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TB246 Rev1 SD Drive Trouble Shooting
Purpose This document describes what to check when you are getting Γ439 Servo Drive Data Output ErrorΓ
Required Tools
Γ’Β’ Multimeter that can read 300VDC +/ 25VDC and diode check
Γ’Β’ Philips screw driver
Instructions
1 Power up the system with the electrical cabinet door open and E stop pushed in
2 Check fiber optic cables 4 thru 7 at the CPU10B and the SD drive Verify that they are snapped in to place Re seat
them and verify you have light coming from the CPU10B on fibers 4 6 & 7 and light from the SD drive on fiber 5 Also
make sure you are using shielded twisted pair ribbon cables for SDxB drives while SDx drives will have copper tape on
the ribbon cables
3 Are the green logic LED s lit up on the SD drive s ? Set multimeter to read above 300VDC Place the black lead on
Vm and the red lead on Logic Power Do you read approximately 300VDC? If yes proceed to next step If no trace
back logic power
4 Release E stop Measure across Vm+ and Vm and verify that you have approximately 300VDC On SD1/SD1B drives
you should also see the Vm power LED lit up as well If this is true proceed to next step If not trace back Vm power
5 Power system down Set meter to test for diode check and check all the fuses on the SD drive s If any fuses are
blown you will need to call Centroid Tech Support as the SD drive s will need repaired
6 With the meter still set for diode check place the black lead on Vm+ and then touch the red lead to U V & W on all
axes Verify that you measure approximately 0 35V If you measure 0V an IGBT is bad and the SD drive s will need
repaired
7 Repeat step 6 only now place the red lead on Vm and then touch the black lead to U V & W on all axes
8 Motor and cable test set your meter to highest Ohm setting 20M Put the black lead on BLUE GND wire of the motor
cable and touch the red to each one of the disconnected motor power leads The reading should be OL higher than
what the meter can read
Document History
Rev1 Created on 2011 04 08 by #240