
IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 216
6.6 Power Section Check
To perform a power section check, remove the VFD’s main and control wiring from the terminal strips. Obtain
reading as specified in the table below, and ensure that the reading falls within the normal reading range.
Table 6-8: Analog Ohmmeter (R x 1 Scale) or Digital Multimeter (Diode Test)
NOTE:
“+” could be any one of three (+) terminals which are labeled as
1,
2, and
3.
Device
VFD Terminal
Normal Reading
(Analog Meter)
Normal Reading
(Digital Meter)
Positive Lead
Negative Lead
Input Rectifier
Bridge
L1
+
7–100
0.299 ~ 0.675 VDC
L2
+
L3
+
-
L1
-
L2
-
L3
L1
-
Infinite
OL Displayed
L2
-
L3
-
+
L1
+
L2
+
L3
Bus Capacitors
+
-
Observe gradually increasing
resistance
Observe gradually increasing
voltage to OL
Output
Transistors
T1
+
7–100
0.299 ~ 0.675 VDC
T2
+
T3
+
-
T1
-
T2
-
T3
T1
-
Infinite
OL Displayed
T2
-
T3
-
+
T1
+
T2
+
T3
Braking Diode
B2
B1
10
0.299 ~ 0.675 VDC
B1
B2
Infinite
OL Displayed
B2
-
Infinite
OL Displayed
-
B2
Infinite
0.299 ~ 0.675 VDC
WARNING
Do NOT touch any circuit components while main power is on or immediately after main power is turned
off. You must wait until the red “CHARGE” lamp is extinguished, which may take up to 10 minutes for the
DC bus voltage to drop to a safe level. Failure to adhere to this warning could result in serious injury.
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