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36 Unidrive M100 User Guide
Issue Number: 1
N
The nominal output cable sizes assume that the motor maximum current matches that of the drive. Where a motor of reduced rating is used the cable
rating may be chosen to match that of the motor. To ensure that the motor and cable are protected against overload, the drive must be programmed
with the correct motor rated current.
A fuse or other protection must be included in all live connections to the AC supply.
Fuse types
The fuse voltage rating must be suitable for the drive supply voltage.
MCB
Do not use an MCB instead of the recommended fuses.
Ground connections
The drive must be connected to the system ground of the AC supply. The ground wiring must conform to local regulations and codes of practice.
N
For information on ground cable sizes, refer to Table 4-1 Protective ground cable ratings on page 32.
4.3.1 Main AC supply contactor
The recommended AC supply contactor type for size 1 to 4 is AC1.
4.4 Output circuit and motor protection
The output circuit has fast-acting electronic short-circuit protection which limits the fault current to typically no more than 2.5 times the rated output
current, and interrupts the current in approximately 20 µs. No additional short-circuit protection devices are required.
The drive provides overload protection for the motor and its cable. For this to be effective, Rated Current (00.006) must be set to suit the motor.
4.4.1 Cable types and lengths
Since capacitance in the motor cable causes loading on the output of the drive, ensure the cable length does not exceed the values given in
Table 4-9, Table 4-10 and Table 4-11.
Use 105 °C (221 °F) (UL 60/75 °C temp rise) PVC-insulated cable with copper conductors having a suitable voltage rating, for the following power
connections:
• AC supply to external EMC filter (when used)
• AC supply (or external EMC filter) to drive
• Drive to motor
• Drive to braking resistor
Table 4-9 Maximum motor cable lengths (100 V drives)
Motor Rated Current (00.006) must be set correctly to avoid
a risk of fire in the event of motor overload.
Model
100 V Nominal AC supply voltage
Maximum permissible motor cable length for each of the following switching frequencies
0.667 kHz 1 kHz 2 kHz 3 kHz 4 kHz 6 kHz 8 kHz 12 kHz 16 kHz
01100017
50 m (164 ft)
37.5 m
(123 ft)
25 m
(82 ft)
18.75 m
(61 ft)
12.5 m
(41 ft)
9 m
(30 ft)
01100024
02100042
100 m (328 ft)
75 m
(246 ft)
50 m
(164 ft)
37.5 m
(123 ft)
25 m
(82 ft)
18 m
(59 ft)
02100056
NOTE
NOTE
WARNING