Siemens MICROMASTER 420 Error A0502: Overvoltage limit

Siemens MICROMASTER 420 inverter · taken from the manufacturer’s manual, pages cited

Warning codeA0502

The inverter has detected an overvoltage condition that exceeds the allowable limit. The manual's first action is: “Check that mains supply voltage is within allowable range”

Model
Siemens MICROMASTER 420
Display shows
Overvoltage limit (A0502)
Type
Warning code
Source
Manual p. 72

What A0502 means

Overvoltage limit p. 72

Common causes

  • Mains supply too high p. 72
  • Load regenerative p. 72
  • Ramp-down time too short p. 72

What to do

  1. Check that mains supply voltage is within allowable range p. 72
  2. Increase ramp down times p. 72

Before you service the product, read the safety instructions in the manual p. 6.

If A0502 is still not resolved

  • Contact your service dealer or qualified personnel for assistance. p. 72
    “Check that mains supply voltage is within allowable range”
Open the manual at page 72 All MICROMASTER 420 error codes Manual details & download

This page summarises what the manufacturer’s manual says about A0502; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.