Despatch LFD Installation Manual

C-186
PN 143378
REVISION H

3/2009

LFD SERIES OVEN
WITH PROTOCOL

PLUS

INSTRUCTION MANUAL

™

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.

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 [phone].

Thank you for choosing Despatch.
Sincerely,

Despatch Industries

PREFACE

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.

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
for operating the control instrument, a Troubleshoot­ing Table, a list of Accessories and a Warranty.

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.

i

Revision B: Corrected Sensor Calibration Page instruction
Revision C: Added definitions and sample profile to Program Page description
Revision D: Modified per Rev C Protocol Plus software
Revision E: Update to Protocol Plus software version 4.0.
Revision F: Revised Protocol Plus times. Updated Despatch Address.
Revision G: Updated Warranty
Revision H: Updated Controller Section

ii

TABLE OF CONTENTS

INTRODUCTION .......................................................................................................................... 1

Special Features ............................................................................................................... 1

Specifications .................................................................................................................... 2

Dimensions ............................................................................................................ 2

Capacities .............................................................................................................. 2

Temperature .......................................................................................................... 3

Power .................................................................................................................... 4

THEORY OF OPERATION ........................................................................................................... 5

Damper Control ................................................................................................................. 6

Determining Damper Settings ............................................................................... 6

Full Closed Position ................................................................................... 6

Full Open Position ..................................................................................... 7

Other Damper Settings .............................................................................. 7

OVEN INSTRUCTIONS ................................................................................................................ 8

Unpacking and Inspection ................................................................................................. 8

Set-up ................................................................................................................................ 9

Operating ........................................................................................................................ 10

Loading the Oven ................................................................................................ 10

Pre-Startup Checklist .......................................................................................... 11

Startup ................................................................................................................. 11

CONTROL .................................................................................................................................. 13

Theory of Control Operation ............................................................................................ 13

Operating Modes ................................................................................................. 15

Setup Mode ......................................................................................................... 15

Fast Start Mode ................................................................................................... 15

High Limit ............................................................................................................ 16

Indicators ............................................................................................................. 16

Displays ............................................................................................................... 17

Key Functions ...................................................................................................... 17

Outputs ................................................................................................................ 18

Relay (Continued) ............................................................................................... 19

Communication ................................................................................................... 19

Optional Software ................................................................................................ 19

INSTRUCTIONS ......................................................................................................................... 20

Start-Up ........................................................................................................................... 20

Operation ........................................................................................................................ 21

Manual Mode ....................................................................................................... 21

Timer Mode ......................................................................................................... 22

Profile Mode ........................................................................................................ 23

Auto Start Mode .................................................................................................. 23

Setup Mode ......................................................................................................... 24

Instructions for Setup Mode Pages ................................................................................. 25

Program Page ..................................................................................................... 25

Profile # ................................................................................................... 27

Sample Profile ..................................................................................................... 28

Auto Start Page ................................................................................................... 29

PID Page ............................................................................................................. 31

iii

Control Page ....................................................................................................... 32

Communication Page (optional) .......................................................................... 33

Real Time Clock Page ......................................................................................... 33

Relay Outputs Page (optional) ............................................................................ 34

Test Page ............................................................................................................ 35

Zone Calibration Page ......................................................................................... 36

Sensor Calibration Page ..................................................................................... 38

Enable Page ........................................................................................................ 40

Digital Inputs (optional) ........................................................................................ 41

Error Messages and Alarms ............................................................................................ 42

Quick Reference and Default Values .............................................................................. 43

Technical Specifications .................................................................................................. 50

MAINTENANCE .......................................................................................................................... 51

Checklist .......................................................................................................................... 51

Tests ............................................................................................................................... 52

Replacement ................................................................................................................... 53

Parts .................................................................................................................... 53

Protocol Plus™ Instrument ............................................................................................. 54

Fan Motor ........................................................................................................................ 55

TROUBLESHOOTING ................................................................................................................ 57

APPENDIX .................................................................................................................................. 59

Temperature Scale Conversion (C/F) ............................................................................. 59

Optional MRC5000 Recorder Setup ............................................................................... 60

iv

1

INTRODUCTION

This section provides an overview of the Despatch LFD Series forced air oven. The
LFD Series Ovens have the most effective heat distribution and the fastest processing
time of any lab oven their size. Air is discharged from the left side wall of the oven and
circulates through the chamber.

Special Features

The sturdy construction and three inch insulation of the Despatch LFD Series ovens
contribute to excellent temperature uniformity.

Other special features include the following:

Class A design features forced exhaust with airflow switch, pressure relief panel,

and purge timer.

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.

2

Specifications

Model

Chamber Size

in (cm)

Capacity

feet3

(liters)

Overall Size

in (cm)

Maximum

Number of

Shelf

Positions

Exhaust

Dimension

inches (cm)

W D H W D

H

LFD 1-42

LFD 2-11

LFD 2-24

20

(50)

38

(96)

48

(122)

18

(46)

20

(50)

24

(61)

20

(51)

26

(66)

36

(91)

4.2

(120)

11.0

(310)

24.0

(680)

33

(84)

54

(137)

66

(166)

41

(104)

35

(88)

38

(98)

45

(114)

78

(198)

89

(226)

9

6

9

1.75 x 2.75
(4.5 x 7.0)

3.5 x 8.5

(8.9 x 21.6)

3.5 x 8.5

(8.9 x 21.6)

Model

LFD 1-42

LFD 2-11

LFD 2-24

Maximum Load Lbs
Maximum Shelf Load Lbs
Exhaust at 177°C (350°F) CFM

HP
Recirculating Fan CFM

HP
Approximate Weight Net Lbs.

