PACMotion™ PSD
Installation and User Manual
Section 4
GFK-3168A
September 2020
Technical Description and Data
43
Legend:
FAULT: relay output, 1=ready to operate
STO-ENABLE 1: digital input, 1st switch-off path STO-ENABLE 2: digital input, 2nd switch-off path
STO-STATUS 1: digital output, switching state of 1st pulse inhibitor STO-STATUS 2: digital output,
switching state of 2nd pulse inhibitor T
1 …
T5: Test sequence
Start: Start of test sequence End: End of test sequence
4.17
Shock-hazard Protection
4.17.1
Leakage current
Leakage current via the PE conductor results from the combination of equipment and cable leakage
currents. The leakage current frequency pattern includes a number of frequencies, whereby the
residual-current circuit breakers definitively evaluate the 50 Hz current. For this reason, the leakage
current cannot be measured using a conventional multimeter. As a rule of thumb, the following
assumption can be made for leakage current on our low capacitance cables at a mains voltage of
400 V, depending on the clock frequency of the output stage: I
leak
= n x 20 mA + L x 1 mA/m at 8
kHz clock frequency at the output stage
I
leak
= n x 20 mA + L x 2 mA/m at a 16 kHz clock frequency at the output stage
(where Ileak=leakage current, n=number of drives, L=length of motor cable)
At other mains voltage ratings, the leakage current varies in proportion to the voltage.
Example: 2 x a 25m motor cable at a clock frequency of 8 kHz: 2 x 20 mA + 25 m x 1 mA/m
= 65 mA leakage current.
Note: Since the leakage current to PE is more than 3.5 mA, in compliance with IEC61800-5-1 the PE
connection must either be doubled or a connecting cable with a cross-section >10 mm² must be
used. Use the PE terminal and the PE connection screws in order to fulfill this requirement.
•
The following measures can be used to minimize leakage currents: Reduce the length of
the engine cable.
•
Use low capacitance cables (
