NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
198
BU 0200 en-US-4920
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P533
Factor I
2
t Motor
(factor I
2
t motor)
S
50 ... 150 %
{ 100 }
The motor current for the I
2
t motor monitoring P535 can be weighted with the parameter P533.
Larger factors permit larger currents.
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P534
[-01]
[-02]
Torque disconnection limit
(Torque disconnection limit)
S
P
0 ... 400%/401
{ all 401 }
Via this parameter both the
motoring
[-01] and the
regenerative
[-02] switch-off value can be
adjusted.
If 80 % of the set value is reached, a warning status is set. At 100 % switch-off is performed with
an error message.
Error 12.1 is given on exceeding the drive switch-off limit and 12.2on exceeding the generator
switch-off limit.
[01] =
motoring limit
[02] =
regenerative limit
401 =
OFF,
means that this function has been disabled.
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P535
I
2
t motor
(I
2
t motor)
0 … 24
{ 0 }
The motor temperature is calculated depending on the output current, the time and the output
frequency (cooling). If the temperature limit value is reached then switch off occurs and error
message E002 (motor overheating) is output. Possible positive or negative acting ambient
conditions cannot be taken into account here.
The I
2
t motor function can be set in a differentiated manner. 8 characteristic curves with three
different triggering times (<5 s, <10 s and <20 s) can be set. The trigger times are based on
classes 5, 10 and 20 for semiconductor switching devices. The recommended setting for standard
applications is P535=5.
All curves run from 0 Hz to half of the nominal motor frequency (P201). The full nominal current is
available from half of the nominal frequency upwards.
With multi-motor operation the monitoring must be disabled.
I²t motor off
Monitoring is inactive
Switch off class 5,
60 s at (1.5 x I
N
x P533)
Switch off class 10,
120 s at (1.5 x I
N
x P533)
Switch off class 20,
240 s at (1.5 x I
N
x P533)
I
N
at 0 Hz
P535
I
N
at 0 Hz
P535
I
N
at 0 Hz
P535
100%
1
100%
9
100%
17
90%
2
90%
10
90%
18
80%
3
80%
11
80%
19
70%
4
70%
12
70%
20
60%
5
60%
13
60%
21
50%
6
50%
14
50%
22
40%
7
40%
15
40%
23
30%
8
30%
16
30%
24
NOTE:
Shut-off classes 10 and 20 are provided for applications with heavy starting.
When using these shut-off classes, it must be ensured that the VFD has a
sufficiently high overload capacity.
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