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TB286 Rev1 Troubleshooting the Drive Motor Voltage VM Supply
This document focuses on how to troubleshoot systems that are not receiving any drive power to the motor voltage terminals or
VM Seen in label 9 of figure 2 on the next page
Signs that you might not have any motor supply voltage includes errors such as Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½410 X axis 1 position errorÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½SV_STALL
ERROR ReportedÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½411 X axis 1 full power without motion Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½Stall job canceledÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ etc as seen below in Figure 1
Continued on next page
Page 1 of 3 Lasted Edited on 8/29/14 by #269Figure 1
Explanation of Centroid systems
All Centroid systems have the same basic set up as seen in the picture below
1 AC Power Single phase two phase or three phase AC power enter the system
2 Rectifier AC power enters a AC to DC converter known as a rectifier Sometimes the rectifier is called the Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½Cap boardÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½
because it contains an extremely large reservoir capacitor
3 Contactor The high voltage DC power goes through an E stop contactor The E stop contactor can stop the machine by
removing the motor voltage from the drive in the event of an emergency or fault The E stop contactor is normally open
requiring power to close the contactor
4 E Stop During an emergency an E stop switch is used by the operator to stop the machine A double pole single throw
DPST twist to release E Stop switch is used The switch is wired so that it is normally closed when the machine is in it's
operational state That way if a wire brakes the E stop is tripped
5 E Stop Input All systems with a PLC will have a E stop input to tell the software when E stop has been pressed On
newer systems this is input 11 on older systems this is input 1
6 Fault Relay All Centroid systems have at least one fault relay If the drive or PLC detects a fault it is able to stop the
machine by removing power from the motors Depending on your system the fault relays are located on the drive drive
fault relays PLC PLC fault relays or both If you have multiple products with a fault relay ALL fault relays are wired in
series allowing ANY device with a fault relay to stop the machine
7 Contactor Power Supply The contactor power supply provides the contactor with power Usually in the form of a step
down AC transformer 24VAC typical
8 DC Input Power Supply DC Input Power Supply An external power supply is needed to power the I/O on the PLC This
power supply can be 5 12 or 24
9 VM The high voltage enters the drive though the motor voltage input or VM This includes the VM+ and VM terminals
On some systems VM may be just labeled Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½GNDÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ or Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½GroundÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½
Page 2 of 3 Lasted Edited on 8/29/14 by #269Contactor Power
Supply
24VAC Typical Rectifier
DC Input Power Supply
5 12 24 VDC Typical
DC Motor PowerFault Relay
VME Stop
Input Drive / PLCAC Power
E Stop
Switch E Stop
Contactor
1 2 3
94 6
5 7
8
Figure 2
Page 3 of 3CHECK FOR POWER
When the E Stop is
released does each
drive measure between
100 Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ 340 volts DC on
the VM terminals?
YesStart Here
Check for blown fuses before starting!
Start the control software then follow
this flow chart
SOFTWARE / HARDWARE ERRORS
From the main menu press F3 MDI Is the software
showing any errors in the message window? Are the
devices themselves physically displaying any error
codes?This technical bulletin
does not apply
Yes
WIRING PROBLEM
Power down the system Use a continuity test
on a multimeter to check for wiring problems CHECK THE CONTACTOR
Toggle E stop Does the E
stop contactor engage when
E stop is released?
TIP The contactors are
noisy when they engage so
you should hear a Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½clunkÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ MEASURE THE RECTIFIER OUTPUT
Is the rectifier outputting the correct DC
voltage?
Yes No
FAULT RELAY
Is there continuity
across the all fault
relays?
TIP Most drives
have LEDs
indicating if the
drive fault relay is
open The DF LED No
YesHARDWARE FAILURE
If the rectifier is not outputting any DC voltage
a hardware failure is the most likely cause
Rectifier or the drive may have shorted out
INCORRECT POWER WIRING
Power down the system and
wait for the reservoir capacitor
on the rectifier to discharge Use
the continuity check feature on a
multimeter to look for blown
fuses and loose or incorrect
wiring YesNo
CONTACTOR POWER
SUPPLY PROBLEM
Check wiring and replace
power supply / step down
transformer if necessary NoCONTACTOR POWER SUPPLY
Check the power supply for the
E stop contactor The power
supply is usually 24VAC provided
by a step down transformer but
varies from system to system Is
the power supply outputting
correctly? IS THE E STOP INPUT WORKING?
When the E stop is pressed does the
software message window indicate that E
stop was detected?
TIP On newer PLCs the E Stop input is
INP11 on older systems the input is INP1
Consult your schematic for more details
TIP On software versions after V8 23
ALT+I on the keyboard can be used to
display the I/O Watch input 11 change from
green to red as the E stop is toggled
Yes INCORRECT E STOP INPUT WIRING
Make sure the correct SIPS are used if
applicable Consult your schematic on
how to wire the E stop input No
No
Yes TROUBLESHOOT ERRORS
Troubleshoot the source of the error
Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ Full Power Without MotionÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½ or Ã�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½Position ErrorÃ�¢Ã¯Â¿Ã‚½ÃƒÃ‚¯Ã‚¿Ã‚½
may indicate a serious hardware failure MEASURE THE RECTIFIER INPUT
Is the rectifier receiving the correct
AC input voltage? No
NoYes INCORRECT POWER WIRING
The problem is most likely a wiring problem or blown fuse Power down the system and wait for the
reservoir capacitor on the rectifier to discharge Use the continuity check feature on a multimeter to look for
blown fuses and loose or incorrect wiring
YesNumbered boxes correspond to the diagram on the previous page #
9 1
2
3 5
6PROBLEMS WITH
CONTACTOR?
Is the contactor
receiving voltage?
usually 24VAC
3
No
Yes 6
BAD CONTACTOR
Contactors can stick and the
solenoids can fail Replace
contactor Yes E STOP INPUT
POWER SUPPLY
The E Stop input
needs to be supplied
with 5 12 or 24 VDC
Is the E supply power
supply outputting
correctly?E STOP INPUT POWER
SUPPLY PROBLEM
Check wiring and replace
power supply / step down
transformer if necessary
No
7 8
INCORRECT WIRING
Use the continuity check
feature on a multimeter to look
for blown fuses and loose or
incorrect wiring VM Troubleshooting Flow Chart