KG
Approximate Shipping Weight Lbs.

KG
Solvent Handling Capabilities

at 177°C (350°F)

150
30
25 to 93

1/50
300

1/4
380

173
510

232

0.025 GPH
of VM and P
Naptha

180
60
38 to 300

1/3
1,000

1
795

361
1,095

498

0.042 GPH
of VM and P
Naptha

300
100
122 to 300

1/3
1,500

2
1,065

484
1,465

666

0.14 GPH
of VM and P Naptha

Dimensions

Capacities

3

Temperature

Model

LFD 1-42

LFD 2-11

LFD 2-24

Time to Temperature 25°C - 100°C
(approximate minutes with 25°C - 200°C
no load) 25°C - 343°C

4
10
35

4
10
30

2
10
40

Recovery Time Door Open 1 Min. 100°C
(approximate minutes with 200°C
no load) 343°C

<1
2
4

<1
3
8

<1
3
7

Temperature Uniformity at 100°C*
200°C*
343°C*

±1°C
±2°C
±4°C

±1°C
±2°C
±4°C

±1°C
±2°C
±4°C

Minimum Operating Temperature dampers open
(Approximate w/20 C ambient) dampers closed

40°C
50°C

30°C
40°C

30°C
55°C

Control Stability

±0.3°C

±0.3°C

±0.3°C

Repeatability

±0.5°C

±0.5°C

±0.5°C

Cooldown Time 343 - 50°C dampers open
(approximate 343 - 75°C dampers closed
minutes with no load)

46
110

40
120

27
85

* Figures are based on actual tests in an empty oven. Uniformity can vary slightly

depending on unit and operating conditions.

4

Power

Model

Volts

Amps

Hertz

Phase

Heater KW

LFD 1-42
LFD 2-11

LFD 2-24

240*
208
240
480
208
240
480

28.7

39.7

34.9

17.5

76.2

66.8

33.4

50/60
60
60
60
60
60
60

1
3
3
3
3
3
3

6
12
12
12
24
24
24

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 name plate 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

* Oven designed for 240 volts (see name plate on oven) will operate satisfactorily on a

minimum of 208 volts, but with a 25% reduction in heater power. If your power
characteristics are lower, contact Despatch Industries. An option is available to regain
the full heater power when operating on 208V.

5

THEORY OF OPERATION

Fresh
Air

This section details the function and operation of assemblies and subassemblies on the
Despatch LFD Series Ovens. These ovens have the most effective heat distribution
system and the fastest processing time of any lab ovens their size. They are especially
useful for testing, preheating, sterilizing, drying, aging and curing as well as other
production applications. Horizontal airflow with precision digital control delivers uniform,
fast processing. The overall result is efficient productivity under strenuous conditions.

Figure 1. Horizontal Airflow

The unique Despatch computerized design, moves forced convected heat through
perforated stainless steel walls. The air is recirculated with a high volume fan.
Despatch LFD Series Ovens employ higher volume fans than any competitive model.
The chamber can be densely loaded without interfering with the process. The LFD
series air delivery temperature is within 1/2° C of the number appearing on the digital
display. Also, fresh air intake is regulated by a panel-mounted damper control. The
exhaust rate is regulated by an adjustable control on the exhaust stack.

6

Damper Control

The oven is equipped with a manually adjustable damper mechanism. The damper
control arm is located on the front panel of the oven. The damper adjustment controls
the flow of fresh air into the chamber. If the damper is in the full open position, the
maximum amount of fresh air is distributed into the chamber. An additional adjustable
damper is provided on the exhaust.

In the full closed position of an LFD oven, a pre-determined amount of fresh air is
allowed into the chamber due to cutaways provided in the fresh air and exhaust
dampers. This minimum amount of fresh air is required by NFPA86 safety guidelines
for Class A ovens.

Determining Damper Settings

The optimum setting for the amount of fresh air that should be distributed into the
chamber depends on several factors. These factors include ambient environment
temperature, load conditions, load distribution, heat up rates, cool down rates, desired
temperature uniformity and most importantly the desired operating temperature. To
consider all of these variables at any one point in time is not practical and there are
engineering tradeoffs that should be considered. Therefore guidelines should be used
to determine the fresh air damper setting.

In general, the damper should be set so that the amount of fresh air flowing into the
chamber agrees with the desired operating temperature conditions. The following
outline shows the considerations involved with various damper position settings.

Full Closed Position

When the fresh air damper is in the full closed position, the chamber will be able to
achieve the maximum attainable heat up rates for the chamber. In addition, the
chamber will use the minimum amount of power to operate at the desired temperature.
In almost all cases, the fresh air damper should be in the full closed position in order to
efficiently operate at the maximum operating temperature for the chamber.

7

Full Open Position

When the fresh air damper is in the full open position, the chamber will operate at its
minimum operating temperature.

