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7.3 - Initial inspection by qualified personnel
Before commissioning, the equipment must be subjected to the initial detailed inspection to ensure that the
chosen protection and installation methods are suitable.
In this regard, see the standard IEC / EN 60079-17 "Explosive atmospheres - Part 17: verification and
maintenance of electrical installations", in particular Annex B "knowledge, skills and competences of the
responsible personnel, technical personnel with executive functions and operating staff".
Before wiring-up the gearmotor make sure that motor voltage corresponds to input voltage. If direction of
rotation is not as desired, invert two phases at the terminals of three phase asynchronous motor.
Y-_ starting should be adopted for no-load starting (or with a very small load) and for controlled starts, low
starting current and limited stresses, if requested.
If overloads are imposed for long periods or if shocks or danger of jamming are envisaged, then motor-
protection, electronic torque limiters, fluid couplings, safety couplings, control units or other similar devices
should be fitted.
Usually protect the motor with a thermal cut-out however, where duty cycles involve a high number of on-
load starts, it is necessary to use thermal probes for motor protection (fitted on the wiring); magnetothermic
breaker is unsuitable since its threshold must be set higher than the motor nominal current of rating.
Connect thermal probes, if any, to auxiliary safety circuits.
Use varistors and/or RC filters to limit voltage peaks due to contactors. Fuses do not prevent from voltage
peaks.
With non-electric motors (i.e. hydraulic motors) install torque limiters (i.e. max pressure valves) and do not
exceed n1 = 1 500 min-1.
Verify that the above mentioned accessories comply with application zone.
When gear reducer is equipped with a backstop device - whose presence is given by an arrow near the
low speed shaft stating the free rotation direction - provide a protection system where a backstop device
breaking could cause personal injury or property damage.
In polluting surroundings,
take suitable precautions against lubricant contamination through seal
rings or other.
If the reducer or gearmotor is repainted, use conductive paint
with surface resistivity values < 10
8
Ω
.
Gear reducers and gearmotors should be protected by appropriate means from solar radiance and
extremes of weather.
If it is necessary to run the gear reducer or gearmotor with ‘free’ shafts, securely fasten the key in the
keyway.
For ambient temperature greater than +40 °C or less than 0 °C, consult Rossi.
