Rockford Systems, LLC
22
Call: 1-800-922-7533
SSC-1500 Part Revolution Solid-State Control
Resolver/Pulser Assembly
The absolute resolver/pulser assembly with spring-tension base is used to provide position and
velocity/motion information of the machine crankshaft to the control. The resolver is a highly
accurate and repeatable timing device. The resolver/pulser is contained in a rugged, heavy-
duty housing with a spring-tension base. The 3/4” diameter steel shaft is mounted in sealed ball
bearings. This results in a rugged transducer assembly for press applications. The resolver/pulser is
furnished with a 40’ cable that attaches to the drive assembly and wires in to the control box. When
installing, the cable can be cut to the exact length required (do not splice). For more than 40’ of
cable, please contact factory. See the enclosed wiring schematics for proper wiring.
Do not run cable in conduit or in bundles with
higher voltages that may cause electrical interference.
The photo-electric pulser is monitored by the control logic to verify
proper resolver position. Position changes can occur either mechanically
or electrically. A mechanical failure can result if the resolver slips, and
an electrical failure can result within the resolver cabling or circuitry. If
failure occurs, the resolver position and the pulser cam signal will not
match and the circuit logic will detect the fault. The pulser cam and
resolver are connected internally to the connector provided; therefore, no
wiring is necessary. The resolver/pulser is factory arranged for clockwise
(CW) rotation (when facing the end of the shaft). A wiring change is
required for counterclockwise (CCW) rotation. See sheet no. 2 of the
enclosed wiring schematics for further details.
After installation of the resolver/pulser and wiring is complete with the
machine at TDC (top dead center), perform the power-up procedure
in section 4 on page 40. This will automatically detect the pulser cam
and set up the resolver for normal operation.
When installing a chain and sprocket or drive coupling to the 3/4” shaft,
start with the machine at TDC (top dead center) and the keyway pointing
up, perpendicular to the base (Photo 3.13). Connect the chain to sprockets
or tighten the drive coupling. (See next page for sprocket and chain drive).
Note: If the resolver assembly is mounted on an angle or even
upside down from what is illustrated, be sure keyway on shaft
is always perpendicular to the base. The keyway must always
be turned 180° away from the base when initially setting up
the machine. The crankshaft of the machine must be at TDC.
Refer to the wiring section on page 37 or to the electrical schematic
prints that came with the control box for proper wiring connection of
the resolver assembly.
SECTION 3—INSTALLATION OF COMPONENTS
Photo 3.17
Part CMS-112 Resolver/Pulser Assembly
Cable
Keyway
Cable
Connector
Pulser
Spring/Adjustment Jam Nut
Spring-Loaded Base
3/4” Shaft
3
⁄
16
”
Keyway
Resolver
Photo 3.19
Resolver with Keyway in Correct Position
Photo 3.18
Resolver/Pulser Assembly
(Top of cover has been removed for photo)
(Continued on next page.)
