Table 7-3 Control Signal Cabling General Guidelines - Siemens SINAMICS PERFECT HARMONY GH180 Operating Instructions Manual

Encoder Feedback, Analog I/O, and Digital I/O Signals into the VFD
● Fully shielded cable must be used for analog I/O and low voltage (< 50 V) digital I/O
wiring to the VFD. For isolated I/O, the shield must be grounded at only the VFD.
Twisted pair should be used for applications using differential signaling or when the return
path of the signal is also present.
– The shield grounding termination point should be at the customer terminal strip point of
● 220 VAC digital I/O driven by semiconductor based switches (not dry contacts) must use
twisted shielded pair with a return path per signal.
● Check customer-side wiring for 'ground loops' (should be avoided).
● Do not install cable with MV wiring. Siemens recommends installing the cable in a
separate metal conduit.
● Install digital and analog signals in separate metal conduit from each other and from the
power wiring.
Note
Minimum shielding assumes foil shield with drain wire. Siemens recommends using double
shielding using foil and braid.
● The shield connections of all the WAGO I/O need to terminate at a common point on the
drive end. Test shield connection (using ohm meter) to verify a good connection.
● Encoder applications assume a galvanically isolated encoder using HTL quadrature output.
Table 7-3 Control Signal Cabling General Guidelines
Signal Type
AI
AO
DI (24 V)
DI (120 V)
DO( 24 V)
DO (120 V)
CR3 (24 V)
CR3 (120 V)
Notes:
Best Practice is to use cable with double shielding
*
All signals specified in the above table are galvanically isolated
References: GAMBICA Variable Speed Drives and Motors;
2012
VFD Customer 3-Phase Control Cabling
The 3-phase control cable wiring to the VFD must use fully shielded cable with shield grounded
at the VFD only,
Each customer input section is supplied with a ground pad (lug).
Air Cooled 6SR5
Operating Instructions, 07/2018, A5E42736645A_AB
cable entry to the cabinet.
Cable
Twisted Shielded Pairs
Twisted Shielded Pairs
Twisted Shielded Pairs
Twisted Shielded Pairs
Twisted Shielded Pairs
Twisted Shielded Pairs
Twisted Shielded Pairs
Twisted Shielded Pairs
7.3 Grounding, Cabling, and Shielding Recommendations
Recommended Termination Point
VFD
*
VFD
*
VFD
VFD
VFD
VFD
VFD
VFD
Installation Guidelines for Power Drive Systems Fourth Edition,
Electrical Connections
61