SIMPLEST ELECTRONIC CAM SWITCH

Easy-to-Understand Thumbwheel Programming 
The M1750 PLS combines the ease of thumbwheel programming with the convenience of an integrated limit switch. The thumbwheel programming is designed to duplicate the mental process used in setting-up an electromechanical cam switch and thus permits an easy to understand operation. Just like a rotary cam switch, the M1750 PLS can be programmed through zero, e.g., ON at 350° and OFF at 10°.

Operation at 1800 RPM, Programmable in Motion The high speed ratiometric tracking converter guarantees perfect machine operation at speeds of up to 1800 RPM. All the program variables are immediately active in the process, as entered by the user. This feature permits fine-tuning with the machine in full motion.

Entire Program Visible at a Glance
The thumbwheel programmed ON and OFF setpoints for all channels are visible at a glance, which permits simple operator­to-machine interface.

Absolute Position, Up to 0.36° Resolution
The M1750 PLS operates with a resolver or an absolute digital encoder as position transducer, giving an absolute shaft position in both cases. This means that the system always keeps track of the true position, even upon machine movements after power outage. The resolver-to-digital decoder source modules are available with 360 or 1000 counts-per-revolution to achieve a resolution of 1° or 0.36°.

ULTIMATE IN RELIABILITY, SERVICEABILITY

Thumbwheels Provide Mechanical Memory
Even with all the advancements in technology, there is no substitute for reliability of mechanical memory provided by thumbwheels. The thumbwheel program memory does not require any battery back-up, nor is it affected by electrical noise or use over an extended period of time.

Thumbwheel mechanical memory is not affected by external electrical interference.

Short-Circuit-Proof Resolver-PLS Connection

The electrical interface circuit connecting the resolver and the M1750 PLS protects against accidental shorts in the resolver/PLS wiring.

RUGGED RESOLVER

Reliable Under Extreme Environments
The M1750 PLS combines the ruggedness of a brushless resolver and the reliability of an advanced solid-state control. The rugged, heavy-duty, NEMA 13 (IP54) resolver can be mounted on a machine shaft in any hostile environment, such as mechanical shock, vibration, extreme humidity and temperature changes, oil mists, coolants, solvents, etc. The programmable control unit M1750 can be mounted up to 2500 ft. away in a control panel. The ratiometric converter assures high-tracking-speed of 1800 RPM and high-noise-immunity.

MODULAR CONSTRUCTION

The entire logic is built on modules, which are independent of each other. In case of a problem, just plug-in a new module. The modules increase design flexibility to match the system to your application.

SOURCE MODULES

Resolver or Encoder Input
A standard source module with built in Resolver-to­Digital converter, offset and digital display accepts resolver input and transforms the resolver signal to digital format for further processing in the comparator circuit. A digital display source module interfaces to an absolute BCD encoder and feeds this information to the comparator circuit.

For time-base-generator input consult the factory.

Full-Revolution Digital Off-set
A full-revolution thumbwheel or external offset is provided on decoder source modules and permits easy alignment of machine zero with resolver zero to compensate for any mechanical misalignments, machine wear or speed variations. To fine-tune the machine operation for maximum precision, the offset can be adjusted with machine in full motion. The external offset entry from a programmable controller is especially useful for continuous compensation of speed changes.

Program Control from External Programmable Controller
When using resolver as input device, a special-purpose, external-offset resolver decoder module accepts BCD offset signal from a programmable controller to compensate continuously for any speed changes. The BCD position data from the decoder module or from the encoder terminals is also available for external devices such as programmable controllers or remote readouts.