1949

Category: Warning

Cause

1. External braking resistor wiring has poor contact, is disconnected or is broken.
2. When the built-in braking resistor is used, the cable between power terminals P and D is broken or disconnected.
3. When an external braking resistor is used, 2002-1Ah (braking resistor setting) is selected incorrectly.
4. When an external braking resistor is used, its actual resistance is too high.
5. 2002-1Ch (external braking resistor resistance) exceeds the actual external braking resistor resistance.
6. Main circuit input voltage exceeds the specified range.
7. Load inertia ratio is too large.
8. Motor speed is too high and deceleration does not finish within the configured deceleration time; during cyclic motion the motor remains continuously decelerating.
9. Servo drive capacity or braking resistor capacity is insufficient.
10. Servo drive fault.

Corrective action

1. Remove the external braking resistor and directly measure whether its resistance is ∞ (infinity); measure whether resistance between P and C is ∞ (infinity). Replace the external braking resistor. After confirming that measured resistance matches its nominal value, connect it between P and C. Use sound cables to connect the two ends of the external braking resistor to P and C respectively.
2. Measure whether resistance between P and D is ∞ (infinity). Directly connect P and D with a sound cable.
3. Refer to 5.4.3 Braking settings and set 2002-1Ah: 2002-1Ah=1 (external resistor, natural cooling) 2002-1Ah=2 (external resistor, forced-air cooling)
4. Select a resistor with appropriate resistance according to table 7-3 IS620N series braking resistor specifications.
5. Set 2002-1Ch to match the actual external resistor resistance. 3/4/5. Check 2002-1Ah; measure the actual external resistance between P and C and compare it to determine whether it is too high; check whether 2002-1Ch exceeds the actual external resistance between P and C.
6. Measure whether the main circuit input voltage at the drive side meets the following specifications: ◆220V drive: RMS value: 220V240V; permissible deviation: -10%+10% (198V264V). ◆380V drive: RMS value: 380V440V; permissible deviation: -10%+10% (342V484V). Adjust or replace the power supply according to specifications.
7. Refer to 6.2 Inertia identification to identify rotational inertia, or manually calculate total mechanical inertia from the mechanical parameters. Check whether the actual load inertia ratio exceeds 30.
8. Inspect the motor speed curve during cyclic motion to determine whether the motor remains in deceleration for a long time.
9. Inspect the motor speed curve for a single cycle and calculate whether maximum braking energy can be fully absorbed. 7/8/9. Use a higher-capacity external braking resistor and set 2002-1Bh to match its actual value; use a larger-capacity servo drive; where permitted, reduce the load, increase acceleration/deceleration time, and increase the motor operating cycle.
10. Replace the servo drive with a new one.