Curtis 1220 Manual, Rev. C
1
OVERVIEW
e Curtis Model 1220 controller is designed to drive a brushed permanent
magnet motor for electric power steering (EPS). e 1220 performs as the
steering system controller, interpreting the steering command input and wheel
position feedback, then driving the steering motor to move the steered wheel(s)
to the desired position.
e steering motor must be speed reduced to get the high torque required
to rotate the drive wheel. Typically this is done with a gearbox around 50:1
and a chain or gear with an additional reduction of around 4:1. e steering
command comes either from a linear potentiometer or an analog voltage sen-
sor. e wheel position feedback comes either from a linear potentiometer, an
analog voltage sensor, or an encoder with a home switch.
1
1 — OVERVIEW
Fig. 1 Curtis 1220 electric
steering controller.
e 1220 works only with Curtis AC traction controllers with embed-
ded VCL. A “handshake” with the traction controller is required at startup to
enable operation.
Intended applications are material handling vehicles such as reach trucks,
order pickers, stackers, “man up” warehouse trucks, and other similar industrial
vehicles.
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