Figure 31, Figure 32 – Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) User Manual
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Rockwell Automation Publication 7760-UM001D-EN-P - October 2014
Chapter 2
Commissioning Procedure
Figure 31 - Gate Pulse Detail – Typical SCR (ABB)
Figure 32 - Gate Pulse Test Waveform
19.
If no pulse is observed, and the yellow LED is lit, check for a shorted gate
on the SCR by removing the green plug and connecting an ohm-meter to
the gate leads. If the LED is still not lit, and the circuit voltage is as
specified in step 18 (above), pinch the tab on the blue fire-optic connector
and carefully pull it straight out of the receiver. The end of the connector
should glow red to indicate the presence of a gate signal. If it does not,
remove the other end of the cable from the interface or Fibre Optic board
and check that the grey transmitter is emitting red light. If it is, the fibre
optic cable must be replaced. If it is not, the interface board should be
replaced or Fibre Optic board should be replaced.
IMPORTANT
The fibre optic system used in this equipment utilizes LED transmitters
classified as IEC 60825-1 AEL Class 1, which are considered eye safe. However,
the light is concentrated in the fibre, and it is recommended that users not look
directly into the fibre and connectors. Directing the light to a fingertip or
another object is sufficient to determine correct performance.
Microseconds
Vo
lts