Cabling Requirements; Planning Cable Runs; Increasing Motor Cable Length; Emc Installation Options - Parker 650G Product Manual

Control and signal cables connections should be made with screeened cables, with the screen
connected only at the VSD end. However, if high frequency noise is still a problem, earth screen
at the non VSD end via a 0.1F capacitor.
Note: Connect the screen (at the VSD end) to the VSD protective earth point, and not to the
control board terminals.

Cabling Requirements

Note: Refer to Chapter 9: "Technical Specifications" for additional Cabling Requirements.

Planning Cable Runs

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Increasing Motor Cable Length

Because cable capacitance and hence conducted emissions increase with motor cable length,
conformance to EMC limits is only guaranteed with the specified ac supply filter option using a
maximum cable length as specified in Chapter 9 "Technical Specifications".
This maximum cable length can be improved using the specified external input or output filters.
Refer to Chapter 9: "Technical Specifications" - External AC Supply (RFI) Filters.
Screened/armoured cable has significant capacitance between the conductors and screen which
increases linearly with cable length (typically 200pF/m but varies with cable type and current
rating).
Long cable lengths may have the following undesirable effects:
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These effects can be overcome by adding chokes or output filters at the output of the VSD.

EMC Installation Options

The unit, when installed for category C1 & C2 operation will be compliant with EN61800-3 for
radiated emissions, as described below.
650G AC Drive
Use the shortest possible motor cable lengths.
Use a single length of cable to a star junction point to feed multiple motors.
Keep electrically noisy and sensitive cables apart.
Keep electrically noisy and sensitive parallel cable runs to a minimum. Separate parallel
cable runs by at least 0.25 metres. For runs longer than 10 metres, separation should be
increased proportionally. For example if the parallel runs were 50m, then the separation
would be (50/10) x 0.25m = 1.25m.
Sensitive cables should cross noisy cables at 90.
Never run sensitive cables close or parallel to the motor, dc link and braking chopper circuit
for any distance.
Never run supply, dc link or motor cables in the same bundle as the signal/control and
feedback cables, even if they are screened.
Ensure EMC filter input and output cables are separately routed and do not couple across
the filter.
Tripping on `overcurrent' as the cable capacitance is charged and discharged at the
switching frequency.
Producing increased conducted emissions which degrade the performance of the EMC filter
due to saturation.
Causing RCDs (Residual Current Devices) to trip due to increased high frequency earth
current.
Producing increased heating inside the EMC ac supply filter from the increased conducted
emissions.
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