Comet Executive Gas Operating Principles
5-11
5.5 Sequence of Operation
The unit has four main stages of operation:
• Stand-By Stage
• JOG REVERSE Operation Stage
• Mechanical Start-Up Stage
• Burner Operation 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 eciently.
NOTE: The letters and
numbers in parentheses are
schematic references. For
more information, refer to the
SCHEMATIC PARTS LIST.
Stand-By Stage
During this stage, the main disconnect switch
is ON, but the unit is not operating.
1. Line voltage is present at INV1.
2. One stage of the incoming power supplies
the transformer T1, converting the line
voltage to 24 VAC. The 24 VAC supply is
terminated at the START button and the
CR1 contacts.
3. Power is connected to the exhaust blower
motor. The exhaust blower motor rotates
the exhaust blower fan and moves air
through the discharge duct.
JOG REVERSE Operation Stage
When the ironer is in Stand-By Stage, the JOG
REVERSE button is active.
1. When the button is pushed, it closes the
inverter’s reverse motion circuit, causing
the main drive motor to run in reverse.
2. When the button is released, the circuit is
opened and the motor stops.
3. The setting of the speed control is active.
The control should always be set to mini-
mum before using the JOG REVERSE
button.
4. When the ironer is running normally,
pressing the JOG REVERSE button will
have no eect on machine operation.
To Next Page
Loading...