7 General
Installation manual for PMC tendo DD5/PMCprimo Drive3 Page 25
7.9 Grounding system
AGND — analog inputs, internal analog ground, encoder emulation, RS232, CAN (X6)
DGND — digital inputs/outputs and the 24V supply, optically isolated
EGND — digital inputs/outputs (X10); 24V supply PMCprimo Drive3, supply master encoder,
optically isolated
7.10 Regen circuit
During braking with the aid of the motor, energy is fed back into the servo amplifier. This
regenerative energy (hence the term “regen” circuit) is dissipated as heat in the regen resistor.
The regen resistor is switched in by the regen circuit.
The setup software PDrive can be used to adapt the regen circuit (thresholds) according to the
electrical supply voltage.
Our customer service can help you with the calculation of the regen power that is necessary for
your system.
A description of the interface can be found on page 48.
7.10.1 Functional description
1. Individual amplifiers, not coupled through the DC bus link circuit (DC+, DC-)
If the energy fed back from the motor has an average or peak power that exceeds the preset
level for the regen power rating, then the servo amplifier generates the warning “n02 regen
power exceeded” and the regen circuit is switched off.
The next internal check of the DC bus link voltage (after a few milliseconds) detects an
overvoltage and the servo amplifier is switched off, with the error message “Overvoltage
F02” ( p. 98).
The BTB/RTO contact (terminals X3/2,3) will be opened at the same time (p. 62).
2. Several servo amplifiers coupled through the DC bus link (DC+, DC-)
Thanks to the built-in regen circuit, several amplifiers (even with different current ratings)
can be operated off a common DC bus link, without requiring any additional measures.
The combined (peak and continuos) power of all amplifiers is always available. The
switch-off on overvoltage takes place as described under 1. (above) for the amplifier that
has the lowest switch-off threshold (resulting from tolerances).
Technical data of the regen circuits dependent on the amplifiers type and the mains voltage
situation see table on the next page.
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