Table of Contents
Advertisement
Kollmorgen
6.5
Grounding system
AGND — ground for analog inputs/outputs, internal analog/µC ground
DGND — ground for digital inputs/outputs, optically isolated
XGND — ground for external 24V aux. voltage, optically and inductively isolated
PGND — ground for encoder simulation, RS232, CAN, optically isolated
The potential isolation is shown in the block diagram (ð p. 45).
6.6
Electrical Brake circuit
During electrical braking with the aid of the motor, energy is fed back to the servo amplifier. This
energy is converted into heat in the brake resistor. The brake 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 brake power which is required. A
simple method
description of the interface can be found on page 50.
Internal brake resistor
External brake resistor
Functional description
1.- Individual amplifiers, not coupled through the DC bus link (DC+, DC-)
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 brake power, then the servo amplifier will output the status "brake power
exceeded" and the brake 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.88).
The BTB/RTO contact (terminal X3/2,3) will be opened at the same time (ð p.68)
2.- Several servo amplifiers coupled through the DC bus link circuit (DC+, DC-)
Thanks to the built-in brake circuit, 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 brake
thresholds (which vary, because of tolerances). The brake 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.68).
Technical Data
The technical data depend on the used servo amplifier type and on the mains voltage. See table on
the next page.
®
SERVOSTAR
601...620 Instructions Manual
is described in the "Product Wiki" which is accessible at www.wiki-kollmorgen.eu. A
SERVOSTAR 601/603
SERVOSTAR 606-620
SERVOSTAR 601-620
07/2010
66 W
33 W
33 W
Technical description
27
Advertisement
Table of Contents
