Despatch RBC1-50 Installation Manual

C-200

RBC1

RBC1----50

RBC1RBC1
INSTRUCTION MANUAL

INSTRUCTION MANUAL

INSTRUCTION MANUALINSTRUCTION MANUAL

50

5050

PN 163189
REVISION B

1/2003

Notice

Users of this equipment must comply with operating procedures and training of operation
personnel as required by the Occupational Safety and Health Act (OSHA) of 1970,
Section 6 and relevant safety standards, as well as other safety rules and regulations of
state and local governments. Refer to the relevant safety standards in OSHA and
National Fire Protection Association (NFPA), section 86 of 1990.

Caution

Setup and maintenance of the equipment should be performed by qualified personnel who
are experienced in handling all facets of this type of system. Improper setup and
operation of this equipment could cause an explosion that may result in equipment
damage, personal injury or possible death.

Dear Customer,
Thank you for choosing Despatch Industries. We appreciate

the opportunity to work with you and to meet your heat
processing needs. We believe that you have selected the
finest equipment available in the heat processing industry.

At Despatch, our service does not end after the purchase
and delivery of our equipment. For this reason we have
created the Service Products Division within Despatch. The
Service Products Division features our Response Center for
customer service. The Response Center will direct and track
your service call to ensure satisfaction.

Whenever you need service or replacement parts, contact
the Response Center at 1-800-473-7373: FAX 612-781-

5353.
Thank you for choosing Despatch.

Sincerely,
Despatch Industries

PREFACE

This manual is your guide to the Despatch oven. It is organized to give you the
information you need quickly and easily.

The INTRODUCTION section provides an overview of
the Despatch oven.

The THEORY OF OPERATION section details the
function and operation of assemblies and
subassemblies on the Despatch oven.

The INSTRUCTIONS section provides directions on
unpacking, installing, operating and maintaining the
Despatch oven.

The APPENDIX section contains special instructions
on air atmosphere and nitrogen atmosphere Burn-In
ovens, a Troubleshooting Table, a list of Accessories
and a Warranty.

Refer to the manufacturer’s manual for instructions on the use of the controls.
The parts are listed in the corner of the prints, the electrical items on the electrical print

and the mechanical items on the mechanical prints.
An efficient way to learn about the oven would be to read the manual while working with

the corresponding oven control system. This will give you practical hands-on
experience with information in the manual and the oven.

Before operating the equipment, be sure you understand all of the technical information
contained in this manual. Information skipped, not understood or misunderstood could
create the possibility of operating the equipment in an unsafe manner. This can cause
damage to the oven or personnel or reduce the efficiency of the equipment.

NOTE:
Read the entire
INTRODUCTION and THEORY
OF OPERATION before
installing the oven.

WARNING:
Failure to heed warnings in this
instruction manual and on the
oven could result in personal
injury, property damage or
death.

1

TABLE OF CONTENTS

PREFACE.......................................................................................................................1

INTRODUCTION.............................................................................................................4

Special Features..........................................................................................................4

Specifications ..............................................................................................................5

Dimensions ..............................................................................................................5

Capacities ................................................................................................................5

Temperature ............................................................................................................6

Power.......................................................................................................................7

Power Requirements............................................................................................7

THEORY OF OPERATION .............................................................................................8

Temperature Control....................................................................................................8

Power Switch...............................................................................................................9

Air Circulation ..............................................................................................................9

Chamber Design..........................................................................................................9

Airflow Switch ..............................................................................................................9

Alarm...........................................................................................................................9

Chamber Door Handle...............................................................................................10

Damper Control ......................................................................................................... 10

Determining Damper Settings................................................................................10

Full Closed Position............................................................................................10

Full Open Position.............................................................................................. 11

Minimum Opening for Dissipation of Live Load ..................................................11

Other Damper Settings.......................................................................................11

OVEN INSTRUCTIONS................................................................................................13

Unpacking and Inspection .........................................................................................13

Warning Signs Missing..............................................................................................14

Set-up........................................................................................................................15

Power Connection ..................................................................................................... 16

Operating...................................................................................................................17

Loading the Oven...................................................................................................17

Oven Temperature Limit ........................................................................................18

Product Temperature Limit.....................................................................................18

Operator Training Requirements............................................................................18

Pre-Startup Checklist.............................................................................................19

Startup ...................................................................................................................19

Maintenance..............................................................................................................21

Checklist ................................................................................................................21

Inspection and Cleaning.........................................................................................22

Vents..................................................................................................................22

Chamber.............................................................................................................22

Control Cabinet and Fan ....................................................................................22

Chamber Door Gasket........................................................................................23

Recirculation Motor.............................................................................................23

Oven Exterior......................................................................................................23

Oven Chamber Interior.......................................................................................23

Door Hinges and Latches...................................................................................23

2

Automatic Damper..............................................................................................24

Controls and Indicators.......................................................................................24

Loose Screws, Bolts and Fasteners ...................................................................24

Lubrication..........................................................................................................24

Tests...................................................................................................................... 25

OPTIONAL ACCESSORIES .........................................................................................26

Door Switch ............................................................................................................... 26

Recorder....................................................................................................................26

Redundant High-Limit................................................................................................26

Disconnect Switch ..................................................................................................... 27

Stacking Option ......................................................................................................... 27

Replacement .............................................................................................................28

Parts.......................................................................................................................28

Nitrogen and Liquid Nitrogen.....................................................................................28

Theory of Operation...............................................................................................28

Operator Training Requirements............................................................................29

Operation...................................................................................................................29

Nitrogen Atmosphere.................................................................................................31

Purge Rate.............................................................................................................31

Maintain Rate.........................................................................................................32

Troubleshooting.........................................................................................................33

Circuit Board Check...............................................................................................35

3

INTRODUCTION

This instruction manual covers the operation and
maintenance of the Despatch RBC1-50 Burn-In
oven.

