Inovance MD280NT2.2GB - Page 28

MD280 User Manual Product Information
- 27 -
2.8.1 Calculating the Resistance
The motor and load’s regenerative energy is almost consumed on the braking resistor when
braking.
$FFRUGLQJWRWKHIRUPXOD8[85 3E

U refers to the braking voltage at system stable braking.

The value of U varies with different systems. For 380V AC systems, U is generally
assigned a value of 700V.

Pb refers to the braking power.
2.8.2 Calculating the Power of Braking Resistor
In theory, the power of the braking resistor is consistent with the braking power. Considering
de-rating use to 70%, you can calculate the power of the braking resistor according to the
IRUPXOD[3U 3E['

Pr refers to the power of resistor.

'UHIHUVWRWKHEUDNLQJIUHTXHQF\SHUFHQWDJHRIWKHUHJHQHUDWLYHSURFHVVWRWKHZKROH
ZRUNLQJSURFHVV
Application Elevator
Winding and
unwinding
Centrifuge
Occasional
braking load
General
Application
Braking
Frequency
20%–
30%
20%–30% 50%–60% 5% 10%
Table 2-7 Recommended values of braking resistor
AC Drive Model
Recommended
Power
Recommended
Resistance
Braking
Unit
Remarks
MD280NS0.4GB 80 W ȍ
Built-in
VWDQGDUG
-
MD280NS0.7GB 80 W ȍ
MD280NS1.5GB 100 W ȍ
MD280NS2.2GB 100 W ȍ
MD280NT0.7GB 150 W ȍ
MD280NT1.5GB 150 W ȍ
MD280NT2.2GB 250 W ȍ
MD280NT3.7GB/5.5PB 300 W ȍ
MD280NT5.5GB/7.5PB 400 W ȍ
MD280NT7.5GB/11PB 500 W ȍ
MD280NT11GB/15PB 800 W ȍ
MD280NT15GB/18.5PB 1000 W ȍ
MD280NT18.5G/22P 1300 W ȍ
Built-in
RSWLRQDO
"B" added to the
AC drive model
MD280NT22G/30P 1500 W ȍ
MD280NT30G/37P 2500 W ȍ
efesotomasyon.com