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TROUBLESHOOTING E50 FAULT
WHAT IS AN E50 FAULT - An E50 fault is a brake slip detection fault. This will occur when a brake slip is detected, and the next brake
slip detection test has passed usually when a load is removed or on the ground. This fault is used to alert and track that a brake slip
has been detected and the motor brake should be inspected immediately before using the hoist again.
HOW IS AN E50 FAULT DETERMINED – When the VFD is operating in closed loop vector control only (AA121 = 10) at the end of a lift
cycle the motor brake is commanded to close. Once the motor brake is closed the VFD will log the encoder pulse count before the test
ted the
current encoder pulse count is compared against the logged encoder pulse count. If the encoder pulse count deviates by the value in
parameter UE-35 = 5 pulses, then a brake slip is determined to have occurred.
The Brake Slip Detection Pulse Count monitor db-16 will display the pulses detected during the brake slip detection test. You can use
this monitor to see how many pulses / how much movement is occurring during the test.
•
• he smallest air gap allowed
in the brake spec.
• c
• on test indicates there is a slip detected. If there is no
encoder shield or drain is terminated to a ground source either a ground lug or 0v terminal when connected to the main
body digital inputs on the VFD. DO NOT CONNECT THE ENCODER SHIELD OR DRAIN TO THE VFD POWER GROUND
TERMINAL.
• terminated, try adding ferrite core clamps
around the encoder wire with a minimum of (2) turns around the ferrite core.
• Contact Detroit Hoist for further assistance.
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