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• In the following cases, direct temperature monitoring using PTC thermistor or resistance
thermometer is required:
– Duty types other than S1
– Forced ventilation (external fan, water cooling), unless the cooling is ensured by special
– Pole-changing rotating electrical machines
The certified tripping device required for this purpose must guarantee that the temperature
class specified on the device and/or the maximum surface temperature is not exceeded.
• It is only permissible that the motor is controlled from a voltage source DC link converter with
pulse width modulation, complying with the characteristic variables stamped on the motor.
• Anti-condensation heating elements can be mounted on the winding overhangs to protect
the winding. It is only permissible that these are operated when the motor is switched off.
Warning notes for safe operation are included in the operating instructions
2.15
Certificate with special conditions
The certificate with special conditions is provided under the Quality documents press
(Page 159). To do this, under field "Enter search term", enter the certificate number and select
the appropriate document from the documents that are listed.
The machine has an "X" marking (for EACEx in the Ex marking, for ATEX, IECEx and UKCA, in
the certificate number). To ensure safe operation in potentially explosive zones, the special
conditions of the certificate specified on the nameplate must be strictly complied with:
CNEX 17 ATEX 0004 X, IECEx CNEX 17.0004X, 2020312301002069...071,
2020312301002079...081, RU C-DE.AA81.B.00156-19, EPS 21 UKEX 1 249 X,
P508995/1 ... /14:
• The ambient temperature range is limited to -40 °C ... +60 °C for shaft heights 71 to 355. For
ambient temperatures above +40 °C up to +60 °C, a reduction of the output power (derating)
can be applied (between -4 % and -18 %) to avoid the thermal temperature limit being
exceeded. The derating must ensure that the maximum permissible internal and external
temperatures are not exceeded.
At absolute temperatures of more than +70 °C at the supply point or +80 °C at the branching
point of the conductors, a note must be attached to the motor stating that heat-resistant
cables must be used.
• Efficiency class IE3 is only guaranteed for motor types 1MB**53*** and 1MB**57*** (with
reduced starting current 700 %). Efficiency class IE3 is not guaranteed in all cases for motor
1MB**56*** (with reduced starting current 600 %). It is only permissible to use motor type
1MB**56***, when it is in full compliance with the local regulations of the country of use.
• When repairing flameproof gaps, the design data specified by the manufacturer must be
carefully complied with. A repair, where the values listed in Tables 1 and 2 of EN 60079-1 are
used, is not permissible.
• Temperature monitoring of the motor winding and the bearings with Pt100 elements in Ex
ib circuits is only permissible for FS315 and FS355 that are implemented in Ex db ib IIA/IIB/IIC
T4 -T6 Gb. These Ex ib circuits must be connected in auxiliary terminal boxes (Ex db) to
external, intrinsically safe ('ib') circuits in which suitable certified Ex ib devices are used.
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A
measures (monitoring, instruction in the certificate/operating instructions/rating plate).
Safety information
2.15 Certificate with special conditions
23
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