Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control User Manual

Page 391

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Component Definition and Maintenance 6-47

7000 “C” Frame

7000L-UM300I-EN-P – June 2013

Test points description

TP1 – SCR gate output (attach oscilloscope between TP1 and TP2

to see gating pulses)

TP2 – SCR cathode output

TP3 – Common reference point for all other test point measurements,

except for TP1, which uses TP2 as its reference point

TP4 – The positive 20 V rail used for the SPGDB operation

TP5 – The positive 5 V rail used for the SPGDB operation

TP6 – The sense voltage taken from the sense resistor across the

SCR being controlled

TP7 – Trigger signal, which remains active for a fixed period of

time after the SCR being controlled, has turned on and the
voltage across it has collapsed

TP8 – Internal gating signal that indirectly turns on the SCR that is

being controlled

TP9 – Gating signal received from the commanding drive control

board, through the appropriate fiber optic cable

The yellow LED (LED 1) on the SGPDB indicates that the SCR
being controlled has a gating current flowing which is used to turn
the SCR on.

Test power connection

Fiber optic transmitter

and receiver

Thermal sensing

connection

TP9

TP8

TP7

TP6

TP3

TP4

TP5

Gate and cathode
thyristor connection

LED

Snubber connection

TP1

TP2