Friction heat from the air recirculation system builds up in the chamber. This causes
chamber temperature to rise slightly even though the heating system is not turned on.
After the recirculation motor has been on for an extended period of time, the chamber
will reach a thermal equilibrium temperature.

When the damper is not set to the full open position, the chamber has no way to readily
dissipate the heat generated by the friction. With the fresh air damper fully open, the
thermal equilibrium temperature is the minimum operating temperature of the chamber.

Other Damper Settings

The damper can be set to several other distinct operating positions. In most cases the
damper setting is influenced by two specific performance factors. The two performance
factors are uniformity and cool down rates.

The uniformity of the chamber is influenced by the inside chamber pressure of the
system. The pressure inside the chamber is dependant on the amount of fresh air
flowing into the chamber. When a large volume of fresh air is flowing into the chamber,
the chamber becomes slightly pressurized and the overall temperature uniformity
improves. The slightly pressurized chamber produces the effect of "pushing" the air to
the corners of the chamber. Typically the corners of the chamber will improve with
respect to temperature distribution while the core of the chamber will maintain excellent
uniformity characteristics regardless of the damper position. Therefore, the
pressurization of the chamber typically is a factor when the chamber is loaded heavily.
Adjusting the exhaust damper will aid in pressurizing the chamber. The best uniformity
results, with respect to the product, are achieved when no more than two-thirds of any
inside chamber dimension are used. The best overall results are achieved when the
product(s) are located in the center of the chamber.

8

OVEN INSTRUCTIONS

The INSTRUCTIONS section provides directions for unpacking, installation, operation
and maintenance of the LFD Series oven.

Unpacking and Inspection

Remove all packing materials and thoroughly inspect the oven for damage of any kind
that could have occurred during shipment.

See whether the carton and plastic cover sheet inside carton are still in good

condition.
Look at all outside surfaces and corners of the oven for scratches and dents.
Check the oven controls and indicators for normal movement, bent shafts,

cracks, chips or missing parts such as knobs and lenses.
Check the door and latch for smooth operation.

If there is damage that may have occurred during shipment, follow these instructions.

1. Contact the shipper immediately and file a written damage claim.

2. Contact Despatch Industries to report your findings and to order replacement
parts for those that were damaged or missing.

3. Send a copy of your filed damage claims to Despatch.

4. Next, check to make sure you have received all the required materials. Your
shipment should include:

One (1) Despatch oven,
One (1) Instruction manual,
One (1) Warranty card,
Two (2) Shelves
One (1) Package containing four rubber feet (LFD1-42 only).

5. If any of these items are missing from the packaged contents, contact Despatch
Industries to have the appropriate materials forwarded to you.

6. Finally, to protect the warranty on your new LFD Series Oven, complete the
warranty card and mail it to Despatch within 15 days after receipt of the
equipment.

9

Set-up

WARNING:

Do not use the oven in wet,
corrosive or explosive
atmospheres unless this oven is
specifically designed for a
special atmosphere.

WARNING:

Do not use the oven in wet,
corrosive or explosive
atmospheres unless this oven is
specifically designed for a
special atmosphere.

1. Select the location for installing your oven.
If solvents are going to be used in the oven,

you must install an exhaust stack to the
outside of the building. Go to step 2.

If no exhaust stack is necessary, go to step 3.

2. Install an exhaust stack from the rectangular exhaust fan discharge stack to the
outside of the building.

If a round exhaust stack is used, a minimum area greater than the area of

the exhaust stack is required.

The flashing through the roof or wall must be capable of handling an

exhaust stack temperature up to 343°C (650°F).

All stacks must comply with state and local building codes to insure that

surrounding combustible surfaces are below 71°C (160°F).

Design the exhaust stack to limit the amount of restrictions to insure

proper airflow. If more than two (2) elbows are used in the stack, over all
airflow will be reduced. If airflow is reduced, the amount of solvent that
can be safely used with the equipment must also be reduced.

3. Place oven on a bench top or an optional cabinet base, or directly on the floor.
The oven must have a minimum 2 inch clearance in the rear to provide proper

ventilation. When placed next to another cabinet, or next to another oven, a 3
inch clearance is required. The doors will still open.

4. Make sure oven is level and plumb; this will assure proper heat distribution and
operation of all mechanical components.

5. Identify correct power source indicated on the
specification plate.

6. On the larger units, remove the control panel
and the filler panel to expose the equipment
mounting area.

7. Hardwire the oven directly to the electric supply. On larger units the oven line
connection is located on the equipment mounting panel.

10

Operating

WARNING:

Do not use the oven in wet,
corrosive or explosive
atmospheres unless this oven is
specifically designed for a
special atmosphere.

WARNING:

This equipment is designed for
a specific amount of solvent.
Exceeding this amount could
result in explosion.

Users and operators of this oven must comply with
operating procedures and training of operating
personnel as required by the Occupational Safety and
Health Act (OSHA) of 1970, Section 5 and relevant
safety standards, and 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.

Loading the Oven

Despatch Industries cannot be responsible for either the process or process
temperature used, or for the quality of the product being processed. It is the
responsibility of the purchaser and operator to see that the product undergoing
processing in a Despatch oven is adequately protected from damage.

Carefully following the instructions in this manual will help the purchaser and operator in
fulfilling that responsibility.

