I.10
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. 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
operator software
Our applications department can help you with the calculation of the regen power which is
required. A description of the interface can be found in Chapter III.3 .
Internal regen resistor
:
SERVOSTAR™ 601/603
66 Ohm
SERVOSTAR™ 606-620
33 Ohm
External regen resistor
:
SERVOSTAR™ 601-620
33 Ohm
Functional description
:
1.- Individual amplifiers, not coupled through the DC-link (DC+, DC-)
The circuit starts to respond at a DC-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-link voltage (after a few ms) an overvoltage will be detected and
the servo amplifier will be switched off with the error message “Overvoltage” (
ð
The BTB/RTO contact (terminal X3/2,3) will be opened at the same time (
2.- Several servo amplifiers coupled through the DC-link circuit (DC+, DC-)
Thanks to the built-in regen circuit with its patented w-characteristic, several amplifiers
(even with different current ratings) can be operated off a common DC-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
Regen circuit: technical data
SERVOSTAR™
Supply voltage
Rated data
DIM 601 - 603 606 - 620
3 x 230 V
Upper switch-on level of regen circuit
V
400 - 430
Switch-off level of regen circuit
V
380 - 410
Continuous power of regen circuit (R
Bint
)
W
80
200
Continuous power of regen circuit (R
Bext
) max.
kW
0,25
0,75
Pulse power, internal (R
Bint
max. 1s)
kW
2,5
5
Pulse power, external (R
Bext
max. 1s)
kW
5
3 x 400 V
Upper switch-on level of regen circuit
V
720 - 750
Switch-off level of regen circuit
V
680 - 710
Continuous power of regen circuit (R
Bint
)
W
80
200
Continuous power of regen circuit (R
Bext
) max.
kW
0,4
1,2
Pulse power, internal (R
Bint
max. 1s)
kW
8
16
Pulse power, external (R
Bext
max. 1s)
kW
16
3 x 480 V
Upper switch-on level of regen circuit
V
840 - 870
Switch-off level of regen circuit
V
800 - 830
Continuous power of regen circuit (R
Bint
)
W
80
200
Continuous power of regen circuit (R
Bext
) max.
kW
0,5
1,5
Pulse power, internal (R
Bint
max. 1s)
kW
10,5
21
Pulse power, external (R
Bext
max. 1s)
kW
21
18
SERVOSTAR™ 600 Installation-manual
General
02.99
Kollmorgen