Yaskawa GPD 506/P5 Section One - Manual (Page 28)

PP.P5G5.01.Troubleshoot
Page 28
Rev. 06/11/2003
Soft Charge Resistor Check for 18 kW through 160 kW models:
The first step is a visual inspection. Many times a damaged soft charge resistor has physical
damage, such as burn marks, discoloration, or has been broken into pieces. If there is no
physical evidence of damage, a check with an ohmmeter must be performed. Locate the soft
charge resistor(s) inside the inverter unit. With an ohmmeter set to the R x 1 scale, measure
across the resistor(s). If the resistor(s) is damaged, the measured value will be infinite ohms
(burned open).
Soft Charge Contactor Check for 18 kW through 160 kW models :
With an ohmmeter set to the R x 1 scale or the ohm setting, measure across the contacts
and press in the plunger. On smaller capacity inverters, the contactor may be totally
enclosed and this step can not be performed. When the plunger is pushed in, the resistance
across the contacts should read 0 ohms. When the plunger is released, the resistance will be
the ohmic value of the soft charge resistor
With an ohmmeter set to the R X 1 scale or the ohm setting, measure across the 230V coil,
the resistance should be close to 175 ohms. Measure across the 24V auxiliary coil, the
resistance should be about 2.2M ohms. These values may vary dependent upon the model
being tested. The coils can be tested by applying the appropriate voltage and verifying that
the contacts change states.
Soft Charge Resistor/Contactor