PLS-601 User's Manual
Document #11696 Page - 4
3.0 PLS-601 SYSTEM COMPONENTS
The PLS-601 is a state-of-the-art, microprocessor based programmable limit switch that allows a
user to easily program single or multiple LOBES for a maximum of 16 independent circuits
(CHANNELS). In addition, the PLS-601 provides the user with TACHOMETER and MOTION
DETECT functions.
The PLS-601 consists of four standard components. These components are an ANGULAR
POSITION TRANSDUCER designed to be mounted on the target machine. The CONTROL
UNIT that is normally mounted in a NEMA type enclosure. A PROGRAMMER that provides a
keyboard/display for data entry and inspection. And an INTERFACE CABLE that connects the
TRANSDUCER to the CONTROL UNIT. An optional INTEGRAL RELAY BOARD is available
to handle a variety of external AC or DC loads.
The TRANSDUCER, which utilizes a BRUSHLESS RESOLVER, produces an analog signal
proportional to the angular position of the machine shaft. This signal is sent to the CONTROL
UNIT, where it is converted to digital format and displayed on the PROGRAMMER. During each
machine cycle, the CONTROL UNIT will turn the CHANNEL outputs ON and OFF in
accordance with the user programmed LOBE data. The CHANNEL outputs can be used directly,
or in conjunction with the INTEGRAL SOLID STATE RELAYS.
3.1 TRANSDUCER
The TRANSDUCER is a single-turn rotary position transducer that is used in conjunction with the
Control Unit. The TRANSDUCER utilizes a BRUSHLESS RESOLVER which eliminates the
reliability problems associated with optical encoders or brush-type resolvers. The brushless
resolver is housed in a rugged extruded aluminum enclosure, which is anodized to provide a
durable finish. The enclosure is sealed and gasketed to provide oiltight, dust-tight (NEMA 13)
protection for the internal electrical components.
A 3/4 inch stainless steel input shaft is used to provide a heavy-duty, corrosion resistant
transducer/machine interface. A flexible coupling provides mechanical isolation between the
transducer shaft and the resolver for increased mechanical reliability. Sealed ball bearings are used
to maximize transducer life, performance, and reliability by providing a high quality bearing for
the transducer. The transducer enclosure contains an integral industrial-duty, MS-type connector
for interfacing to the Control Unit.
The TRANSDUCER may be mounted via the standard front face mount, or an optional foot
mount adapter for retrofit applications.
