Rockwell Automation 7703E Medium Voltage SMC OEM Components - 10-15 kV - Manual (Page 39)

Rockwell Automation Publication 7703E-IN001E-EN-P - July 2014 39
Chapter
7
Final Test Procedures
Final Test Procedures
• Verify that the enclosure is properly grounded.
• Verify that phase-to-phase and phase-to-ground clearances meet the
requirements of the local electrical code.
• Visually check for sufficient electrical clearances, creepage allowances and
bend radii. Refer to the applicable local electrical codes.
• Check the tightness of all power and control connections. Refer to
Table 4
on page 13 for recommended torque values. Gently tug on all wires to
ensure that they are properly connected.
• Check for cross-threaded hardware. In addition to the regular power
connections, check the connections and wiring to the voltage sensing
board.
• The high voltage silicone-insulated wires must be identified with tube
markers. Avoid routing the wires over any components. If the wires are
routed near live parts or ground, there must be enough slack in the wire to
allow at least 15 cm (6 in.) of creep or clearance between the wire and
other parts. Tie wraps must not tightly squeeze the high voltage wires, and
must not be put on with a tie-wrap gun.
• Do not remove the plastic plugs from unused fiber optic transmitters on
the circuit boards.
• Verify that the fiber optic cables between the interface board, fiber optic
multiplexer board, and the gate driver boards are connected to the correct
power phase.
• Check the routing of the twisted pair of red and white cathode and gate
wires from the SCRs. They can safely touch the heatsink on the side of the
SCR that they are exiting; however, they must not touch the heatsink on
the other side of the SCR. The wires must be properly supported to ensure
this condition is met. See wiring diagrams in
Appendix B for the
sequences.
• Wiring to the voltage sensing board from the power stacks must be rated
for the line voltage. Rockwell Automation recommends UL style 3239,
#18 AWG, 40 kV DC silicone rubber insulated wire covered with PVC
tubing or other suitable material for this application. These wires must not
touch live parts, grounded metal or low voltage wiring.
ATTENTION: All hardware for electrical connections must be torqued to the
above specifications. Failure to do so may result in electrical faults causing
personal injury or damage to the equipment.