When loading the oven avoid spills of anything onto
the heater elements or onto the floor of the oven. Do
not place the load on the oven floor plate. This may
cause the load to heat unevenly and the weight may
cause shorting out of the heater elements. Use the
shelves provided.

The two shelves are designed to be pulled out about half way without tipping. The
support capacity of the shelves is listed in the Capacities Table in the Specifications
section in this manual. Do not overload the shelves.

Distribute the workload evenly so that airflow is not restricted. Do not overfill your oven.
The workload should not take up more than two-thirds of any dimension of the inside
cavity.

11

Pre-Startup Checklist

Know the system. Read this manual carefully. Make use of its instructions and

explanations. Safe, continuous, satisfactory, trouble-free operation depends
primarily on your understanding of the system and your willingness to keep all
parts in proper operating condition.

Check line voltage. Voltage must correspond to nameplate requirements of

motors and controls. Refer to the section on power connections in the
INTRODUCTION of this manual.

Fresh air and exhaust. Do not be careless about restrictions in and around the

fresh air and exhaust openings and stacks. Under no condition permit them to
become so filled with dirt that they appreciably reduce the air quantity. The
proper ventilation clearances should be fulfilled at all times. Refer to the Set-up
instructions in this manual.

Helpful hints
For drying ovens, open vent to prevent buildup of moisture.
For sample heating, close the vent when no ventilation is required.

Startup

For fastest oven heat-up time, close the fresh-air vent. After the desired temperature is
reached, the vent may be adjusted as needed.

1. Start Fan.
a. Open oven door.
b. Press Power switch to the On position. You will hear the exhaust and

recirculating fans start.
c. Shut oven door.
d. Check that the control display turns on.

2. Operate the temperature control as desired by following the control operation
instructions that follow.

12

Note that in a Class A oven, the heater can not be energized until the forced exhaust
system has brought in a minimum amount of fresh air into the chamber. The purge
timer provided prevents the heater from energizing until the oven has had enough time
to bring in the amount of fresh air required. The purge timer is energized by the airflow
switch which closes when the exhaust system is running.

The pre-determined purge time is two minutes for the LFD1-42 and LFD2-24 and three
minutes for the LFD2-11.

13

CONTROL

The special features of the Protocol PlusTM control include:

PID tuning
Ramp/Soak programming of up to 64 segments
Segment looping and profile linking
Built-in manual reset high limit control
Built-in process timer
Dedicated LED display for process temperature
Multi-purpose two-line LCD display with backlight
Auto-tuning
Security access
Process temperature retransmission signal
Digital inputs for remote profile control
Real time clock
Optional relay outputs for events, alarms, or end-of-cycle signal
Optional RS232/RS422/RS485 MODBUS communications

Theory of Control Operation

The Protocol Plus is a modular microprocessor based digital temperature controller. The
Protocol Plus operates as a dual functioning controller/high limit instrument. The control
portion utilizes a time-proportioning voltage signal to control heating devices with
minimal temperature fluctuations.

The high limit portion 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.

14

Protocol Plus Faceplate and Wiring Diagram

15

Operating Modes

The Protocol Plus control has five modes of operation available:
Stopped Mode: All control and relay outputs are off. Stopped Mode is integrated

into each of the following four modes of operation.

Manual Mode: Control operates as a single setpoint control until Stopped mode is

accessed

Timer Mode: Control operates as a single setpoint control until preset time period

has expired.

Profile Mode: Control operates as a ramp/soak profiling control until the end of

the profile. 8 profiles are available with up to 8 ramp/soak segments
in each profile.

Auto Start Mode: Control may automatically start Manual, Timer, or Profile mode

based on a preset time and day.

The optional event outputs can be utilized during Manual, Timer, or Profile modes.

Setup Mode

The control has a Setup Mode which provides access to control configuration and
programming of profiles. The Setup Mode contains ten separate electronic Pages where
the configuration and programming parameters (Menu items) are found. The Setup
Mode Pages are described in detail elsewhere in this manual.

Fast Start Mode

The Protocol Plus control has the ability to automatically start an operating mode when
power is applied. This feature may be useful if the same mode of operation is used
everyday. The user can turn on the power and the oven will start the desired process
automatically. The Fast Start Mode is controlled by the Power-Up Start parameters on
the Control page (see Setup Mode).

16

High Limit

The control has an integrated high limit function which will disable the heater output
when tripped. If the high limit does trip, the relay will need to be manually reset. When
the high limit relay is tripped, the Hi-Limit indicator will be lit. Allow the oven to cool
several degrees (or increase the high limit setpoint) and then press the Reset key. The
indicator will turn off.

High-Limit temperature readout is provided on LCD Line #2 in all Modes (Stop, Run,
Hold, and Standby) except Setup Mode. High-Limit temperature is displayed for 10
seconds, alternating with current Mode and Status display for 10 seconds.

The control will not allow the high limit setpoint to be set below the current setpoint
value.

Indicators

The Protocol Plus control has 12 indicating LEDs that provide operational information to
the user.

Power LED: Indicates that power is supplied to the instrument.
Heater LED: Indicates that the heater output is active.
Profile LED: Indicates that the Profile Mode is in operation.
Timer LED: Indicates that the Timer Mode is in operation.
Manual LED: Indicates that the Manual Mode is in operation.
Cycle Complete LED: Indicates that the control is in Stopped mode.
Hi-Limit Alarm LED: Indicates that the high limit relay has tripped

(de-energized).

