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CS4000 Mini Controller with Ethernet
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3-10
T-38324-A 39-30-38324
Servo Amplifier
The servo amplifier is a three-phase, brushless DC motor controller that provides electrical power to
the nutrunner motor. It receives control signals from the Device Control Module (DCM). Based on the
state of these inputs, the servo amplifier energizes the motor windings to rotate the motor.
The servo amplifier serves as a closed-loop speed controller. It modulates the motor winding currents
in order to maintain a constant motor speed despite changes in load. Additionally, the servo amplifier
can stop the motor quickly by way of dynamic braking. The servo amplifier boards are paired with the
DCM board and are housed inside the TCM.
A 20A, 250V servo amplifier fuse (part number 13-10-0700) is located on the first servo amplifier
board.
Device Control Module
The Device Control Module (DCM) is an electronic circuit board that contains powerful 80186EA
processor. It is paired with the servo amplifier inside the TCM. The DCM is the brain of the CS4000
Controller with Ethernet. It receives signals from the nutrunner control switches, the set point inputs,
the nutrunner torque sensor, and remote control inputs and generates the appropriate outputs to the
servo amplifier control inputs, the status output relays, and the nutrunner status LEDs. The DCM has
plug-in electrical connections. It is easy to remove and replace.
A 3V lithium battery is located on the DCM board. You must remove the DCM board from the TCM
in order to replace this battery. A generic 3V lithium battery (Duracell DL 2450, Sanyo
CR 2450, or similar) can be used.
Figure 3-7. DCM Board and DCM Battery Location
3V Lithium Battery
+ side up