Rockwell Automation 7703E Medium Voltage SMC OEM Components - 10-15 kV - Manual (Page 42)

42 Rockwell Automation Publication 7703E-IN001E-EN-P - July 2014
Chapter 7 Final Test Procedures
Power Supply Test
1. Isolate incoming power
2. Open the door(s) providing access to the SCR/heatsink assemblies. You
will be touching components which are connected to the high voltage
power circuit, so be sure to isolate power as stated above.
3. Apply rated control voltage to the control circuits from a separate control
source, or by plugging into the test source connector, and selecting the
TEST position of the control switch.
4. Check voltage on each gate-driver board by connecting a DC voltmeter at
TP4(+) and TP3(-). (See Figure 21 .) The voltage should be
18…22V DC.
5. Locate the SMC Flex Interface board in the control section (See
Figure 20 ). This circuit board has the control module mounted on it.
Locate the switch labeled
SW2 at the upper left corner of the board. Close
the switch by sliding the toggle up. This starts a pulse generator to supply
simulated gate-pulse signals via fiber optic cables to the gate driver boards.
A red LED beside the switch, and the three yellow LEDs on the left side of
the Interface board should be lit.
Note: They may appear dim, depending on ambient light conditions.
Figure 20 - Interface PCB
ATTENTION: Servicing energized industrial control equipment can be
hazardous. Severe injury or death can result from electrical shock, burn, or
unintended actuation of controlled equipment. Before proceeding, ensure that
all sources of power are isolated and locked out. Verify that all circuits are
voltage free using a hot stick or appropriate voltage measuring device. Any
covers or barriers removed during this procedure must be replaced and securely
fastened before energizing equipment. Where appropriate, the case of test
equipment should be connected to ground.
SW2 – Close (slide up) to initiate test pulse
Red LED – ON when test pulses active