Soak Alarm LED: Indicates that the guaranteed soak deviation is in alarm

condition.

Outputs 1 through 4: Indicate that the optional relay outputs are in the ON

state. These outputs may be configured as timed event outputs, process
temperature trip point outputs, alarm outputs, or as an end of cycle relay output.
The ON state can be configured as energized or de-energized.

17

Displays

The Protocol Plus control has two displays. A dedicated LED upper display shows the
oven temperature. A two-line LCD lower display provides information on control status,
high limit temperature, and allows changes to be made to the control settings.

Key Functions

The Protocol Plus control has seven keys that provide operation.

Select key: Press to select mode of operation. In Setup Mode, to select profile

number or relay. In Profile/Run Mode, press simultaneously with the UP key to
advance a segment.

Run/Hold key: Press to activate a mode of operation. If a Profile (or Timer)

Mode is running, pressing the Run/Hold key will place the Profile (or Timer) in
Hold status. A subsequent press will resume the Profile (Timer).

Stop key: Press to stop any mode of operation.
Page/Reset key: While in Setup Mode, press to access different Pages of

configuration, Press this key to silence an alarm if the instrument alarm sounds
during operation. In an operating mode, if an alarm or error condition occurs,
press this key to return the instrument to normal operation once the condition is
cleared.

Menu/View key: While running any operating mode, pressing this key will

display the high limit setpoint. While in Setup Mode, pressing this key will provide
access to each Menu parameter.

keys: Press these keys to adjust parameter settings. In Profile/Stopped

Mode, press to select profile to run. In Profile/Run Mode, press key
simultaneously with the Select key to force the program to advance one
segment.

18

Outputs

The Protocol Plus control has seven different outputs available.

Heating output: The control output is a DC voltage open-collector output which

is time-proportioned and designed to control a heat control device such as a solid
state relay.

High limit: The high limit output is a form C relay which is energized under

normal operating conditions. If the control senses a temperature higher than the
high limit setpoint, or if there is a sensor error, the high limit relay will de-energize
until the condition is cleared and the Reset key is pressed. When the high limit
relay is de-energized, the heater is disabled.

Retransmission: The retransmission output is a DC 1 to 5 volt or 4 to 20 ma

(DC) signal that is proportional to the process temperature. The signal can be an
input to other devices such as a chart recorder.

Relay (four optional outputs): The four form A dry contact relay outputs can be

configured to function as alarms, events, or end of cycle. These outputs can be
utilized in Manual, Timer, or Profile Mode.

Layout for Optional Components

19

Relay (Continued)
Use the Relay Card Optional Ay p/n 144562 to add relays to the standard controller.
Each relay card contains two relays (maximum of two cards Ay’s allowed).

Communication

The Protocol Plus control has optional MODBUS communication available which can
communicate via RS232, RS422, or RS485 to a computer. See communications option
assembly p/n 161957 for board and cable assembly. Please refer to the MODBUS
communications manual which comes with this option.

Optional Software

The Protocol Manager program allows the operator to start/stop multiple ovens (32
maximum) from a personal computer. A data log can also be used to record process
information (p.n. 140008).

20

INSTRUCTIONS
Start-Up

These instructions are provided as a quick reference for operating the Protocol Plus
control. If the Profile Mode is to be used, or the configuration of the control needs to be
changed, please refer to the Setup Mode instructions before operating the control. For
more detailed operating instructions refer to the Operation instructions for the mode you
wish to use.

Upon initial power-up the control is in Manual/Stopped Mode (unless the Autostart or
Fast Start Modes are active). To activate any operating mode from Stopped Mode,
press the Select key until the desired mode is displayed, then press the Run key. If the
proper Profile number is not displayed when the Profile Mode is accessed, press the
or keys until the desired Profile number is displayed, then press the Run key. If no
profile numbers can be displayed (display only reads NONE) then no profiles are
currently programmed (see Setup Mode).

The Hi-limit thermocouple actual temperature reading is displayed, when the lower LCD
display reads HL Temp. Note: This is not a error message.

The temperature setpoint can be adjusted while Manual or Timer Mode is running by
pressing the UP or DOWN key.

To momentarily hold the Timer or Profile Mode, press the Hold key. To continue the
Timer or Profile Mode, press the Run key.

To return to Stopped Mode at any time, press the Stop key and the cycle complete LED
will illuminate.

Note that the control can be configured to automatically activate Manual, Timer or
Profile Mode when power is applied (power switch turned on). See Control Page in the
Setup Mode to utilize the Fast Start mode.

21

Operation

Manual Mode

Press the Select key until Manual is displayed (note you can press the Run key at any
time to activate Manual Mode).

1. Press the Menu key to display the Process Temperature Setpoint (setpt). You
can change the Setpoint with the keys.

Note: If the SPChange parameter on the Enable page in Setup Mode has been
set to DISABLED, it must be changed to ENABLED before any changes to the
process temperature and high limit setpoints can be made.

2. Press the Menu key a second time to display current high limit setpoint (Hi-Lim
SP). The value can be adjusted by pressing the keys. If Band is displayed,
the high limit band feature is activated (see Control page) and the high limit can
not be adjusted.

