Okuma OSP 5000, Electrical Maintenance, Training Manual

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Okuma America Corporation
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Rev. 8-21-01
The BLD-D type drive amplifier is also composed of four parts: base unit, BDC board, SVC-1
board, and SVCA-2 board. The SVC-1 board has the same LED indicators as the SVC-1 board
on a BDU-D drive amplifier. These LED’s are located on the lower left side of the SVC-1 board.
In addition, the LED’s that are on the SVC-2 board on the BDU-D drive amplifier are incorpo-
rated into the SVC-1 board of the BLD-D except for the PSON LED which is still on the SVCA-
2 board. The following table describes these LED’s which are located on the lower right side of
the SVC-1 board.
Description of LED’s on right side of the SVC-1 board on a BLD-D type drive amplifier.
There is a characteristics table for the D type servo drives (Servo Characterisitics Table). This
table defines the characteristics of the D type drive amplifier. These characteristics vary from
machine to machine and are dependent on the type or size of motor the drive amp is controlling.
There are four settings that should be looked at when a machine is first installed or a D type
drive amplifier is replaced. These are VLG, VNFB, VCOM and DA zero.
The first adjustment that needs to be made on the BLD-D drive amp when it is first installed in
the field is the DA zero check. With the machine powered up and the axes at a standstill, check
the voltage at check terminal DAC on the SVC # one board. Hook the common lead of the
DVM to the COM check terminal and the positive to the DAC check terminal. Adjust the “DA
Zero” potentiometer until the DVM reads 0.00 volts DC.
Set VNFB and VLG to the value given in the Servo Characterisitics Table.
The next adjustment that should be made is VCOM which needs to be adjusted until the correct
DIFF value (on characteristics table) is seen on the CRT during rapid movement (GOO).
LED Color Description
SAOP.N Yellow Sub Amp Operation-Turns off when machine ready signal is received.
IOCS Red Instantaneous Over Current in the Servo amplifier.
IOCM Red Instantaneous Over Current in the Motor.
VR Red The + or - 15VDC and/or the 5 VDC has dropped below specification.
F.OL Red Fin Over Load-Heatsinks are getting too hot.
M.OL Red Motor Over Load
LV Red Low Voltage
HV Red High voltage was detected. The 300 VDC went above 430 VDC.