Technical Manual for EA350 Analog Pulse Type Servo Driver V101 : Request for power-on again : No braking resistor is connected (supported by SIZE B and C models) 251 Warning reason Inspection Handling method The parameter of power-on again is changed - When the parameter setting is completed, power on the device again Warning reason Inspection Handling method No braking resistor is connected 1: Check whether the short-circuit piece of the built-in braking resistor is connected (P+ and D) 2: When an external braking resistor is used, check whether lines are well connected 3: Test the braking resistor in the power failure status Upon wiring, power on the device again.
Replace the braking resistor