Rockwell Automation 20C-DG01 PowerFlex 700H AC Drive Safe Torque Off Option - Manual (Page 14)

14 Rockwell Automation Publication 20C-UM001B-EN-P - June 2011
Chapter 2 Installation and Wiring
Safe Torque Off Option
Board Installation
1. Turn off and lock out input power. Wait five minutes.
2. Verify that there is no voltage at the drive’s input power terminals.
3. Measure the DC bus voltage at the DC+ & DC- terminals on the Power
Terminal Block. The voltage must be zero.
4. Open the door of the enclosure that contains the control and I/O circuit
boards and unplug any I/O cables from the I/O board in Slot B.
ATTENTION: To avoid an electric shock hazard, verify that the voltage on
the bus capacitors has discharged completely before servicing. Check the
DC bus voltage at the Power Terminal Block by measuring between the
+DC and -DC terminals, between the +DC terminal and the chassis, and
between the -DC terminal and the chassis. The voltage must be zero for all
three measurements.
Remove power before making or breaking cable connections. When you
remove or insert a cable connector with power applied, an electrical arc may
occur. An electrical arc can cause personal injury or property damage by:
•
sending an erroneous signal to your system’s field devices, causing
unintended machine motion
•
causing an explosion in a hazardous environment
Electrical arcing causes excessive wear to contacts on both the module and
its mating connector. Worn contacts may create electrical resistance.
IMPORTANT Before removing connections and wires, mark the connections and wires
to avoid incorrect wiring during assembly.
L1 L2 L3
O
I