344 Resistor braking
Selecting a brake resistor
To select a brake resistor, calculate the following:
• maximum power generated by the motor during braking
• continuous power based on the braking duty cycle
• braking energy during the duty cycle.
Pre-selected resistors are available from ABB as shown in the
below. If the listed resistor is not sufficient for the application, a custom
resistor can be selected within the limits imposed by the internal brake chopper of the
ACL30 drive, based on the following rules.
Brake resistor selection table
The ratings apply at an ambient temperature of 40 °C (104 °F).
Apply the following rules:
Check the resistance of the custom resistor is at least
R
min
.
You can calculate the braking power capacity with different resistance values using the
following formula:
where,
U
DC
= 840 V.
WARNING!
Never use a brake resistor with a resistance below the value
specified for the particular drive type. The drive and the chopper cannot
handle the overcurrent caused by the low resistance.
Make sure the maximum braking power does not exceed
P
brmax
at any point.
Limit the average braking power within
P
brcont
.
Do not exceed the braking energy dissipation capacity of the selected resistor.
Protect the resistor from thermal overload. See
page
.
Drive type
ACL30-04...
Frame size
R
min
(ohm)
Type
-06A0
B
120
JBR-01
-09A0
B
80
JBR-03
-013A
B
40
JBR-04
-017A
-023A
C
20
JBR-05
-030A
-050A
D
13
JBR-06
-070A
R
min
– The minimum allowed resistance of the braking resistor.
P
max
U
DC
2
R
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Summary of Contents for ACL30
Page 1: ...ABB high performance elevator drives User s manual ACL30 elevator drive ...
Page 4: ......
Page 20: ...20 Safety instructions ...
Page 34: ...34 Operation principle and hardware description ...
Page 42: ...42 Planning the cabinet installation ...
Page 60: ...60 Planning the electrical installation ...
Page 126: ...126 Using the control panel ...
Page 318: ...318 Maintenance ...
Page 334: ...334 The Safe torque off function ...
Page 338: ...338 Mains chokes ...
Page 342: ...342 EMC filters ...
Page 348: ...Dimension drawings 348 Frame size B D1 D2 W H1 H2 ...
Page 349: ...Dimension drawings 349 ...
Page 350: ...Dimension drawings 350 Frame size C D1 D2 H2 H1 W ...
Page 351: ...Dimension drawings 351 ...
Page 352: ...Dimension drawings 352 Frame size D ...
Page 354: ...354 Dimension drawings EMC filters JFI 0x ...
Page 356: ...356 Dimension drawings Brake resistors JBR xx ...
Page 358: ...358 Dimension drawings ...