HMI & peripherals
Contactor
Switches main power to the servo drive system on and off under control of the safety and control circuits.
The motor contactor is a relay-like switch sized for the servo system's full current draw, controlled by the safety and control circuits to connect or disconnect drive power, most importantly dropping out immediately when an e-stop is triggered.
Because it switches significant current repeatedly over the life of the robot, contactor contacts erode gradually, and a contactor near end of life may show visible pitting or discoloration on inspection.
Welded contacts are the more serious failure mode for this part, since a contactor stuck closed can defeat the purpose of an e-stop circuit that depends on it opening reliably.
Related components
Common questions
- What does the Contactor do?
- Switches main power to the servo drive system on and off under control of the safety and control circuits.
- How does the Contactor fail?
- Common failure modes: Contact erosion from repeated switching over service life, Welded contacts preventing reliable power disconnect, Coil failure preventing the contactor from energizing, Chattering from a marginal control voltage supply.
- What fault codes relate to the Contactor?
- Related codes include SRVO-001, SRVO-023.