Ross TC700M, Operator'S Manual, Page: 9 / 44

disconnect switch (S1) to the line terminals L1, L2 and L3 of the motor starter (K1) and to terminals 3, 4,
and 5 of the phase sensor.
A single-phase connection from the incoming power is applied to the primary of the control transformer
(T1) through fuses F2 and F3. The control transformer is designed with tapped primary and secondary
windings allowing it to be connected such that a control voltage of approximately 120 VAC may be
obtained from a wide range of line voltages. The 120 VAC control voltage is used to energize the coils of
the motor starter (K1) and relay (K2) as well as the head adjusting motor circuit.
Power from the secondary of the control transformer is fed through the POWER switch (S2) to fuses F4
and F5. The load side of fuse F5 is connected to terminals 1 and 8 of relay K2 and to one side of the
START switch (S3). With the machine connected to the proper electrical power source, the disconnect
switch turned on and the POWER switch pulled out, pressing the START switch will energize relay K2
through guard switch S7 providing the guard is closed. When K2 pulls in, contacts 8 – 6 of K2 feed 120
volts to one end of the motor starter’s coil (K1) and contacts 1 - 3 latch K2 in allowing the START switch
(S3) to be released. S8 is an E-stop switch mounted at the rear of the machine.
Although the vertical reciprocating motion of the Tenderizer head is unaffected by the rotational direction
of the main drive motor, if the motor was to operate in the reverse direction, the drive to the conveyor
would occur with the blades partially down. Under these conditions, the conveyor would attempt to move
with the blades still inserted in the product. To prevent this from happening, a phase sensor (A1) is
incorporated in the electrical system to keep the motor starter from being energized unless the incoming
power is correctly phased.
Terminals 3, 4, and 5 of the phase sensor are connected to the incoming power allowing the phase
sequence to be sensed. If they are in the correct sequence, an internal solid state relay connects
together terminals 1 and 8 of the phase sensor. Terminals 1 and 8 are connected in series between the
return side of the motor starter’s coil and the 0 volt connection fromT1, thus with the proper power
phasing, the motor starter will pull in applying the three phase power to the main motor and the machine
starts operating.
120 volts from the transformer through the POWER switch and fuse F4 is applied to the bridge rectifier
(CR1). The DC terminals of CR1 are connected to the head adjusting motor through the HEAD
ADJUSTING switch (S4) and limit switches (S5 and S6). S4 is a two position switch with four contact
blocks connected so as to allow reversal of the polarity of the DC voltage that is applied to the head
adjusting motor (M2) through terminals 4, 5 and 6. One side of M2 is connected to terminal 4 while the
other side of the motor is connected through the limit switches (S5 and S6) to terminals 5 and 6. The
HEAD ADJUSTING switch has no ‘off’ position, when either the HIGH or STD positions are selected, the
motor will operate until the head assembly reaches the selected position and the appropriate limit switch
opens.
Once started, the tenderizer will continue to operate until either the disconnect switch is turned off, the
POWER switch is pushed in or one of the guards is opened. Restoring any of these devices will NOT
allow the machine to start, the START switch must be pressed.
MN700-MC0010
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