3. (optional feature) Press the Menu key a third time to display Event1. Press the
key to turn on the event or to turn off the event. Repeat for all events which
are enabled (up to 4).

4. To start Manual Mode, press the Run key.

The display will change from Stop to Run. To return to Stopped Mode, press the
Stop key. While in operation, the process setpoint can be adjusted by using the

keys to change the value while the mode is running. Pressing the Menu key

will display the High Limit Setpoint (HLSP) setting.

If changes to the high limit setpoint or event output configuration are needed, they must
be done from the stopped mode.

22

Timer Mode

1. Press the Select key until Timer is displayed (note you can press the Run key at
any time to activate Timer Mode).

2. Press the Menu key to display the Process Temperature Setpoint (Setpt). You
can change the Setpoint with the keys.

Note that if the SPChange parameter on the Enable page in Setup Mode has
been set to DISABLED, it must be changed to ENABLED before any changes to
the process temperature and high limit setpoints can be made.

3. Press the Menu key a second time to display current high limit setpoint (Hi-lim
SP). The value can be adjusted by pressing the keys. If Band is displayed,
the high limit band feature is activated (see Control page) and the high limit can
not be adjusted.

4. Press the Menu key a third time to display Time Set. You can change the time
setting with the keys.

5. (optional feature) Press the Menu key a fourth time to display Event1. Press the

key to turn on the event or to turn off the event. Repeat for all events which

are enabled (up to 4).

6. Press the Menu key a fifth time to display the current guaranteed soak band
(TmrGuarSoak) value. If the process temperature deviates from the setpoint by
more than this value, the timer is placed in a hold condition. The timer continues
when the process temperature falls within range. Reference the Quick
Reference and Default Values section for available settings.

7. To start Timer Mode, press the Run key.
The display will change from Stop to Run and the time remaining will be

displayed. To return to Stopped Mode, press the Stop key. While in operation,
the process setpoint can be adjusted by using the keys to change the value
while the mode is running. Pressing the Menu key will display the High Limit
Setpoint.

Pressing the Run/Hold key while the Timer Mode is in operation will put the control in
Hold status. The Timer LED will flash to indicate the held status. Press the Run/Hold
key again to continue timing. The Timer LED will return to lit status.

23

Profile Mode

1. Press the Select key until Profile is displayed. “None” may be displayed if a
profile has not been selected or no profiles entered.

2. Press the key to display the desired profile to run.

3. To start Profile Mode, press the Run key.

The display will change from Stop to Run and the segment time remaining,
Temperature Setpoint, Profile #, along with the current segment number, will be
displayed. To return to Stopped Mode, press the Stop key.

Pressing the Run/Hold key while the Profile Mode is in operation will put the control in
Hold status. Press the Run/Hold key again to continue the mode. The Profile LED will
flash to indicate the hold status.

To advance to the next segment while running a profile, press the Select and UP arrow
keys at the same time.

If Link To is set to Standby in the Program Page, at the End of Program/Profile,

1. Cycle Complete LED indication goes ON.

2. Controller beeps if End of Cycle beep is enabled.

3. Heater/control output keeps controlling oven temperature at last Soak setpoint.

4. All events programmed (if relay cards installed and programmed as an event) for
the last Soak Segment stays active.

Note that ramping down too fast may cause the high limit relay to trip unexpectedly if
the high limit band feature is used. This can be avoided by using a separate cooling
profile that does not utilized the high limit band and then jumping to that profile to
perform rapid cooling.

Auto Start Mode

The Auto Start Mode allows the control to start Manual, Timer, or Profile mode
automatically at a preset time and day. See the Auto Start Page in Setup Mode for the
time, day, and operating mode settings.

To activate the Auto Start Mode,

1. On Auto Start page, Enable is set to Yes.

2. LCD reads Active on line 1 in Auto Start Mode.

3. On Auto Start page Enable set to No, will deactivate Auto Start Mode.

24

Note that once you activate Auto Start, you can continue to use all operating modes as
normal. If an operating mode is running at the time of a preset Auto Start function, and
Auto Start is activated, the existing operating mode will override the auto Start function
and the Auto Start will not turn on.

Note: All process Set to Run in Auto Start Mode must be at least one minute long for all
Run Modes (Manual, Timer, and Profile).

Setup Mode

Configuration of the control and programming of the ramp/soak profiles must be done in
the Setup Mode. To access Setup Mode, the control must first be in Stopped Mode.

1. Press the Select key until Setup is displayed.

2. Press the Page key and Security will be displayed.

3. Press the Menu key and Password will also be displayed. Use the keys to
enter the proper password.

4. Once the proper password is displayed, press the Page key twice to enter the
Setup Mode.

To exit Setup Mode, press and hold the Page key for three seconds.
The control has two levels of password-protected security. Level one provides access

only to those menu pages that are enabled on the Enable page. Level two provides
access to all menu pages, including the Enable page. The default security password
values are 1 for level one and 2 for level two.

If an improper password has been entered, the control will remain at the Security
display. To enter the proper password, press the Menu key. To exit Setup Mode, press
and hold the Page key for three seconds.

Mapping of the Setup Mode is provided in the following sections. To access each
parameter Page, which are described in detail in the following sections, press the Page
key until the desired page heading is displayed. Press the Menu key to access each
Menu parameter. Press the keys to change Menu parameter settings.

