4-25
890CS & 890CD Common Bus Units
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
Cable Gland Requirements
Use a metal gland to connect to the internally earthed gland plate. It must be capable of securing a 360
degree screened connection to give EMC compliance. A 360 degree screened connection can be achieved as
shown.
360 Degree Screened Connection
Protective Earth (PE) Connections
The unit must be
permanently earthed
according to EN 50178 - see below. Protect the incoming mains
supply using a suitable fuse or circuit breaker (circuit breaker types RCD, ELCB, GFCI are not
recommended). Refer to Chapter 7: Circuit Breakers.
IMPORTANT
The drive is only suitable for earth referenced supplies (TN) when fitted with an internal filter.
External filters are available for use on TN and IT (non-earth referenced) supplies.
For installations to EN 50178 in Europe:
♦
for permanent earthing, two individual incoming protective earth conductors (<10mm² cross-section) or
one conductor (>10mm² cross-section) are required. Each earth conductor must be suitable for the fault
current according to EN 60204.
Refer to Appendix C: “Certification".