268
Brake chopper
Section 13-3
13-3 Brake chopper
All VSD sizes can be fitted with an optional built-in brake chopper. The brake
resistor must be mounted outside the VSD. The choice of the resistor
depends on the application switch-on duration and duty-cycle. This option can
not be after mounted.
!Warning
The table gives the minimum values of the brake resistors. Do not use
resistors lower than this value. The VSD can trip or even be damaged due to
high braking currents.
The following formula can be used to define the power of the connected brake
resistor:
Where:
P
resistor
required power of brake
resistor
Brake level V
DC
DC brake voltage level (see Table 35)
Rmin
minimum allowable brake resistor
(see Table 35 and Table 36)
ED%
effective braking period. Defined as:
Table 34 Brake Voltage levels
Supply voltage (V
AC
)
(set in menu [21B]
Brake level (V
DC
)
220–240
380
380–415
660
440–480
780
500–525
860
550–600
1000
660–690
1150
Table 35 Brake resistor SX 400V type
Type
Rmin [ohm] if supply 380–
415 V
AC
Rmin [ohm] if supply 440–
480 V
AC
SX-D40P7-EF
43
50
SX-D41P5-EF
43
50
SX-D42P2-EF
43
50
SX-D43P0-EF
43
50
SX-D44P0-EF
43
50
SX-D45P5-EF
43
50
SX-D47P5-EF
43
50
SX-D4011-EF
26
30
SX-D4015-EF
26
30
SX-D4018-EF
17
20
SX-D4022-EF
17
20
Presistor =
(Brake level VDC)2
Rmin
x ED%
ED% =
Active brake time at
120 [s]
Maximum value of
1= continuous braking
nominal braking
power [s]
Summary of Contents for SX-F
Page 2: ......
Page 14: ...6 Table of contents...
Page 20: ...12 Glossary Section 1 6...
Page 32: ...24 Cabinet mounting Section 2 3...
Page 58: ...50 Connecting options Section 5 6...
Page 72: ...64 Load Monitor and Process Protection 400 Section 7 5...
Page 74: ...66 EMC standards Section 8 1...
Page 266: ...258 System Data 900 Section 11 9...
Page 274: ...266 Maintenance Section 12 3...
Page 284: ...276 Liquid cooling Section 13 12...
