4-13 890CS & 890CD Common Bus Units
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
Key to Wiring Diagram
A
Analog Clean Earth
This must be insulated from the back panel. Analog reference X12/01 or digital reference
X14/04 must be connected to this busbar, avoiding earth loops.
B
Back-plate Earth the backplate to the star point (G).
C
Cubicle
The 890 must be mounted inside a cubicle complying with the European safety standards
VDE 0160/EN50178.
D
Control Wiring
Control terminals are SELV (Safe Extra Low Voltage), i.e. double-insulated from power
circuits. 0.08mm
2
(28AWG) to 2.5mm
2
(12AWG).
E
Dirty Earth This must be insulated from the back panel. It is used for all power earths.
F
Filter (optional)
Refer to Chapter 7: "Associated Equipment" for the specified filter. This may help to
achieve EMC compliance. Refer to Appendix C.
G
Star Point Earth/Ground
The star point connects all earth busbars. Connect the star point to the incoming safety
earth (PE). Note the possible requirement for PE2 connections to each drive, refer to page
4-9.
H
Brake Resistor
(DC+, EXT: frames B & C)
(DBR+, DBR-: frame D)
External brake resistors are available for the 890CS unit. Refer to Chapter 7: "Associated
Equipment". Ensure wiring is rated for highest system voltage.
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