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Home > Services > Technical Documents > How To Check A Yaskawa CACR**** Servpack

How To Check A Yaskawa CACR**** Servopack

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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.


Braking Transistor


23. Braking Transistor Check

Test Equipment – Digital Multimeter

! Multimeter must be in Ohm Position !


Step # Multimeter Positive Lead Multimeter Negative Lead Expected Reading (Ohm Check)
1 Gate T2 Approximately 1.65 M Ohm.
2 T2 T1 Approximately 1.65 M Ohm.
3 T1 Gate Approximately 50-90 Ohm.


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