Operating Principles GL16
5-14
5.5 Sequence of Operation
The unit has four main stages of operation:
• Stand-By Stage
• Mechanical Start-Up Stage
• Heating System Normal Operation Stage
• Heating System Fail-Safe Protection
Stage
Each stage requires several components to
accomplish its job. The sequencing and timing of
stages are critical.
The following steps describe the logical
progression of events allowing the unit to work
safely and efficiently.
NOTE: The letters and numbers
in parentheses are schematic
references. For more information
within this manual, proceed to the
SCHEMATICS section.
Stand-By Stage
During this stage, the incoming power is
connected to the unit, but the unit is not operating.
The JOG switch is energized and functional,
allowing operators to clear jams without
completely starting the unit.
1. One stage of the incoming power line sup-
plies the transformer T1, converting the
line voltage to 24 VAC. The 24 VAC sup-
ply is terminated at contactor CON2 and
the START button contactor. Both
contactors are normally open.
2. When contactor CON2 closes, the in-
verter (INV1) makes power available to
the main drive motor (MTR1).
Mechanical Start-Up Stage
This stage contains the sequence that occurs
when the unit begins operating without ignition of
the burner.
1. The green START button is pressed, the
24 VAC supply energizes contactor
CON2, and the green START button in-
dicator lamp comes on.
2. The auxiliary contacts close, allowing the
green START button to release without
de-energizing the start relay.
3. The Cylinder Motion Interlock Relay
(CMI) in the right end frame has a 5-sec-
ond delay, allowing the unit to start and
come up to speed.
• If the sprocket sensor (PX1) is not trig-
gered by rotation of the main drive, the
CMI relay contacts open and the start
circuit is disabled.
4. The three START power contacts close
and initiate the following events.
• The normally-closed auxiliary contact
in the AC frequency inverter motor
control circuitry opens and disables op-
eration of the JOG switch.
• Simultaneously, a second contact in the
motor control circuitry closes, signal-
ing the control to provide power to the
main drive motor.
• The ironing cylinder, feed ribbons, and
return ribbons begin to rotate.
• On Type F units, the delivery ribbons
also begin to rotate.
• On Type R units, power is connected
to the rear delivery motor (MTR4).
• On Type R units, the DELIVERY le-
ver must be set to FRONT or REAR
for the delivery ribbons to rotate.
To Next Page
Loading...
General