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Section 4.3:Testing Power Components
4.3.1 How to Check Power Components
Before checking the power components, be sure to disconnect the AC input supply and
wait until the main electrolytic capacitor (P1-N) discharges. This may take several minutes.
Fig. 4.3.1: SV200 Power Components Functional Diagram
Magnetic Contactor
R
S
T
U
V
W
P
N
B1
B2
Fuse
P1
G
E
GuP
EuP
GuN
EuN
GvP
GvN
GwP
GwN
EvP
EvN
EwP
EwN
Electrolytic
Capacitors
Dynamic
Braking
IGBT*
Charge Resistor
Input Diode Module Check
Check Points
Resistance to be Good
From R, S, or T to P
50k ohms or more
From R, S, or T to N
50k ohms or more
Charge Resistor Check
Check Points
Resistance to be Good
From P to P1
Resistance depending on Models.
DB (Dynamic Braking) IGBT*
Check Points
Resistance to be Good
From B2 to N
50k ohms or more
From G to N
A few kilo ohms
Output Diode Module Check
Check Points
Resistance to be Good
From U, V, or W to P1 and U, V, or W to N
50k ohms or more
Between Gate and Emitter of each IGBT
A few kilo ohms
Table 4.3.1: Power Component Test Values - All resistance values measured with multi-meter
leads From + to -.
*IGBT = Isolated Gate Bipolar Transistor
For more information contact: Sievert Crane and Hoist, (708) 771-1600, [email protected], www.sievertcrane.com