Protection Against Contact; Leakage Current - Pilz PMCtendo DD5 Operating Manual

Wiring
Please note the following safety guidelines:
6.3.1

Protection against contact

6.3.1.1

Leakage current

The leakage current via the protective earth conductor PE is the sum of the leakage cur-
rents from the devices and cables.
The frequency of the leakage current is made up of a number of frequencies. The residual
current devices evaluate the 50 Hz current. It's not possible to measure the leakage cur-
rents using a conventional multimeter because these too are standardised at 50 Hz current.
The ready-made cables from Pilz are low capacity. The leakage current can be calculated
approximately as follows (at 400 V mains voltage):
}
I
abl
}
I
abl
I = leakage current, n = number of servo amplifiers, L = length of motor cable
abl
With other mains voltages, the leakage current will vary in proportion to the voltage.
Example: 2 x servo amplifiers + 25 m motor cable at 8 kHz clock frequency:
2 x 20 mA + 25 m x 1 mA/m = 65 mA leakage current.
Operating Manual PMCtendo DD5
1002236-EN-04
DANGER!
Risk of electrocution!
Never unplug the electrical connections on the servo amplifier while voltage
is applied.
Switch off the supply voltages!
Residual charges in the capacitors may still show hazardous values for up
to five minutes after the mains voltage is switched off.
Measure the voltage on the intermediate circuit (+DC/-DC). Wait until the
voltage has dropped below 40 VDC.
Wait at least five minutes before touching any parts that carry voltage (e.g.
contacts) or loosening the connections.
DANGER!
Risk of electrocution!
Never wire the electrical connections on the servo amplifier while voltage is
applied.
Switch off the mains voltages and 24 V supply!
Make sure that the control cabinet is made safe, e.g. through an access
lock or warning signs. Do not switch on the voltages until the system is com-
missioned!
= n x 20 mA + L x 1 mA/m at 8 kHz clock frequency at the output stage
= n x 20 mA + L x 2 mA/m at 16 kHz clock frequency at the output stage
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