Electrical And Mechanical Control Systems; Intellitec Controller; Contactors - Stoelting F431 Service Manual

ELECTRICAL AND MECHANICAL CONTROL SYSTEMS

The wiring diagram is available in Section 8.
6.1

INTELLITEC CONTROLLER

The IntelliTec control is Stoelting's most advanced con-
troller. It combines all of the best features of previous
controllers with advanced sensing and troubleshooting
capabilities.
Understanding the modes of operation and individual con-
trol settings will make servicing the control straightforward.
A. COMPONENTS OF CONTROLLER
The IntelliTec control consists of three main components;
the control board (Figure 6-1), the membrane switch
(Figure 6-2), and the display panel module (Figure 6-3).
The membrane switch is connected to the display panel
module via a 9-pin ribbon cable. The display panel mod-
ule is connected to the IntelliTec control board through a
telephone cord. The IntelliTec control board is connected
to the machine through an 8-pin connector, a 7-pin con-
nector, and a 6-pin connector.
The left side membrane switch (touchpad) controls the left
side of the machine and the right side membrane switch
controls the right side. The IntelliTec control boards are
mounted in the same respect; the left control board runs
the left side and the right control board runs the right side.
Figure 6-1 IntelliTec Control Board
NOTE
SECTION 6
Figure 6-2 Membrane Switch
6.2

CONTACTORS

The compressor and drive motor contactors are mounted
inside the electrical box behind the header panel. There
is one contactor for the compressor and a contactor for
each drive motor.
The IntelliTec control sends electronic signals to trigger
the contactors. Separate signals are used to control each
drive motor contactor and the compressor contactor. The
signals to the contactors are staggered, so the drive mo-
tor will always start and stop three seconds before the
compressor. By staggering the starting and stopping of
the drive motor, maximum starting torque is available and
voltage spikes are reduced.
Figure 6-3 Display Panel Module
45