Allen-Bradley PowerFlex 700H Hardware Service Manual page 34

2-18 Component Test Procedures
Checking the Main Fan
Inverters and Fans
Checking Inverter LEDs
A frame 12 drive has four fans and four fan inverters; two fans and two fan
inverters per Power Structure. Each fan inverter has a red and a green
diagnostic LED.
ATTENTION: The inverter LEDs are only operational when
!
the drive is energized, and only visible with the covers removed
from the power structure. Servicing energized equipment can be
hazardous. Severe injury or death can result from electrical
shock, burn or unintended actuation of controlled equipment.
Follow Safety related practices of NFPA 70E, ELECTRICAL
SAFETY FOR EMPLOYEE WORKPLACES. DO NOT work
alone on energized equipment!
LED
Red Green
Steady Steady
Off Flashing
Flashing Steady
Checking Fan Inverter Fuses
A pair of fuses (F1 and F2) feed DC Bus power to both inverters on each
Power Structure. Locate these fuses and, using a multi-meter, verify that
they are not open.
Isolating a Faulty Fan Inverter
The ASIC Board (one on each of the Power Structures) controls a pair of
fan inverters. A cable connects X11 on the ASIC Board to X8 on the
left-hand fan inverter. Another cable connects X3 of the left-hand fan
inverter to X8 on the right-hand fan inverter. A jumper terminates X3 on the
right-hand fan inverter. Refer to
procedure to isolate a faulty fan inverter if the fans are not running:
1. On Power Structure #1, disconnect the cable from X3 of the left-hand
inverter.
2. Remove the jumper from X3 of the right-hand inverter, and connect it to
X3 of the left-hand inverter.
3. Energize the drive. If the left-hand fan runs, then the right-hand fan
inverter is faulty.
4. Repeat steps 1 - 3 for Power Structure #2.
Indication
Inverter Idle
Inverter Running
Inverter Faulted
or
No Control from ASIC Board
Figure B.8 on page B-9. Use the following