Siemens SIMOTICS XP 1MB1 series Operating Instructions Manual page 20

Safety information
2.12 Special conditions for explosion-proof machines
If the three-phase motor is cooled using a external fan, then it must be carefully ensured that
the motor can only be operated with the cooling switched on.
When commissioning, it must be carefully ensured that when fed from a converter, no
inadmissibly high overvoltages occur at the motor terminals. The clearances and creepage
distances in the terminal box do not permit overvoltages as a result of converter operation
with a periodic peak value of more than:
- 1500 V for rated voltages ≤ 500 V.
The motor insulation system may mean that it is necessary to further limit periodically
occurring overvoltages.
Zone 1 - PTB 03 ATEX 3107X, PTB 02 ATEX 3060X, PTB 01 ATEX 3335X, PTB 01 ATEX
3336X, PTB 01 ATEX 3337X, PTB 04 ATEX 3041X
Special conditions relating to the installation:
If the non-terminated cable ends are connected to the external power circuit according to EN
60079-0, Paragraph 14.1 in the hazardous zone, then a terminal box with its own certification
and explosion protection marking must be selected according to the conditions that prevail at
the installation site.
Zone 1 - PTB 02 ATEX 3024X
It is only permissible that these types of motors are operated in conjunction with gas return
pumps at converters of the type specified above with the defined setting values. Further,
they must be monitored using the adapted equipment described in the data sheet. The
maximum cable length between the converter and motor is 4 m.
Zone 1 - PTB 03 ATEX 3053X, PTB 03 ATEX 3054X
It is only permissible that the motors are operated with a converter and filter of the types
specified in the data sheet with the setting values defined there. The motors must also be
monitored corresponding to what is specified in the data sheet.
Zone 2, 22 - BVS 14 ATEX E 081 X, BVS 14 ATEX E 082 X
It is only permissible that the motor is fed from a voltage-source DC link converter with pulse
width modulation, maintaining the parameters listed in Section 15.3.
Before commissioning it must be carefully ensured that when fed from a converter, no
inadmissibly high overvoltages occur at the motor terminals. The clearances and creepage
distances in the terminal box do not permit overvoltages as a result of converter operation
with a periodic peak value of more than 1500 V for rated voltages ≤ 1000 V.
The motor insulation system may mean that it is necessary to further limit periodically
occurring overvoltages.
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1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A