Flottweg TRICANTER Z 8E, Руководство по эксплуатации

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10 | INDUCTION MOTORS FOR HAZARDOUS AREAS - English -
2.5 GROUNDING CONNECTION
Besides the grounding connection provided inside the terminal box, Ex motors are fitted with a second
“grounding connection”, attached to the frame.
This must be connected to the general “unit-ground” by means of a conductors section, related to the
line-conductor section as it is described on the table below:
line conductor Grounding conductor
S ≤ 16 mm² S (mm²)
16 < S ≤ 35 mm² 16 mm²
S > 35 mm² 0.5 S (mm²)
2.6 ADDITIONAL INSTALLATION INSTRUCTIONS
Explosion proof motors must be protected against overload by means of a device incorporated into the
motor (i.e, a thermistor inserted into the coil head) or, by independent devices.
On the installation, it is also important to check whether motor cooling is suitable or not.
For this purpose, the minimum distance between motor and any other structure, that can affect cooling,
is given on the table below:
Frame sizes Minimum Distance from outside structures (mm)
90 / 100 / 112 30
132 / 160 35
180 / 200 45
225 / 355 85
3 MoToRs FED bY VaRIablE FREQUEnCY DRIVEs
3.1 ELECTRICAL CHARACTERISTICS
3.1.1. TEMPERATURE CLASS
Motors fed by VFD are suitable to operate at T4 temperature class.
3.1.2 USE OF FILTERS
Motors with voltages up to 575V do not require filters if follow the criteria below:
Rated
Voltage
Insulation
system
Technical criteria for VFD application
Voltage
spikes motor
terminals
(maximum)
dV/dt
inverter
terminals
(maximum)
Rise time(*)
inverter
terminals
(minimum)
MTbP(*) Minimum
Time between Pulse
Vrated < 460V
Standard
Insulation
< 1600V < 5200 V/ µ s
> 0,1 µ s > 6 µ s
460V < Vrated
< 575V
Reinforced
Insulation
< 1800V < 6500 V/
µ
s
(*) Informed by the converter manufacturer.
Note: Nameplate showing voltage 380-415V / 660-690V – 50Hz and 440 - 480 – 60Hz, and fed by VFD on
voltage 660-690V – 50Hz or 480V – 60Hz require filters.
Motors fed by VFD with voltage range of 575V up to 690V require filters.