Beckhoff AX2500 Series, Assembly, Installation, Setup

Page: 19 / 81

2.11 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 in and
out by the regen circuit. The switching thresholds for the regen circuit are adjusted to suit
the supply voltage with the aid of the setup software.
Our customer support can help you with the calculation of the regen power which is requi-
red. A description of the interface can be found on page 39 .
Internal regen resistor 33
W
External regen resistor (
ð
p.71) 33
W
Functional description
The regen circuit starts to respond when the DC Bus link voltage reaches the set value.
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 sta-
tus
regen power exceeded and the circuit will be switched off.
At the next internal check of the DC Bus link voltage (after a few milliseconds) an overvol-
tage will be detected and the servo amplifier will be switched off, with the error message
overvoltage (
ð
p.66).
The BTB/RTO contact (terminals X1/1,2) will be opened simultaneously (
ð
p.49).
Technical data
Supply voltage Rated data DIM Value
3 x 230 V
Upper switch-on threshold for regen circuit V 400
Switch-off threshold for regen circuit V 380
Continuous int. power in regen circuit (R
Bint
) W 55
Continuous ext. power in circuit (R
Bext
) max. kW 0,4
Pulse power, internal (R
Bint
max. 1s) kW 4.8
Pulse power, external (R
Bext
max. 1s) kW 4.8
External regen resistor
W
33
3 x 400 V
Upper switch-on threshold for regen circuit V 720
Switch-off threshold for regen circuit V 680
Continuous int. power in regen circuit (R
Bint
) W 80
Continuous ext. power in circuit (R
Bext
) max. kW 0,6
Pulse power, internal (R
Bint
max. 1s) kW 16
Pulse power, external (R
Bext
max. 1s) kW 16
External regen resistor
W
33
2.11.1
LED display
A 3-digit LED display indicates the amplifier status after switching on the 24V supply
(
ð
p.65).
2.12 Grounding system
AGND – ground reference for analog signals, internal analog ground
DGND – ground reference for digital signals and auxiliary supply voltage,
optically isolated
PGND — ground reference for position output
The electrical isolation is indicated in the block diagram (
ð
p.37).
AX2500 Installation Manual 19
Beckhoff
02/06
Technical description