Resistor braking
91
Resistor braking
What this chapter contains
This chapter describes how to select, protect and wire braking choppers and
resistors. The chapter also contains the technical data.
Braking choppers and resistors with the ACSM1-04
Braking choppers
ACSM1-04 drives have a built-in braking chopper as standard equipment to handle
the energy generated by a decelerating motor.
When the braking chopper is enabled and a resistor connected, the chopper will start
conducting when the DC link voltage of the drive reaches 780 V. The maximum
braking power is achieved at 840 V.
Braking resistor selection
To select a braking resistor:
1. Calculate the maximum power generated by the motor during braking.
2. Calculate the continuous power based on the braking duty cycle.
3. Calculate the braking energy during the duty cycle.
Pre-selected resistors are available from ABB as shown in the table below. If the
listed resistor is not sufficient for the application, a custom resistor can be selected
within the limits imposed by the internal braking chopper of the ACSM1-04. The
following rules apply:
• The resistance of the custom resistor must be at least
R
min
. The braking power
capacity with different resistance values can be calculated from the following
formula
where UDC equals 840 V.
WARNING!
Never use a braking resistor with a resistance below the value specified
for the particular drive type. The drive and the chopper are not able to handle the
overcurrent caused by the low resistance.
• The maximum braking power must not exceed
P
brmax
at any point
• The average braking power must not exceed
P
brcont
P
max
<
U
DC
R
2
Содержание ACSM1 Series
Страница 1: ...ACSM1 Hardware Manual ACSM1 04 Drive Modules 0 75 to 45 kW...
Страница 2: ......
Страница 4: ......
Страница 14: ...Table of contents 14...
Страница 20: ...About this manual 20...
Страница 24: ...The ACSM1 04 24...
Страница 30: ...Planning the cabinet assembly 30...
Страница 46: ...Planning the electrical installation 46...
Страница 70: ...Maintenance 70...
Страница 84: ...Technical data 84...
Страница 90: ...Mains filters 90...
Страница 96: ...Dimension drawings 96 Frame size A...
Страница 97: ...Dimension drawings 97...
Страница 98: ...Dimension drawings 98 Frame size B...
Страница 99: ...Dimension drawings 99...
Страница 100: ...Dimension drawings 100 Frame size C air cooled module...
Страница 101: ...Dimension drawings 101...
Страница 102: ...Dimension drawings 102 Frame size C for cold plate mounting...
Страница 103: ...Dimension drawings 103 Frame size D air cooled module...
Страница 104: ...Dimension drawings 104 Frame size D for cold plate mounting...
Страница 106: ...Dimension drawings 106 Mains filters type JFI xx...
Страница 108: ...Dimension drawings 108 Braking resistors type JBR xx...
Страница 110: ...Dimension drawings 110...
Страница 111: ......