inside the machine. Do not reach into the
machine or touch any internal part of the
machine, including resistors R9 and R10. Use
insulated gloves to measure the resistance
across these resistors.

9. Turn input supply power to the machine

ON. Machine output must be OFF.

10. Measure and record the DC voltage

across bleeder resistors R9 and R10.
Compare the voltage recorded to the
desired values in Table F.7, depending on
the input supply voltage setup.

11. Determine the difference between the two

bleeder resistor voltages.

For 380 VAC Input Voltage or Higher:

If the difference is less than 75 VDC, static
capacitive balance is okay.

If the difference is more than 75 VDC, sta-
tic capacitive balance is not okay. Perform
the Input Rectifier Test. Also visually
check input filter capacitors C1, C2, C3,
and C4 for any signs of damage; replace
the FET or IGBT assembly.

For 220 VAC Input Voltage:

The two resistance measurements should
be the same. If one or both is less than
175 VDC, perform the Main Contactor
Test and the Input Rectifier Test. Also
visually check input filter capacitors C1,
C2, C3, and C4 for any signs of damage;
replace the FET or IGBT assembly.

12. After the test is completed and the prob-

lem successfully repaired, install the
machine case sides and top.

13. Install the handle and the lift bail rubber

gasket.

POWER WAVE 450

WARNING

TABLE F.7

BLEEDER RESISTOR R9 AND R10 VOLTAGE VALUES

VAC INPUT

VDC ACROSS BLEEDER RESISTORS R9 AND R10

460 VAC

325 VDC

440 VAC

311 VDC

415 VAC

293 VDC

380 VAC

269 VDC

230 VAC

325 VDC

208 VAC

294 VDC