YASKAWA Servopack CACR-SR Series How To Check
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YASKAWA Servopack CACR-SR Series How To Check

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H
:
OW TO CHECK SERVOPACK
Labels (models number)
WWW.REDRIVE.ZOOVY.COM
1. Write down the model number of the drive. The model number starts
with CACR-SR*******
1

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Summary of Contents for YASKAWA Servopack CACR-SR Series

  • Page 1 OW TO CHECK SERVOPACK Labels (models number) WWW.REDRIVE.ZOOVY.COM 1. Write down the model number of the drive. The model number starts with CACR-SR*******...

  • Page 2: Fault Codes

    2. Before turning off the power, check what numbers or letters appear on the alarm display Alarm display WWW.REDRIVE.ZOOVY.COM 3. Fault Codes The fault code indicator is a LED display located on the control board. There are eleven possible codes – 1-7, A, B, C, and F.
  • Page 3 Fault Codes Detection Lighting Condition Probable Cause Corrective Action Goes ON when power is supplied to the * Defective control circuit board (1PWB) Check 1PWB control circuit. Goes ON when power is supplied to the * Defective current feedback circuit. * Check the PTM main circuit and servo power is turned * Defective main circuit transistor...
  • Page 4 Detection Lighting Condition Probable Cause Corrective Action Goes ON when power is supplied to the * Defective control circuit board (1PWB). * Check 1PWB. control circuit. Overload Goes ON during operation. Operation with 105% to 130% or more of * Check and correct the load (may be * When power to the control circuit is the rated load.

  • Page 5: Test Equipment

    4. The power must be OFF in order to check out the servo chassis by using a multi-meter. 5. Test Equipment The basic tool used for troubleshooting a Yaskawa servo is: WWW.REDRIVE.ZOOVY.COM Multimeter must be in Diode Position Digital Multimeter...

  • Page 6: Main Circuit Test Procedure

    6. Main Circuit Test Procedure This test procedure must be performed before replacing a servopack. Test Procedure Checklist Completed Check RSTUVW on the terminal block. Check the regen (regenerative) transistor. Check the diode bridge # 1. Check the diode bridge # 2. Check the braking transistor.
  • Page 7 Breaker Diode Bridge # 2 Power Transistor Module - PTM Resistor Module WWW.REDRIVE.ZOOVY.COM Braking Transistor Diode Bridge # 1 Regen Transistor Capacitor Thyristor Module...

  • Page 8: Terminal Block

    8. Power the power OFF. 9. If breaker is tripped, do not reset and power on, check terminals. Breaker WWW.REDRIVE.ZOOVY.COM 10. If breaker is blackened (burnt), need to replace servopack and check contactor (power supply to the servopack), it may need to be replaced too.

  • Page 9: Terminal Strip

    Note: Measured values (excluding 0L) vary with the power rating of the servo. Check for consistency. 12. Remove all wires from bottom of terminal strip (R-W) 13. Set your multimeter to a diode symbol and measure as follows: (your test leads form meter are the red and black) WWW.REDRIVE.ZOOVY.COM Black ≈.500...
  • Page 10 Terminal Block Terminal Block Check Test Equipment – Digital Multimeter Multimeter Multimeter Positive Negative Expected Reading Step # Lead Lead (Diode Check) WWW.REDRIVE.ZOOVY.COM Negative capacitor R, S, T Approximately 0.5 Volts must be terminal consistent with each other. Negative capacitor U, V, W Approximately 0.4 Volts must be terminal...
  • Page 11 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.

  • Page 12: Diode Bridge

    Diode Bridge #1 The diode bridge #1 is a component in the braking circuit. When the servomotor is turned off, the continued spinning of the motor generates a voltage across U, V, and W. The diode bridge directs the current from this voltage to the braking resistor to be dissipated.
  • Page 13 Diode Bridge #2 Diode bridges are used to rectify voltage wave patterns. In this case, the input voltage is the three phase AC voltage RST. In order for this voltage to be useful to the PTM, it must first be converted to a DC voltage pattern.
  • Page 14 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.
  • Page 15 . Resistor Module The braking resistor is primarily used to dissipate the current created by the voltage which is generated by the spinning servomotor after the servo has been shut off. Usually this resistor needs to be replaced if it is cracked or physically damaged in a similar way.
  • Page 16 Thyristor Module The Thyristor module is composed of both diodes and silicon-controlled rectifiers. The Thyristor is the main component which contributes to the conversion of the AC input voltage to the DC voltage used to power the servomotor. R, S, T WWW.REDRIVE.ZOOVY.COM Thyristor Module Check Test Equipment –...

  • Page 17: Cooling Fan

    Cooling Fan Only the SB 60 and BB 20+ units have a cooling fan that blows air across the heat sink on the back of the unit. If the cooling fan is not working properly, the servo will trip on an overheat fault. Visually check the cooling fan to make sure it turns freely.

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