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74
Affinity User Guide
www.controltechniques.com Issue Number: 5
4.8 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 five times the rated
output current, and interrupts the current in approximately 20µs. No
additional short-circuit protection devices are required.
The drive provides overload protection for the motor and its cable. For
this to be effective, Pr
0.46
Motor rated current
must be set to suit the
motor.
There is also provision for the use of a motor thermistor to prevent over-
heating of the motor, e.g. due to loss of cooling.
4.8.1 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
4-6, Table 4-7 and Table 4-8.
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 4-6 Maximum motor cable lengths (200V drives)
Table 4-7 Maximum motor cable lengths (400V drives)
Table 4-8 Maximum motor cable lengths (575V drives)
Table 4-9 Maximum motor cable lengths (690V drives)
•
Cable lengths in excess of the specified values may be used only
when special techniques are adopted; refer to the supplier of the
drive.
•
The default switching frequency is 3kHz.
Pr
0.46
Motor rated current
must be set correctly to avoid a
risk of fire in the event of motor overload.
200V Nominal AC supply voltage
Model
Maximum permissible motor cable length for each of
the following frequencies
3kHz
4kHz
6kHz
8kHz
12kHz
16kHz
BA1201
65m (210ft)
50m
(165ft)
37m
(120ft)
BA1202
100m (330ft)
75m
(245ft)
BA1203
130m (425ft)
100m
(330ft)
BA1204
200m
(660ft)
150m
(490ft)
BA2201
BA2202
BA2203
BA3201
BA3202
BA4201
250m
(820ft)
185m
(607ft)
125m
(410ft)
90m
(295ft)
BA4202
BA4203
BA5201
250m
(820ft)
185m
(607ft)
125m
(410ft)
90m
(295ft)
BA5202
WARNING
400V Nominal AC supply voltage
Model
Maximum permissible motor cable length for each of
the following frequencies
3kHz
4kHz
6kHz
8kHz
12kHz
16kHz
BA1401
65m (210ft)
50m
(165ft)
37m
(120ft)
BA1402
100m (330ft)
75m
(245ft)
BA1403
130m (425ft)
100m
(330ft)
BA1404
200m
(660ft)
150m
(490ft)
BA1405
BA1406
BA2401
BA2402
BA2403
BA3401
BA3402
BA3403
BA4401
250m
(820ft)
185m
(607ft)
125m
(410ft)
90m
(295ft)
BA4402
BA4403
BA5401
BA5402
BA6401
BA6402
575V Nominal AC supply voltage
Model
Maximum permissible motor cable length for each of
the following frequencies
3kHz
4kHz
6kHz
8kHz
12kHz
16kHz
BA3501
200m
(660ft)
150m
(490ft)
100m
(330ft)
75m
(245ft)
BA3502
BA3503
BA3504
BA3505
BA3506
BA3507
690V Nominal AC supply voltage
Model
Maximum permissible motor cable length for each of
the following frequencies
3kHz
4kHz
6kHz
8kHz
12kHz
16kHz
BA4601
250m
(820ft)
185m
(607ft)
125m
(410ft)
90m
(295ft)
BA4602
BA4603
BA4604
BA4605
BA4606
BA5601
BA5602
BA6601
BA6602
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