Lenze 8250 series Brake unit - Manual (Page 18)

Technical Data
8250BA0903 3-3
3.3 Rated data
3.3.1 Brake units
Type EMB8251-E EMB8252-E EMB8253-E
Order
no.
EMB8251-E EMB8252-E EMB8253-E
Supply voltage V
N
270 ¼ 400 V DC 270 ¼ 750 V DC 270 ¼ 750 V DC
Threshold V
Z
375 V DC 725 V DC 725 V DC
Peak current 5.4 A DC 2.7 A DC 15 A DC
Max. continuous current 0.2 A DC 0.1 A DC 7.5 A DC
Peak braking power at V
Z
2 kW 1) 2 kW 1) 11.2 kW 2)
Continuous braking power at V
Z
70 W 70 W 5.6 kW
Min. brake resistance (internal resistor) (internal resistor) 47 Ω ± 10%
Max. energy (min. 5 min break) 20 kWs 20 kWs (external resistor)
Power derating 40 °C < T < 50 °C: 2%/K
1000 m a.m.s.l. < h < 4000 m a.m.s.l.: 5%/1000 m
Weight 1.3 kg 1.3 kg 1.1 kg
1) max. 10 s with switch-on cycle 3 %
2) max. 60 s with switch-on cycle 50 %
3.3.2 Assignment table for brake resistors
The assignment depends on the motor power and is effective up
to the indicated limit value.
Motor power Recommended Lenze brake resistor oto po e
Order no. Resistor Peak braking power Thermal capacity
kW Ω kW kWs
< 0.75 ERBM470R100W 470 1.0 15
< 1.5 ERBM370R150W 370 1.5 22,5
< 2.2 ERBM240R200W 240 2.0 30
< 3.0 ERBD180R300W 180 3.0 45
< 4.0 ERBD100R600W 100 5.5 90
< 5.5 ERBD082R600W 82 6.5 90
< 7.5 ERBD068R800W 68 8.0 120
< 11.0 ERBD047R01K2 47 11.5 180
The resistors are designed for a cycle of:
• max. 15 s braking at peak braking power
• min. 150 s release time after braking
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