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Table 6-6
Maximum voltage peaks at the motor terminals for motors specifically designed for converter operation
Rated motor voltage
V
≤ 500 V
> 500 V to 690 V
Depending on the step height, the voltage rise times for the individual voltage steps in the
line-to-ground voltage at the motor end of the cable must not fall below the following values.
Table 6-7
Rise times as a function of voltage level
Step height
Machine overheating
Operating explosion-proof machines at the converter without using the appropriate protective
equipment can result in death or severe injury.
Always use PTC thermistor monitoring when operating explosion-protected machines at the
converter. Trip units according to Directive 2014/34/EU ("Explosion Protection Directive") or
according to country regulations are always necessary when using PTC thermistor monitoring.
Machines with types of protection flameproof enclosure "db", dust explosion protection
"tb" or dust explosion protection "tc"
For converter operation, these machines must be equipped with 3 PTC thermistors in
accordance with DIN VDE V 0898-1-401 with a rated response temperature that depends
on the maximum possible surface temperature. Select the PTC thermistor trip units in
accordance with this standard. If the temperature of the cable bushings is not stated on
the rating plate, it is max. 70 °C. Use suitable cables for this temperature. Do not exceed
the maximum frequency dependent on the number of poles, which is stamped on the rating
plate.
System, converter - cable - electrical machine
Please observe the information in accordance with EN / IEC 60034-17 and EN / IEC 60034-25
regarding winding stress. For public grids with operating voltages up to 690 V, the maximum
value of the voltage peaks at the end of the cable must not exceed twice the value of the
converter's DC link voltage.
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A
Û
phase-to-phase
V
pk
1600
2200
V
900
1050
1260
WARNING
Maximum peak voltage at the motor terminals
Û
phase-to-ground
V
pk
1400
1500
Electrical connection
6.6 Connecting converters
DC link U
1080
Minimum rise time t
r
ns
100
200
400
DC
V
750
91
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