AMETEK i-iX Series II - Manual (Page 153)

User Manual California Instruments
i Series II / iX Series II / iM Series II 153
7.4.4 Fuse Check
See Figure 5-3 and Figure 5-5. Check the fuse F1 on the AC power board at the top of the unit
using the ohmmeter. If the fuse is open do not replace but check all the IGBT’s. To check the
IGBT’s connect the positive lead of the ohmmeter to the collector (center leg) and measure the
resistance to the gate and the emitter (outside legs) of each IGBT. If the resistance reading is
lower than 1000 ohms it indicates a blown IGBT. The IGBT’s are not field replaceable and the
module should be returned to the factory for exchange or repair. See paragraph 7.4.6. for
disassembly instructions. If a low resistance reading is not found, replace the fuse and proceed
with the check procedure.
Check the fuse F1 on the end of the input/output board. If the fuse is blown do not replace but
proceed to paragraph 7.4.6 for disassembly instructions and remove the AC power board. With
the AC power board removed check the IGBT’s Q2 through Q9 using the procedure detailed in
the paragraph above. See Figure 6-1: Internal Top View of DC-DC Converter Board.
If one or more IGBT’s show a low resistance reading do not replace the fuse but return the
module to the factory for exchange or repair. If a low resistance is not found, replace the fuse
and carry on with the check procedure.
7.4.5 Power-on Troubleshooting Using the LED’s.
If no fuses were blown or if fuses were found blown but all the IGBT’s checked out as good,
replace blown fuses and reconnect power to the unit.
WARNING: Do not touch any parts inside the unit during this test as they will
be live and dangerous. Always wear safety glasses.
Auxiliary PS: Turn the main breaker on and check the LED’s on the AC logic board.(see Figure
5-4). The +15V (DS2-red), -15V (DS3-green), and the 24V (DS7-amber) LED’s located at the
top right of the board should all be lit. The 8V logic supply LED (DS4- red) should be lit. On the
AC power board (see Figure 5-5) the three gate drive power supply lights, DS5-green, DS6-
amber, and DS7-red, should all be lit. If any of these LED’s are not lit then the most likely cause
is a blown fuse. These logic power fuses are all located on the DC-DC board. Switch the unit
off at the front panel breaker and remove the input power.
Wait 10 minutes to allow the capacitors to discharge
before attempting to disassemble the unit.
Proceed to paragraph 7.4.6. for disassembly instructions. Remove the AC power board and
locate the P.C. mount fuses F2 through F10 (see Table 7-2 for fuse functions). Replace any
blown fuses. Always replace fuses with same type and rating. (See Table 8-2.)