The fault indicator lights are to be used as an aid to determining the location and nature of a drive failure. A brief description is delineated below. For further detailed information on probable failure conditions, refer to the Troubleshooting Procedures located in the troubleshooting section.

DS1	"BUS LOW": DC BUS UNDERVOLTAGE An "ON" light indicates that the DC bus voltage was less than approximately 250V DC.
DS2	"O.V.": DC BUS OVERVOLTAGE An "ON" light indicates that the DC bus voltage was greater than approximately 380V DC.
DS3	"O.C.": OUTPUT OVERCURRENT An "ON" light indicates that the load current has exceeded 150% of the rated drive current.
DS4	"LINE OUT". LINE REMOVAL OR TRANSIENT An "ON" light indicates that the input line voltage is momentarily removed, or that there is a negative, transient. The light does not stay on.
DS5	"PROT": PROTECTION An "ON" light indicates that there was an overcurrent in one or more legs of the transistor inverter bridge. This is usually an indication of a failed power transistor module, or of an external short circuit.

To view the Control Assembly, the hinged panel holding the Logic Assembly, must be swung back. The fault indicator lights will then be visible as shown. An "OFF" light indicates a fault condition as shown above

• DS1: RELAY 2CR NOT ENERGIZED
• DS2: RELAY 3CR NOT ENERGIZED

The fault indicators located on the Control Assembly are used as an aid to determining the location of a power fault; however, an "OFF" light occasionally indicates a defect elsewhere as well. A brief description is presented above. For detailed information on probable failure conditions, refer to the Troubleshooting Procedures located in the troubleshooting section.

Back to top