TROUBLESHOOTING
Service Manual M4 - M10
11.07.2002
Page
41
F21
Measure 24V auxiliary voltage across terminals
6-7, 12-13 on control board
F21 24V SUPPLY
Disconnect load from source and measure open
circuit voltage across terminals 6-7, 12-13 on
control board
Clear fault memory
24V source
OK
Replace control board with functioning one
according to instructions on section 9.3.6.
Replace defective parts as recommended in
spare part lists
Load software into Control board according to
instructions on section 12 and set parameters
24V source is loaded excessively by an external
circuit Iout > 100mA
Make corrective measures to external control
circuit
NO
24V source
OK
F21
YES
YES
NO
NO
YES