Power Connections; Output Short Circuit Protection; Motor Overload Protection - Nidec Power Module Frame 12 Power Installation Manual

Safety information
4.1

Power connections

4.1.1 AC and DC and brake connections
Figure 4-1 Unidrive M frame 12 power connections
4.2

Output short circuit protection

The drive modules are provided with fast-acting electronic short-circuit protection which limits the fault current to typically no more than five times
the rated output current and interrupts the current in approximately 20 μs. No additional short-circuit protection devices are required. Refer to the
Unidrive M700, M701, M702 Control User Guide. CT Part Number: 0478-0353.
4.3

Motor overload protection

The drive modules are provided with overload protection for the motor and the motor cable.
For this to be effective, the drive overload protection parameter 'Rated Current (00.046)' must be set to the rated motor current as marked on the
motor rating plate. For details of how to adjust the drive parameters, refer to the Unidrive M700, M701, M702 Control User Guide. CT Part Number:
0478-0353.
Parameter Pr 00.046 'Motor Rated Current' must be set correctly to avoid a risk of fire in the event of motor overload.
Table 4-1 Typical motor overload limits
Operating mode
Normal Duty overload with motor rated current =
drive rated current
Heavy Duty overload with motor rated current =
drive rated current
* 1240720T rating provides 110 % for 3 s from rated normal duty current. 110 % is available for 10 s when limited to 850 A continuous.
12406600T and 12405660T support 110 % for 10 s.
Generally, the drive rated current is higher than the matching motor rated current allowing a higher level of overload than the default setting. The time
allowed in the overload region is proportionally reduced at very low output frequency on some drive ratings.
NOTE
The maximum overload level which can be attained is independent of the speed.
Unidrive M Frame 12 Power Installation Guide
Issue Number: 1
Product information Mechanical installation
RFC from cold
110 % for 180 s
140 % for 60 s
Electrical Installation
RFC from 100 % Open loop from cold
110 % for 10 s * 110 % for 180 s
140 % for 10 s 140 % for 60 s
Technical data
Open loop from 100 %
110 % for 10 s *
140 % for 10 s
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