g) Connection of surge absorber
When an exciting coil of an electromagnetic contactor, relay or the like in the control circuit or periphery circuit
of the converter is opened or closed, surge voltage (noise) generates according to a steep change of the current.
This surge voltage may cause malfunction of the converter control circuit or peripheral devices. If this happens,
connect a surge absorber at both ends of the faulty coil.
X
Y
Z
AC
DC
+
-
Diode
S2-A-O
or
S1-B-O
S2-A-O
or
S1-B-O
Exciting
coil
Figure 3.3-10 Connection of Surge Absorber
3-16
