Troubleshooting and fault elimination
8-8
48XX/49XXSHB0399
8.5.2 Checking the controller
Checking the power stage
Warning!
( The measurements described must only be carried out by specialists.
( Disconnect the controller from the mains.
( Tests should only be carried out when no voltage is applied!
Measurement Measuring point Measuring value
Semiconductor fuse
l
at the mains input
l
armature fuse
R 0 W
R 0 W
Internal fuses R 0 W
Thyristors Disconnect armature cables:
A B at the controller
B A at the controller
R
R
Field controller Disconnect field cables:
I+ , K-
I-, K+ (free-wheeling diode)
R
R > 200kW (diode 0.5V)
Checking the control board 4902MP
Checking the voltage supply:
( Wire up the controller completely
( Set controller inhibit (X2/28 open)
( Switch on the mains
Notes Measuring point Measured value
+Vcc 15V X2/20 X3/40 +14.25 V...+15.75 V
+Vref10 V X1/9 X3/40 +9.79 V...+10.21 V
-Vref 10 V X1/10 X3/40 -9.79 V... -10.21 V
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