Docu-No.: 1090020601-EN Rev. 1.2.1
Page 85
Troubleshooting 10
KCM Drive and Power Supply Details 10.3
10.3.2
KCM Drive pc board LEDs-all types
Note:
• Power supplies mounted on the drive pc board surface may also
have LEDs indicating operation. If Off, check line power.
LED
Function
Notes
Alive
CPU is operational
If not flashing, Drive has failed or has no AC line power
TxD
Transmit data on the
internal channel
Data is being sent to the KCM CPU pc board on the
Internal data channel. CPU is the channel master.
RxD
Receive data on the internal
channel
Data is being received from the KCM CPU pc board on the
Internal data channel. CPU is the channel master.
Alarm
Alarm function
Drive pc board has an alarm condition. Marked as <Error>
on the AC interface pc board.
Power
Shows power at drive
Only on the Vibratory drive.
Fig. 10.3
Speed pick-up adjustment
10.3.3
Measuring motor power
Connect an external current/power measuring device only to the AC
current input of the KCM, as the control of the motor takes place via
pulse width modulation and the current to the motor cannot be mea-
sured using conventional instruments.
10.3.4
Measure and adjust speed frequency signal
The speed signal is a square-wave signal from 0 to 10.8 kHz/5 V DC.
The signal can be measured at the following locations:
• At the feeder: connect oscilloscope between common and signal.
• At the KCM: connect oscilloscope between J2-4 (COM) and J2-2-
(signal).
Notes
:
• If a scale interface pcb is used, connect to LK4-42 for common and
check the signal at LK-4 pins 47 and 48 for complementary
frequency signals. Amplitude of the waveform will be about 3.5 vdc.
• The gap between the pick-up gear and the face of the pick-up is
critical to feeder operation. If the gap is too large the waveform and
frequency from the sensor will not be correct. If the gap is too close,
pick-up damage will result. A piece of paper is a practical gapping
tool.
• Set pick-up and check the gap and the waveform.
• Normally the speed pick-up is located near the motor shaft of the
feeder drive motor.
+ 5 Vdc
Com
Red
Blue
Yellow
Speed
Pick-up
0.125 mm
0.005 inch
