Drive Speed Drops Sharply Under Load; Leds Not Lighting Up; Drive Protection Trips Immediately; Troubleshooting For The Servo System - Danfoss VLT ISD 511 Operating Manual

VLT® Servo Drive System ISD 511
Operating Guide

9.2.10 Drive Speed Drops Sharply under Load

Possible cause
• Drive is running at current limit.
• Drive is running with incorrect parameters.
Troubleshooting
• Check the application.
• Check the parameter settings (control loop parameters and user limits).

9.2.11 LEDs not Lighting Up

Possible cause
• No power supply.
Troubleshooting
• Check the power supply.

9.2.12 Drive Protection Trips Immediately

Possible cause
• Short circuit.
• Incorrect control loop parameters.
Troubleshooting
• Check the parameter settings.
• Check the wiring.
• Contact Danfoss.

9.3 Troubleshooting for the Servo System

9.3.1 LCP Display is Dark/Not Functioning

This fault applies to the ISD 511 servo drives, PSM 510, DAM 510, and ACM 510.
Possible causes
• Missing input power.
• Missing or open fuses or circuit breaker tripped.
• No power to the LCP.
• Incorrect contrast setting.
• Display is defective.
Troubleshooting
Table 26: Fault, LCP Display is Dark/Not Functioning
Possible cause
Missing input power.
Missing or open fuses or circuit breaker tripped.
No power to the LCP.
Incorrect contrast setting.
Display is defective.

9.3.2 Open Power Fuses or Circuit Breaker Trip

This fault applies to the PSM 510 and DAM 510.
98 | Danfoss A/S © 2023.08
Possible solution
Check the input power source.
Check the fuses and circuit breaker.
• Check the LCP cable for proper connection or damage.
• Replace any faulty LCP or connection cables.
Press [Status] + [▵]/[▿] to adjust the contrast.
Replace the faulty LCP or connection cable.
Diagnostics
AQ377148425069en-000101 / 130R1213