Thiele Streamfeeder V-710DM, Manual

Page: 65 / 73

58 V
alue
S
erieS
V-710DM M
anual
9
Technical Troubleshooting
Only a qualified technician should perform
electrical troubleshooting activities. This unit
operates on 115V or 230V electrical power.
Bodily contact with these voltages can result in
serious injury or death.
General Troubleshooting
Terms
Gaining Access to
the Internal Electrical
Components
Machine Operation
Overview
Refer to the Model V-710DM electrical wiring diagram located in
Section 8, Electrical Components. Also refer to the interior features
diagram in Section 7, Mechanical Components. Access to the elec-
trical components is gained by removing the two screws securing
the rear section of the shell to the forward section. These screws are
located on each side of the machine near the label that states: “No
serviceable parts inside. Refer servicing to qualified service person -
nel.” Open the split-shell design by tipping the rear shell section back
to expose the internal contents. It may also be desirable to completely
remove the rear section of the shell. Remove the two screws securing
the hinge to the base plate, leaving the hinge secured to the rear sec-
tion of the shell.
In the test sections that follow, Streamfeeder OEM part numbers are
shown in parentheses.
This machine utilizes an SCR motor drive board to run a DC motor.
The board has an inhibit control pin that disables the drive and causes
the motor to stop when the control pin is asserted. This machine also
employs a dynamic braking resistor that is connected across the motor
wires at the same time the inhibit control pin is asserted. This applica-
tion reduces motor coasting, so that the feed belts stop sooner than
otherwise would be possible. All this control logic is provided by the
combination of an AC diffuse reflective sensor operating in the dark-
on mode, and a DPDT mechanical relay with an AC coil. When the
sensor detects an object, it’s output turns off, the relay coil de-ener-
gizes, and the motor stops. When the sensor is not sensing an object,
its output is on, the relay coil is energized, and the motor runs .