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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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16. Regen Transistor

When the servomotor is turned off, there is still a voltage present across the main bus of the servo. The regen transistor acts as a switch with closes when the servo is turned off to allow this voltage through to the Y3 and Y4 terminals. Here it is dissipated across resistors 1 and 2. When checking the regen transistor, you are making sure it hasn’t been shorted across the emitter and collector.


Regen Transistor


17. Regen Transistor Check

Test Equipment – Digital Multimeter


Step # Multimeter Positive Lead Multimeter Negative Lead Expected Reading (Diode Check)
1 Base Collector Approximately 0.5 Volts.
2 Emitter Collector Approximately 0.4 Volts.
3 Emitter Base Approximately 0.7 Volts.


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