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36 • vacon description of parameters
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2.8.9 Motor thermal protection: Motor duty cycle
Defines how much of the nominal motor load is applied.
The value can be set to 0%…100%.
Figure 15. Motor temperature calculation
Parameters 2.8.10-2.8.13, Stall protection:
General
The motor stall protection protects the motor from short time overload situations such as one
caused by a stalled shaft. The reaction time of the stall protection can be set shorter than that of
motor thermal protection. The stall state is defined with two parameters,
2.8.11 (Stall current) and
2.8.13 (Stall frequency). If the current is higher than the set limit and output frequency is lower
than the set limit, the stall state is true. There is actually no real indication of the shaft rotation.
Stall protection is a type of overcurrent protection.
2.8.10 Stall protection
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to
parameter 2.4.2
3 = Fault, stop mode after fault always by coasting
Setting the parameter to 0 will deactivate the protection and reset the stall time
counter.
1 0 5 %
par. 2.8.3.1
Θ
= (I/I
T
)
2
x (1-e
-t/T
)
I / I
T
NX12k82
T r i p a r e a
M o t o r t emp e r a t u r e
Time M o t o r t e m p erature
Time constant T
*)
*)
Changes by motor size and
adjusted with parameter 2.8.8.
Fault/warning
M o t o r
c u r r e n t