Lenze 4800 Manual page 253

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Troubleshooting and fault elimination
8.5.2
8-8
48XX/49XXSHB0399
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
Semiconductor fuse
l
at the mains input
l
armature fuse
Internal fuses
Thyristors
Field controller
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
+Vcc 15 V
+Vref 10 V
-Vref 10 V
Measuring point
Disconnect armature cables:
A “ B at the controller
B “ A at the controller
Disconnect field cables:
I+, K-
I-, K+ (free-wheeling diode)
Measuring point
X2/20 “ X3/40
X1/9 “ X3/40
X1/10 “ X3/40
Measuring value
R 0 W
R 0 W
R 0 W
R “ Š
R “ Š
R “ Š
R > 200kW (diode 0.5V)
Measured value
+ 14.25 V...+ 15.75 V
+ 9.79 V...+ 10.21 V
-9.79 V... -10.21 V