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Technical Description
2.13
Regen circuit
During braking with the aid of the motor, energy is fed back to the servo amplifier. This energy is
converted into heat in the regen resistor (ð p. 90). The regen resistor is switched into circuit by the
regen circuit. The regen circuit (thresholds) are adjusted to the supply voltage with the help of the
setup software.
Our customer service can help you with the calculation of the regen power which is required. A des-
cription of the interface can be found on page 45.
Functional description:
1.- Individual amplifiers, not coupled through the DC bus link (DC+, DC-)
2.- Several servo amplifiers coupled through the DC bus link circuit (DC+, DC-)
Regen circuit: technical data
Supply voltage Rated data
22
The circuit starts to respond at a DC bus link voltage of 400V, 720V or 840V (depending on the
supply voltage). If the energy which is fed back from the motor, as an average over time or
as a peak value, is higher than the preset regen power, then the servo amplifier will output
the status "regen power exceeded" and the regen circuit will be switched off. At the next
internal check of the DC bus link voltage (after a few ms) an overvoltage will be detected and
the servo amplifier will be switched off with the error message "Overvoltage F02" (ð p. 70).
The BTB/RTO contact (terminal X3/2,3) will be opened at the same time (ð p. 55).
Thanks to the built-in regen circuit with its patented power distribution, several amplifiers
(even with different current ratings) can be operated off a common DC bus link. This is achieved
by an automatic adjustment of the regen thresholds (which vary, because of tolerances).
The regen energy is distributed equally among all the amplifiers. The combined power of
all the amplifiers is always available, as continuous or peak power. The switch-off takes
place as described under 1. (above) for the servo amplifier with the lowest switch-off
threshold (resulting from tolerances).
The RTO (BTB) contact of this amplifier (terminals X3/2,3) will be opened at the same time
(ð p. 55).
External regen resistor
Upper switch-on level of regen circuit
Switch-off level of regen circuit
3 x 230 V
Overvoltage F02
Continuous power of regen circuit (R
Pulse power, external (R
External regen resistor
Upper switch-on level of regen circuit
Switch-off level of regen circuit
3 x 400 V
Overvoltage F02
Continuous power of regen circuit (R
Pulse power, external (R
External regen resistor
Upper switch-on level of regen circuit
Switch-off level of regen circuit
3 x 480 V
Overvoltage F02
Continuous power of regen circuit (R
Pulse power, external (R
02/06
) max.
Bext
max. 1s)
Bext
) max.
Bext
max. 1s)
Bext
) max.
Bext
max. 1s)
Bext
AX2040/2070 Installation Manual
Beckhoff
AX
DIM
2040
2070
Ohm
15
V
400 - 430
V
380 - 410
V
450
kW
6
kW
10
Ohm
15
V
720 - 750
V
680 - 710
V
800
kW
6
kW
35
Ohm
15
V
840 - 870
V
800 - 830
V
900
kW
6
kW
45
10
16
10
50
10
70
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