1-10 General Information
MN1269
General Description
A typical Baldor “LD” Servo Control like that shown in Figure 1-3 can contain from 1 to 4
servo control cards and a chassis assembly. The chassis assembly includes a Logic
Power Supply, Bus Power Supply, Overvoltage Protector, Fans and miscellaneous
hardware.
Servo Control Card
The servo control card is a circuit board, which translates bus voltage and velocity
information into an output for the servomotor with a defined velocity and direction.
Chassis Assembly
The chassis assembly provides the mounting plate for the servo control cards as well as
the power supplies.
Logic Power Supply
The logic power supply converts the 115 VAC input to a
±
15 VDC for operating the servo
control electronics and provides a fused ground fault protection circuit. Four green status
LED’s are also provided to verify the presence of +15 VDC (PV), –15 VDC (MV), AC for
fans and logic (AC), and DC Bus voltage (PB or BUS).
Bus Power Supply
The bus power supply converts the 115 VAC input voltage into a DC voltage, which is
controlled within the servo control to power the servomotor.
Overvoltage Protector
The standard configuration contains an overvoltage protector, which dissipates (shunts)
excess bus voltage developed during rapid deceleration to prevent damage to the servo
control. The overvoltage protector is fused to protect against catastrophic conditions.
Adjustments, Testpoints, and Indicators
The servo control card contains six set–up adjustments and four (4) red fault indicators
for flexibility and troubleshooting (see Figure 1-4.) The logic power supply has four green
status indicators which when lit show the presence of AC and DC power to the chassis.
Figure 1-3 Example of a LD2–02S
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ, 07045-0097
(973) 335-1007 • Toll Free: (800) 922-1103 • Fax: (973) 335-1661
www.servosystems.com
