Technical_reference - 第10页

Technical Service Manual 10 Revision Dat e: August 2004 HEAT CONT ROL O VERVIEW POW ER DISTRIBUTION O VERVIEW 3-phase power supplied to the High Voltage ter mi nals on the electrical panel is distributed to: 1) T he prim…

Technical Service Manual 9 Revision Date: August 2004

A - CONTROL SYSTEM OPERATION

OVEN CONTROL SYSTEM OVERVIEW

For discussion here, the Oven Control System will be divided into five parts:

• Power Distribution Overview

• Computer and Controller Overview

• Conveyor Control Overview

• Fan Control Overview

Technical Service Manual 10 Revision Date: August 2004

HEAT CONTROL OVERVIEW

POWER DISTRIBUTION OVERVIEW

3-phase power supplied to the High Voltage terminals on the electrical panel is distributed to:

1) The primary terminals on the Control Transformer (T1), the secondary side of T1 is connected to the line side

of the E-stop relay (K37). T1 provides 120VAC for ALL control functions throughout the oven.

2) The line terminals of the Heater Contactor (K2)

3) To either the line terminals of the Fan Contactor (K3), or

the primary side of the INVERTER (if the oven has

the Nitrogen Option) or three phase Fan transformer if the three phase supply voltage is higher than 240

volts.

CAUTION:

WHEN THE OVEN IS “OFF”, MANY PARTS OF THE OVEN

MAY BE ELECTRICALLY POWERED AND DANGEROUS

Technical Service Manual 11 Revision Date: August 2004

COMPUTER AND CONTROLLER OVERVIEW

Control of the oven is accomplished by:

1. An IBM ™

compatible COMPUTER runs the Oven Control Program. The computer has a serial communication link

with the CONTROLLER on the electrical panel.

2. The CONTROLLER interprets the Computer’s requests to energize, de-energize, or modulate devices or sub-

systems within the oven, then receives or sends the necessary signals. If the required signal (in or out) is 5VDC or

less, it is handled directly by the CONTROLLER. If a 120VAC output signal is needed, the CONTROLLER

communicates with the INPUT / OUTPUT BOARD. The I/O board relays will switch the necessary power for

operation.