YASKAWA Servopack CACR-SR Series

22. Braking Transistor
The braking transistor is actually a triac. A triac acts like a diode except
that it can conduct in both directions. The braking transistor rectifies and
provides a return path through the braking resistor for the UVW voltage
from Diode Bridge #1.
T1
T2
Gate
23.
Braking Transistor Check
Test Equipment – Digital Multimeter
! Multimeter must be in Ω (Ohm) Position !
Step #
Multimeter
Positive Lead
Multimeter
Negative Lead
Expected Reading
(Ohm Check)
1 Gate T2
Approximately
1.65 M Ω.
2 T2 T1
Approximately
1.65 M Ω.
3 T1 Gate
Approximately
50-90 Ohm.
14
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