Table 39: The recommended brake resistor types and the calculated resistance of the drive,
525-690 V
Enclosure size Drive type Duty cycle Type of brake
resistor
Resistance [Ω]
MR8
0080
Light duty BRR 0052 LD 6 18
Heavy duty BRR 0052 HD 6 18
0100-0125
Light duty BRR 0100 LD 6 9
Heavy duty BRR 0100 HD 6 9
MR9
0144
Light duty BRR 0100 LD 6 9
Heavy duty BRR 0100 HD 6 9
0170-0208
Light duty BRR 0208 LD 6 7
Heavy duty BRR 0208 HD 6 7
MR10 0261-0416
Light duty BRR 0416 LD 6 2.5
Heavy duty BRR 0416 HD 6 2.5
MR12 0460-0820
Light duty BRR 0416 LD 6 2 x 2.5
Heavy duty BRR 0416 HD 6 2 x 2.5
The enclosure size MR12 includes 2 power units, each of which has a brake chopper. The
brake choppers must have their own brake resistors. See the main circuit diagram in 5.1.3
General information about the installation, MR12.
•
The light duty cycle is for brake resistor cyclic use (1 LD pulse in a 120-second period).
The light duty resistor is rated for a 5-second ramp from full power to 0.
•
The heavy duty cycle is for brake resistor cyclic use (1 HD pulse in a 120-second period).
The heavy duty resistor is rated for a 3-second full power braking with a 7-second ramp
to 0.
Fig. 35: The LD and HD pulses
A. Light duty
B. Heavy duty
VACON · 108 TECHNICAL DATA, VACON® 100 INDUSTRIAL
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