Rockwell Automation Publication MOTION-AT007A-EN-P - May 2020 29
Non-regenerative Common DC-bus Configurations With Passive or Active Shunt Chapter 3
Disconnect Switch Considerations
If a disconnect switch is used between the common DC-bus and a PowerFlex 750-Series drive input, connect an auxiliary contact on the
disconnect switch to a digital input of the drive. The corresponding digital input must be set to Precharge Enable. This setting provides the
proper precharge interlocking, which guards against possible damage to the drive when reconnecting the drive to an energized DC-bus.
Under this condition, the drives must have an internal or externally supplied precharge. Precharge handshaking is required before inverter
operation.
When an external precharge device is required, a fuse combination switch can be used. These switches provide precharge of capacitive
loads, have integrated fuse protection, and perform automatic pre-load type functions with an internal coil.
Input and Output Signals
For the Kinetix 7000 drives, wire the control and interface signals on the General Purpose Relay (GPR) connector as described in the following
table. See the Kinetix 7000 High Power Servo Drives User Manual, publication 2099-UM001
, for more information on the terminal block
connections.
Table 13 - PowerFlex 750-Series Drive Precharge Parameter
Parameter
Digital Input
Number Setting
189 [DI Precharge] See PowerFlex 750-Series AC Drives Programming Manual, publication 750-PM001
ATTENTION: To avoid personal injury and/or equipment damage, make sure installation complies with specifications regarding wire
types, conductor sizes, branch circuit protection, and disconnect devices. The National Electrical Code (NEC) and local codes outline
provisions for safely installing electrical equipment.
ATTENTION: The Kinetix 6000 (400V-class), Kinetix 6200/6500, Kinetix 7000, and PowerFlex 750-Series (Frames 5 and 6) AC input
drives have no method for you to control the precharge sequence. To avoid sever drive and/or equipment damage due to uncontrolled
precharge, do not connect these drives to an energized bus. If a disconnect switch is used between the inputs of the drives and the
common DC-bus, an external precharge device must be used.
Table 14 - General Purpose Relay Connections
Signal Terminal Description
Recommended Wire Size
mm
2
(AWG)
Strip Length
mm (in.)
Torque Value
N•m (lb•in)
DRIVE OK+ 5 Programmable N.O. Relay 2 output 0.75 (18)
(stranded wire with ferrule)
1.5 (16)
(solid wire)
7.0 (0.275) 0.235 (2.0)
DRIVE OK- 6 Programmable Relay 2 common
ATTENTION: For the Kinetix 7000 drives, wiring the DRIVE OK signal on the General Purpose Relay is required. To avoid injury or
damage to the drive, wire the DRIVE OK relay into your control string.
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