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Motor Voltage and Frequency Supply

MGM motors are provided with a standard voltage rating of 230/400V±10% 50 Hz (IEC 38, CENELEC HD 472, CEI 8-6) "European voltage". On request they can be provided with different operating voltages.

The operating voltages at 50Hz and 60Hz are clearly indicated on the motor nameplate (see motor nameplate section). MGM motors are suitable to work within a voltage variation of 10% on the nameplate voltage. The available rated voltages are shown in the table below under "Nameplate voltage" at 50 Hz and 60 Hz, while the corresponding voltages on which the motor is able to run are shown under "Usable voltage".

Nameplate voltage

Usable voltage


230 / 400 50	277 / 480 60	240 / 415 50	220 / 380 50	265 / 460 60
190 / 330 50	220 / 380 60	208 / 360 60	230 / 400 60
208 / 360 50	254 / 440 60	200 / 346 50	240 / 415 60
400 / 690 50	480 / 830 60	380 / 660 50	415 / 717 50
	230 / 460 60	200 / 400 50
330 / 575 60

It is important to understand the torque vs. RPM curves for different voltages supplied to the motor (on the side) particularly for those motors running under heavy duty. If you are supplying the brake with a lower voltage than the nominal one, the air gap has to be adjusted more frequently than in the case of nominal voltage supply in order to guarantee a constant high brake performance.

Torque %

440 V 400 V

120

110 -f 100 "i

80 g 70 -I 60

50 -g 40 g 30

10 g

111111

5060

RPM %

Operating at 60Hz )

MGM motors with rated voltage of 230/400V 50Hz maintain the same rated and starting torque if operating at 277/480V 60 Hz while the RPM increase by about 20% (see torque vs. RPM comparing curves 1 and 2 here below).

The AC brake coil on BA series works equally well if operating either at 230/400V 50Hz or at 277/480V 60Hz. The DC brake coil with nameplate voltage of 110V, 230V or 400V on BM and BA series has to be supplied at 110V, 230V or 400V single phase respectively both at 50 Hz or 60 Hz (i.e. a 230V brake can be supplied single-phase at 230V 50Hz or at 230V 60 Hz).

MGM is able to provide motors and brake coil suitable for operating on 220/380V 60Hz power supply. It is not advisable to run motors designed for 230/400V 50Hz and 277/480V 60Hz on 220/380V 60Hz voltage supply as the power remains the same, but the starling torque is reduced by 35% (see curves 1 and 3 here below).

MGM strongly recommends not to use a 277/480V 60Hz (230/400V 50Hz) AC brake coil on 220/380V 60Hz power system as it results in a significant loss of performance.

DC industrial brakes with a rated voltage of 230V 50Hz can be used on 220V 60Hz and those with a rated voltage of 400V 50Hz on 380V 60Hz power system.

The diagram below shows different curves (torque vs. RPM) for a 230/400V 50Hz (277/480 60Hz) rated voltage motor running on different power systems.

Torque % 100%

65%

(I 230/400V 50Hz (277/480V 60Hz) rated voltage motor running on 230/400V 50 Hz power system.

(2 230/400V 50Hz (277/480V 60Hz) rated voltage motor running on 277/480V 60 Hz power system.

(3 230/400V 50Hz (277/480V 60Hz) rated voltage motor running on 220/380V 60Hz power system.

120% RPM %

100%

It is important to point out that, if running the motor at 60Hz instead of 50 Hz, the maximum number of starts reduces by about 15-20%, and the noise level increases by about 3dB due to the increased speed of the cooling fan.