115
APPENDIX A
A.1 BRAKING RESISTORS AND UNITS
A.1.1 Selection of Resistance of Braking Resistor
A.1.2 Selection of Power of Braking Resistor
The AC drive transfers regenerative
energy generated during braking of motor
to an external braking resistor, according
to formula R = Vdc x Vdc / Pb.
• Vdc refers to braking voltage at system stable
braking. (Its value varies with the system.
The default braking voltage of the Benshaw
PowerPro
™
High Performance Single AC Drive
is 760 V. You can set F9-08 to change the value.)
• Pb refers to braking power
In theory, power of braking resistor is the same
as braking power. But in consideration of
de-rating, power of braking resistor is calculated
from the following formula: Pr = Pb x D / K
• K is about 50%.
• Pr refers to power of braking resistor.
• D refers to braking frequency
(Duty Cycle).
CAUTION
K is de-rating coefficient of braking resistor.
Low K value can ensure that braking resistor
does not get over-heated. The K value can be
increased appropriately on the condition of
good dissipation and should not exceed
50%. Failure to comply may result in a fire
due to overheating of braking resistor.
Braking frequency (D) is determined by
application. Typical values of braking frequency
in different applications are listed in Table A-1-2.
Application
Elevator
Winding &
Unwinding
Centrifuge
Occasional
Braking Load
General
Application
Braking Frequency (Duty Cycle)
20% to 30%
20% to 30%
50% to 60%
5%
10%
Table A-1-2 Typical values of braking frequency in different applications
A.1.3 Selection Guidance for Braking Units
Table A-2 Selection Guidance for Braking Units
Model Number
Applicable
Motor (HP)
Braking Unit
125% Braking Torque
(10% D, Max. 10s)
Remark
Min. Resistance
of Braking
Resistor (Ω)
Model
Qty.
Specification Qty.
RSI-PPVC-00H5-4-3-B-IP20-IM
0.5
Built-in
—
80W 1450Ω
1
AC drive model
ending with
letter “B”
96
RSI-PPVC-0001-4-3-B-IP20-IM
1
140W 800Ω
1
96
RSI-PPVC-01H5-4-3-B-IP20-IM
1.5
220W 500Ω
1
96
RSI-PPVC-0002-4-3-B-IP20-IM
2
300W 380Ω
1
64
RSI-PPVC-0003-4-3-B-IP20-IM
3
440W 260Ω
1
64
RSI-PPVC-0004-4-3-B-IP20-IM
4
600W 190Ω
1
32
RSI-PPVC-0005-4-3-B-IP20-IM
5
740W 150Ω
1
32
RSI-PPVC-07H5-4-3-B-IP20-IM
7.5
1100W 100Ω
1
32
RSI-PPVC-0010-4-3-B-IP20-IM
10
1500W 75Ω
1
32
RSI-PPVC-0015-4-3-B-IP20-IM
15
2200W 50Ω
1
20
RSI-PPVC-0020-4-3-B-IP20-IM
20
3000W 38Ω
1
20
RSI-PPVC-0025-4-3-B-IP20-IM
25
Built-in
—
4000W 32Ω
1
24
RSI-PPVC-0030-4-3-B-IP20-IM
30
4500W 27Ω
1
24
RSI-PPVC-0040-4-3-B-IP20-IM
40
6000W 20Ω
1
19.2
RSI-PPVC-0050-4-3-B-IP20-IM
50
7000W 16Ω
1
14.8
RSI-PPVC-0060-4-3-B-XN01-IM
60
9000W 13Ω
1
12.8
RSI-PPVC-0075-4-3-B-XN01-IM
75
11000W 10.5Ω
1
9.6
RSI-PPVC-0100-4-3-B-XN01-IM
100
15000W 7.7Ω
1
6.8
OPTIONS AND ACCESSORIES