Refer to the Quick Reference and Default Values section for available settings for each
Menu parameter.

Press the Page key to continue with each Page, or press and hold the Page key for
three seconds to exit Setup Mode.

25

Instructions for Setup Mode Pages

Program Page

Programming of the profiles is provided on the Program Page. Eight profiles are
available with up to eight ramp and soak segments per profile.

If the optional relay outputs are installed, they must be configured as alarms or events
on the Relay Outputs Page before they can be utilized. If configured as event outputs,
these relays can be used as time or temperature events.

When entering the Program Page, press the Select key to select the profile you wish to
enter/edit, then press the Menu key. The first parameter (Profile #, Segment 1, Ramp
Time) will display. Adjust the time value with the keys. Once the proper value is
displayed, press the Menu key to continue. Continue with the Menu key to adjust/view
each parameter.

If the ramp time value of the current segment is left at 0:00, the next press of the Menu
key will advance the control to the High Limit Setpoint parameter for that profile.
Continue entering / verifying all parameters until you get to the last parameter
(Guaranteed Soak Band). Once all parameters have been properly entered, press the
Page key to return to the top of the Profile Page. You can press the Select key to
enter/edit another profile, press the Page key to access another page, or press and hold
the Page key to exit Setup mode.

While editing any profile, pressing the Select key will advance the control to the time
value for the next segment, until the last segment has been reached. This allows faster
editing of the profile rather than pressing the Menu key to advance past each
parameter.

If Link To is set to Standby in the Program Page, at the End of Program/Profile,

1. Cycle Complete LED indication goes ON.

2. Controller beeps if End of Cycle beep is enabled.

3. Heater/control output keeps controlling oven temperature at last Soak setpoint.

4. All events programmed (if relay cards installed and programmed as an event)

for the last Soak Segment stays active.

To run a profile indefinitely, link the profile to itself.

26 Menu Item

Display

Description

Ramp Time Seg 1

Pro-1 Seg-1 Ramp Time

Ramp time for segment 1 of profile

Event 1 Set Value*

Pro-1 Seg-1 Ramp Event 1

Event 1 setting for segment 1 ramp of profile

Event 2 Set Value*

Pro-1 Seg-1 Ramp Event 2

Event 2 setting for segment 1 ramp of profile

Event 3 Set Value*

Pro-1 Seg-1 Ramp Event 3

Event 3 setting for segment 1 ramp of profile

Event 4 Set Value*

Pro-1 Seg-1 Ramp Event 4

Event 4 setting for segment 1 ramp of profile

Soak Temp Seg 1

Pro-1 Seg 1 Soak Temp

Soak temperature for segment 1 of profile

Soak Time Seg 1

Pro-1 Seg 1 Soak Time

Soak time for segment 1 of profile

Event 1 Set Value*

Pro-1 Seg-1 Soak Event 1

Event 1 setting for segment 1 soak of profile

Event 2 Set Value*

Pro-1 Seg-1 Soak Event 2

Event 2 setting for segment 1 soak of profile

Event 3 Set Value*

Pro-1 Seg-1 Soak Event 3

Event 3 setting for segment 1 soak of profile

Event 4 Set Value*

Pro-1 Seg-1 Soak Event 4

Event 4 setting for segment 1 soak of profile

(repeat for segments 2-8, until ramp or soak time = 00:00)

High Limit Setpoint

Pro-1 Hi-Lim SP

High limit setpoint for profile**

Loop From

Pro-1 Loop From Seg

To start a loop action in a profile

Loop To

Pro-1 Loop To Seg

To end a loop action in a profile

Loop Count

Pro-1 Loop Number

Number of times to execute loop

Profile Link

Pro-1 Link To Pro

To jump from this profile to another

Guaranteed Soak

Pro-1 Guar Band

Guaranteed soak band for profile

See the definitions on the following pages for parameter ranges.

* only available if optional relay outputs are installed (repeat all for profiles 2-8)
** Set to Band to use the high limit band feature

27

Profile #

There are eight profiles available.

Segment#

Recipe segments 1 through 8 may be programmed, each with its own
set of events, ramp and soak times, and soak temperature.

Ramp Time

The time required to ramp from one setpoint up to another setpoint.
Values between 0 and 99:59 are allowable. In the Protocol Plus
controller, the profile ramp and soak times are stored without units.
Units are set as either hours and minutes (HH:MM) or minutes and
seconds (MM:SS). The setpoint will automatically increment from the
actual temperature to the soak temperature.

EV1 through 4

From 1 to 4 events may be programmed into the ramp time portion of
each segment here. These typically involve actuating/disabling relays
to close/open valves or perform other relay-controlled functions.
NOTE: These will only actuate when the controller has the relay cards
installed and programmed for an event.

Soak Temp.

The temperature setpoint of a particular segment is entered here; it
can range from -18 to 540 degrees C (0 to 1000 degrees F).

Soak Time

The duration of soak is entered here; the value can range from 0 to
99:59.

EV1 through 4

From 1 to 4 events may be programmed into the soak portion of each
segment here. These typically involve actuating/disabling relays to
close/open valves or perform other relay-controlled functions. NOTE:
These will only actuate when the controller has the relay cards
installed and programmed for an event.

