5.2.4 Protective Earthing conductor current
There are two 10nF Y-capacitors between DC-Bus and earth. These cause currents in the protective
earth connections if the DC-Bus contains common mode components of the line frequency. The same
applies due to the motor shielding capacitors discussed in chapter 5.2.3, when the motor PWM is on.
These currents may extend beyond the 3.5mAAC limit of the 61800-5-1:2008 standard. Therefore a sec-
ond earth connection is mandatory, see chapter 7.4.2.
5.3 Motor brake
A motor holding brake can be controlled directly by the drive. The digital output 1 or 2 switch is used
for the brake functionality. See brake wiring in chapter 7.10.3. Consult [2] for the software configuration
of the motor brake.
A safe break output is provided but not certified yet.
Symbol
Safety Information
CAUTION
This function does not ensure personnel safety! Hanging loads (vertical axes) require an addi-
tional mechanical brake which must be safely operated or series connection of the safety
switch in within the brake loop shown here.
DANGER
AVOID DANGER ON POSSIBLE FAILURE
Be aware that this is not a safety output. It is prohibited to use this output alone when failure
might cause a dangerous situation.
5.4 Dynamic braking
During braking with the aid of the motor, energy is fed back to the drive system and the voltage of the
DC-Bus may increase. Using the Triamec TP80 or TP130 supports this situation with the brake resistor in
the Power supply.
Using the Triamec TP80 or TP130 power supplies, several amplifiers of the same series can be operated
on a common DC bus link, without requiring any additional measures. Energy fed back by one drive is
stored in the power supply capacitors. If the voltage passes the brake limit of the power supply, the in-
ternal or external brake resistor dissipates energy. If the energy to be dissipated goes beyond the brake
resistor specification, this feature is turned off and the bridge voltage rises further. Then the maximum
bridge voltage of the drives will be reached and the drives generate the error "BridgeVoltageOut-
OfRange" and the output stage is switched off. Since the mechanics now runs without deceleration, the
bridge voltage will not rise any further.
For more information see the documentation of the TP80/TP130 Power Supplies [1].
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