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WARNING
ELECTRIC SHOCK can kill.
With input supply power ON, there are high voltages 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.
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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 |
