Lenze EDS4900U-REG - Manual (Page 253)

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 “ Š
R “ Š
Field controller Disconnect field cables:
I+ , K-
I-, K+ (free-wheeling diode)
R “ Š
R > 200k W (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 15 V X2/20 “ X3/40 + 14.25 V...+ 15.75 V
+ Vref 10 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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