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Servo Amp

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AU6351N60 TAMAGAWA SEIKI CONTROLLER SERVO AMP    US $2,599.20

NEW FANUC SERVO AMP A06B 6124 H206    US $2,500.00

Pacific Scientific SC904 001 01 Servo Drive 30 Amp Used Working AMAT XR80    US $2,301.12

RECONDITIONED FANUC SERVO AMP A06B 6058 H203    US $2,250.00

Miller Daihen OTC C2 Robot Servo 30 Amp FD310 P301    US $1,900.00

Miller Daihen OTC C2 Robot Servo 15 Amp FD310 P151    US $1,900.00

RECONDITIONED FANUC SERVO AMP A06B 6058 H226    US $1,750.00

RECONDITIONED FANUC SERVO AMP MODULE A06B 6117 H104    US $1,600.00

RECONDITIONED FANUC SERVO AMP A06B 6058 H225    US $1,500.00

Nachi Servo Amp Board UM120 36303    US $1,495.00

FANUC Servo Amp A06B 6079 H101    US $1,250.00

RECONDITIONED FANUC SERVO AMP A06B 6058 H222    US $1,250.00

RECONDITIONED FANUC SERVO AMP A06B 6057 H006    US $1,250.00

FANUC SERVO AMP A06B 6047 H041 WITH TOP BOARD    US $1,150.00

NICE RECONDITIONED FANUC SERVO AMP A06B 6079 H106    US $1,150.00

RECONDITIONED FANUC SERVO AMP A06B 6066 H006    US $1,100.00

RECONDITIONED FANUC SERVO AMP A06B 6079 H106    US $1,100.00

RECONDITIONED FANUC SERVO AMP A06B 6079 H105    US $1,100.00

KLA Tencor X Y Stage Servo AMP P N 022456 000    US $1,050.00

Fanuc Servo Amp A74L 0001 0050    US $1,000.00

RECONDITIONED FANUC SERVO AMP A06B 6066 H235    US $1,000.00

RECONDITIONED FANUC SERVO AMP A06B 6057 H007    US $1,000.00

3 Axis Esab CNC GMA Servo Amps 41    US $1,000.00

AMAT DRVR SERVO AMP 30A 200 230V DNET 1080 00082    US $971.90

FANUC AC SERVOAMPAMPLIFIER A06B 6077 H111 AWESOME    US $900.00

Okuma LDU 600 DC Servo Drive 50 Amp    US $750.00

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Assuming that you are not removing the SCR from the circuit.
Try to look at the gate signal and the output at the cathode on a double beam 'scope while the servo is trying to operate. Or disconnect the gate and try to turn the SCR on from an external source and see if you get output motion from the servo or whatever the output is.Some caution required with 440 v !!Some recollection from 25 yrs ago may help ? Making a bridge or H-switch to drive a 1/2 hp dc motor. Collected a pile of dud transistors on bench until able to prevent simultaneous turn-on down one side of the bridge. This is prevented by correct commutation and ensuring that during switching, the instantaneous power dissipation in the device remains outside the specified region.Commutation is aided by placing an air-core inductor in series with the load and then usng a secondary winding on this to make sure that when one side is conducting that the other arms are turned off.It is somewhat tricky and very critical.

Samco current limiting servo amp - first test