zero speed
1
constant
Table 14. Protections settings.
Max
Unit
Default
4
1
10.0
s
0.5
2
2
2
1
300.0
s
5.0
320.00
Hz
15.00
2
0
150.0
%
50.0
150.0
%
10.0
300.0
s
20.0
2
2
100
°C
40
150.0
%
40.0
200
min
45
Description of Groups
ID
Description
0 = No action
1 = Warning
700
2 = Fault
3 = Warning if Start active
4 = Fault if Start active
1430 Time limit
0 = No action
703
1 = Warning
2 = Fault
709
See P9.3
This is the maximum time
711
allowed for a stall stage.
For a stall state to occur, the
output frequency must have
712
remained below this limit for
a certain time.
713
See P9.3
This parameter gives the
value for the minimum
714
torque allowed when the out-
put frequency is above the
field weakening point.
This parameter gives value
715
for the minimum torque
allowed with zero frequency.
This is the maximum time
716
allowed for an underload
state to exist.
704
See P9.3
705
Ambient temperature in °C
Defines the cooling factor at
zero speed in relation to the
706
point where the motor is run-
ning at nominal speed with-
out external cooling.
The time constant is the time
within which the calculated
707
thermal stage has reached
63% of its final value.
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