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Chapter 6 Troubleshooting IS620P User Manual 18. Er.400: Main circuit overvoltage Cause: The DC bus voltage between P and - exceeds the overvoltage level. •• 220 V drive: normal value: 310 V, overvoltage level: 420 V •• 380 V drive: normal level: 540 V, overvoltage level: 760 V Cause Confirming Method •• Check the power input specification of the drive. Measure the RST input voltage on the servo drive side and check whether the input voltage complies with the following specification. 1.The main circuit input voltage is too high 220 V drive: Effective value: 220 to 240 V Allowed error: -10% to 10% (198 to 264 V) Corrective Action Replace the power supply or adjust the power voltage according to the specification on the left. 380 V drive: Effective value: 380 to 440 V Allowed error: -10% to 10% (342 to 484 V) 2. The power supply is instable or affected by the lightning strike. •• Check whether the power supply is instable, affected by the lightning strike or satisfies the preceding specification. Connect a surge suppressor and then connect the power supply. If the fault remains, replace the servo drive. •• If the resistance is ∞, wire breaking occurs. 3. The regen resistor fails. •• If internal regen resistor is used (H02-25 = 0), check whether P and D are connected with a cable reliably. If yes, measure the resistance between C and D. •• If external regen resistor is used (H02-25 = 1/2), measure the resistance between P and C. •• For the regen resistor specification, refer to section 1.4 Regen Resistor Specifications. - 134 - •• If internal regen resistor is used and the resistance is 0, use external regen resistor (H02-25 = 1/2) and remove the cable between P and D. Select external regen resistor of the same resistance and power as internal regen resistor. •• If external regen resistor is used, connect a new regen resistor between P and C. •• Make H02-26(Power of external regen resistor) and H02-27 (Resistance of external regen resistor) consistent with the used external regen resistor specification.
