I.7 Interference suppression
If interference occurs in the CNC, or the analog or digital path measurement systems, then there
are some additional measures, listed below:
n
additional ferrite rings on the motor leads
n
wiring in armature chokes (please use the types supplied by us)
n
HF filter on the CNC setpoint output (RC combination 1kW/10nF)
In each case you will have to try out which measures bring sufficient reduction in interference.
I.8 Ballast circuit
When the motor is braked, energy is fed back to the transistor controller. This energy is
converted into heat in the ballast resistor. The ballast resistor is switched into circuit by the
ballast circuit.
The ballast circuit starts to respond at a DC-link voltage of 85V.
Repetitive loading causes the switch-on threshold of the ballast circuit to rise to 90V, thanks to
the built-in -w- characteristic, so that power sharing is achieved if several modules are
connected in parallel on the same DC-link bus.
You should make a rough calculation of the ballast power dissipation which is to be
expected, from the known drive data – especially for single axes.
The following method has proved itself for normal servo applications:
peak ballast power peak power of all amplifier0.33>× s
å
continuous power 0.03 continuous power ofballast >× all motors
å
Our in-house application department can provide further assistance in calculating the required
ballast power capacity for your system.
Chapter I General Page I - 7
Kollmorgen 12.99 Series 04S
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