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Fan:
Usually, the motor current is measured in "star".
Overload and blocked rotor protection:
Blocked rotor and overload protections are not enabled simultaneously!
During motor startup, the locked rotor protection is enabled for the period set in parameter P14.04. After this period, the blocked rotor protection
is disabled and the overload protection is then enabled
Blocked rotor protection (improves motor protection at starts):
The blocked rotor protection will go to the main motor immediately if the current reaches the maximum limit. This protection has an operating
time of 2 seconds to avoid false errors.
The following method is only a guide for parameterizing P14.05 (in you have any questions, consult a specialist).
Typical values are between 2.5 and 4. A simple method to adjust the value of this parameter is to gradually reduce the factor until the blocked
rotor error occurs (the motor must be cold for this setting). With this value set, add 1 to the value found to compensate for variations.
Overload protection (continuous protection):
After the "star-delta" start period, overload protection of the main motor is activated. Similarly, after the fan motor acceleration time, the motor
overload protection is also enabled.
It is not necessary to set the overload protection characteristics because the interface performs the protection based on the rated current value
as follows:
Undercurrent Detection:
No setup is required for undercurrent! After 2 seconds, the interface monitors the current in any operating status. If the measured current falls
below 20% of the rated current, the interface will understand that there is an abnormal error and stop the compressor immediately.
Note: 20% is high enough to filter out any noise and low enough to avoid false errors (e.g. no load).
2 seconds
Overload protection
Overload (x times rated motor current)
2 seconds
Blocked rotor
protection level
(Parameter P14,05)
Active overload protection
Table 8.6.4 - Overload protection
Overload factor
217
Time [s]
1,2
60
1,3
48
1,5
24
1,6
15
2
5
3
1
4
0,25
5
0,1
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