Honeywell NXL Series Applications Manual page 44

Page 44 (68)
Figure 1- 19. Motor temperature calculation
2.7.10 Motor thermal protection: Motor duty cycle
Defines how much of the nominal motor load is applied.
The value can be set to 0%...100%.
Parameter 2.7.11, 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, 2.7.12 (Stall current) and 2.7.13 (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.
2.7.11 Stall protection
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to parameter 2.1.9
3 = Fault, stop mode after fault always by coasting
Setting the parameter to 0 will deactivate the protection and reset the stall time counter.
4
Description of parameters
Mot o r t e m p e r a t u r e
1 0 5 %
M oto r
c urre n t
I /I
T
M otor temperature
Trip area
*)
Time constant T
2 -t/T
Θ = (I/I
) x (1-e
T
*)
Changes by motor size and
adjusted with parameter 2.7.9
Honeywell
Fault/warning
par. 2.7.6
)
Tim e
NX12k8 2