NOTE:
Read the entire
INTRODUCTION and THEORY
OF OPERATION before
installing the oven.

Special Features

The sturdy construction and three-inch insulation top and bottom and four-inches of
insulation on the sides of the Despatch RBC1-50 Burn-In ovens contribute to excellent
temperature uniformity.

Other special features include the following:

• Unique Despatch design to combine higher fan volume of forced recirculated air
with a system of perforated stainless steel walls for the ultimate in temperature
uniformity.

• Welded double wall construction and fiberglass insulation to reduce heat loss.
Silicone rubber gaskets further minimize heat leakage.

• Rapid response heater.

• Scratch-resistant baked enamel exterior and stainless steel interior for easy

cleaning.

4

Specifications

Dimensions

Model Chamber Size

in (cm)

W D H W D H
RBC1-50 18

(46)

25

(64)

(46)

Capacities

Maximum Load 150 Lbs
Fresh Air/ Exhaust Capacity at

125 °C (255 °F)
Recirculating Fan 600 CFM 1 HP

Capacity

feet3

(liters)

18

4.7

(133)

RBC1-50

Air Atmosphere

51 CFM N/A

Overall Size

in (cm)

46

(117)

36

(91)

MODEL

RBC1-50

Nitrogen Atmosphere

31.50
(80)

Fresh Air Inlet 2.5” Diameter N/A
Exhaust outlet 2.18” Diameter N/A
# of Doors 1
Approximate Weight 470 Lbs. (213 KG)

5

Temperature

RBC1-50

Time to Temperature 25°C - 80°C
(approximate minutes with 25°C - 125°C
no live load)
25°C - 260°C

Recovery Time to 125°C with door open 1 Min.
Temperature Uniformity at

260°C*
Operating Temperature Range

(Based on 25°C ambient, and dampers fully open)

(1)

25°C - 150°C

(2)

125°C*

RBC1-50

Air Atmosphere

4
10
14
34

>1 Min. >1 Min.

<±1°C

±1°C

50° - 260°C 15° - 260°C

Nitrogen Atmosphere

4
10
14
30

<±1°C

±1°C

Control Stability
Repeatability ±0.5°C
Cooldown Time 125° - 60°C

Dissipation/Mean Temperature Rise
125°C
150°C

(1)

Time to temperature will be slightly longer for lower voltages due to heater kW derating (empty oven).

(2)

Figures are based on a nine-point survey in an empty oven. Uniformity can vary slightly depending

on unit and operating conditions.

(3)

∆

In control stability figures represent the change in ambient temperature.

(4)

Dissipation is reduced by 17% on 50-Hertz operation. Temperature gradient/mean temperature rise is

with an evenly distributed live load.

(3)

40 Min. 11 Min.

(4)

80°C

±0.5°C per 5°C ∆

800 Watts/4°C
1,300 Watts/6°C
1,400 Watts/6°C

Note: Testing performed on 240V-1PH-60HZ.

6

Power

Line voltages may vary in some geographical locations.
If your line voltage is much lower than the oven voltage
rating, warm up time will be longer and motors may
overload or run hot. If your line voltage is higher than
nameplate rating, the motor may run hot and draw
excessive amps.

If the line voltage varies more than 10% from the oven
voltage rating, some electrical components such as
relays, temperature controls, etc. may operate
erratically.

Power Requirements

WARNING:

All grounding and safety
equipment must be in compliance
with applicable codes, ordinances
and accepted safe practices.

WARNING:
Failure to read this warning
can result in death, serious
bodily injury or property
damage. All conductors
must be copper unless the
specific terminal is marked
for use with aluminum
conductors.

Volts Amps Hertz Phase Heater KW

208 23 60 1 3
220 24 50 1 3.4
240 24 60 1 4

7

THEORY OF OPERATION

Despatch RBC1-50 Burn-In ovens are made for the accelerated life testing of
microcircuit electronic devices to identify early mortality. The Despatch RBC1-50 ovens
are ideally suited for:

• high-dissipation forward-bias burn-in,

• high temperature reverse-bias burn-in,

• stabilization baking of integrated circuits and other semiconductor devices.

Air atmosphere ovens recirculate air through the chamber. They can add heat and
remove dissipated heat. Air is taken from the burn-in room and circulated through the
oven. Heat is added by electric resistance elements, or removed through automatically
controlled exhaust.

Temperature Control

A modular microprocessor based digital temperature controller regulates the process.
The control utilizes a time-proportioning voltage signal to control heating, and a milliamp
signal to control cooling with minimal temperature fluctuations.

The controller temperature-sensing element, located in the air return plenum area,
senses the median air temperature of the oven. The controller automatically controls
heat dissipated by sending a signal to the automatic damper modulator. This automatic
damper controls the amount of fresh air drawn into the chamber, preventing excessive
cooling and conserving energy.

The high limit control protects the product and/or the oven from overheating. If the
product being processed has a critical high temperature limit, the high limit setpoint
should be set to a temperature somewhat below the temperature at which the product
could be damaged. If the product does not have a critical high temperature limit, the
high limit setpoint should be set 5 to 15 degrees higher than the maximum-programmed
setpoint at which the oven will operate. When the high limit trips, the alarm horn will
sound.

Please refer to the manufacturer’s manual on the control and high limit.

8