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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
Possible solution
Missing input power.
Check the input power source.
Missing or open fuses or circuit breaker tripped.
Check the fuses and circuit breaker.
No power to the LCP.
Check the LCP cable for proper connection or damage.
Replace any faulty LCP or connection cables.
Incorrect contrast setting.
Press [Status] + [
▵
]/[
▿
] to adjust the contrast.
Display is defective.
Replace the faulty LCP or connection cable.
9.3.2 Open Power Fuses or Circuit Breaker Trip
This fault applies to the PSM 510 and DAM 510.
AQ377148425069en-000101
/ 130R1213
98 | Danfoss A/S © 2023.08
Diagnostics
VLT® Servo Drive System ISD 511
Operating Guide
