Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 73)

2-38 Drive Installation
7000-UM150I-EN-P – June 2013 7000 “B” Frame
The installer is responsible for ensuring that power connections are
made with appropriate torque. (Refer to Appendix B "Torque
Requirements" in back of manual.)
The drive is supplied with provision for grounding of cable shields
and stress cones near the power terminals.
Power and Control Wiring
Drive line-ups (i.e. Drive and Input Starter) which are delivered in
two or more sections, for ease of handling, will require that the
power and control wiring be re-connected. After the sections are
brought together, the power and control wiring is to be re-connected
as per the schematic drawings provided.
Control Cables
Control cable entry/exit should be located near the terminal block
'TBC' – the customer's connections are to be routed along the
empty side of the TBC terminals. These terminals are sized to
accept a maximum AWG #14 wire gauge. The low voltage signals
(includes 4-20mA) are to be connected using twisted shielded
cable, with a minimum AWG #18 wire gauge. (Based on using a
W4 terminal block for customer connections, comparable wire
sizes would be 0.5 – 4 mm
2 as equivalent to #22-#10 AWG.)
Of special concern is the tachometer signal. Two tachometer inputs
are provided to accommodate a quadrature tachometer (senses motor
direction). The tachometer power supply is isolated and provides
+15 Volts and a ground reference. Many tachometer outputs have an
open collector output, in which case a pull-up resistor must be added
to ensure that proper signals are fed to the system logic. (Refer to
Appendix A "When is a Tachometer Required?" to see if one
needs to be supplied.)
I M P O R T A N T I M P O R T A N T Low voltage signals are to be connected using
twisted shielded cable with the shield connected at
the signal source end only. The shield at the other
end is to be wrapped with electrical tape and
isolated. Connections are to be made as shown on
the drawings provided.