Hi Limit SP

The high limit setpoint may be entered here; if the temperature
exceeds this value, the hi-limit will alarm and shut off the heater.

Loop From

Values are No, Seg-1 to Seg-8.

Loop To

Values are No, Seg-1 to Seg-8.

Loop Number

Values are 0 - 99.
These values enable the operator to jump from a certain step to
another step of the recipe a preset number of times.

Profile Link

Values are STANDBY/STOP/HOLD/1 - 8. When the profile ends, the
profile can hold the temperature setpoint while keeping the events
active, turn the heater off, hold the temperature setpoint at the end of
the profile, or jump to another specified profile.

Guaranteed
Soak Band

If the process temperature deviates from the setpoint by more than
this value, the soak timer is placed in a hold condition. The timer
continues when the process temperature falls within range.

28

Sample Profile

Seg-

ment

Ramp

Soak

Time

Events

Temp-

erature

Time

Events

1 2 3 4 1 2 3

4

1

01h00

100

01h00

2

02h00

50

00h01

3

00h00

4

5

6

7

8

High Limit Setpoint

115 Loop From Seg

No

Loop To Seg

No Loop Number

0

Link To Pro

No Guar Soak Band

10

Programming Table
Profile Number____1______ Profile Name__________

Auto Start Page

The Auto Start Page can be configured to automatically start Manual, Timer or Profile
Mode at a specified time and day. Note that if Auto Start Enable is set to Yes in the
Setup Mode, the Auto Start feature is not turned on - it is available to the operator to be
activated in Stopped Mode.

To configure the Auto Start feature:

1. Access the Setup Mode.

2. Press the Page key until Auto Start is displayed.

3. Press the Menu key. If there is no change in the display, the controller may not
have the realtime clock option.

4. Set Auto Start Enable to Yes.

5. Using the Menu key, scroll through the options available and use the keys
to set the mode desired for each day of the week. You may select from Manual,
Timer, or Profile 1 through 8.

6. When the mode is set press the Menu key.

7. Enter the time of day you wish the mode to activate.

8. Continue through the rest of the week by pressing the Menu key, or press the
Page key when done.

One Auto Start mode can be set for each day of the week. Exit the Setup mode by
pressing and holding the Page key for three seconds. Press the Select key until Auto
Start is displayed. Make sure the correct time and day is displayed. If not proper, set it
to the correct time on the Real Time Clock Page in the Setup mode.

To activate the Auto Start Mode,

1. On Auto Start page, Enable is set to Yes.

2. LCD reads Active on Line 1 in Auto Start Mode.

3. On Auto Start page Enable set to No, will deactivate Auto Start Mode.

Note that once you activate Auto Start, you can continue to use all operating modes as
normal. If an operating mode is running at the time of a preset Auto Start function, and
Auto Start is activated, the existing operating mode will override the Auto Start function
and the Auto Start will not turn on.

Note: All process Set to Run in Auto Start Mode must be at least one minute long for all
Run Modes (Manual, Timer, and Profile).

30

Menu Item

Display

Description

Range

Enable
Autostart

Auto Start Enable

Enable (yes) or disable (no) the
Autostart function

No, Yes

Sunday
mode

Auto Start Sun
Mode

Set mode on Sunday to activate

Off, Manual, Timer, Pro-1 to Pro-8

Sunday
time

Auto Start Sun
Time

Set time on Sunday for mode to
activate

00:00 to 23:59

Monday
mode

Auto Start Mon
Mode

Set mode on Monday to activate

Off, Manual, Timer, Pro-1 to Pro-8

Monday
time

Auto Start Mon
Time

Set time on Monday for mode to
activate

00:00 to 23:59

Tuesday
mode

Auto Start Tue
Mode

Set mode on Tuesday to activate

Off, Manual, Timer, Pro-1 to Pro-8

Tuesday
time

Auto Start Tue
Time

Set time on Tuesday for mode to
activate

00:00 to 23:59

Wednesday
mode

Auto Start Wed
Mode

Set mode on Wednesday to
activate

Off, Manual, Timer, Pro-1 to Pro-8

Wednesday
time

Auto Start Wed
Time

Set time on Wednesday for mode
to activate

00:00 to 23:59

Thursday
mode

Auto Start Thu
Mode

Set mode on Thursday to activate

Off, Manual, Timer, Pro-1 to Pro-8

Thursday
time

Auto Start Thu
Time

Set time on Thursday for mode to
activate

00:00 to 23:59

Friday
mode

Auto Start Fri
Mode

Set mode on Friday to activate

Off, Manual, Timer, Pro-1 to Pro-8

Friday time

Auto Start Fri
Time

Set time on Friday for mode to
activate

00:00 to 23:59

Saturday
mode

Auto Start Sat
Mode

Set mode on Saturday to activate

Off, Manual, Timer, Pro-1 to Pro-8

Saturday
time

Auto Start Sat
Time

Set time on Saturday for mode to
activate

00:00 to 23:59

31

PID Page

Menu Item

Display

Description

Range

Display units

PID Temp Unit

Set display units to °C or °F

°C or °F

Proportional
band

PID Prop Band

Set proportional band for tuning

1 to 56°C (1 to 100°F)

Integral reset

PID
Reset/Rep/Min

Set integral reset for tuning

0.0 to 100 seconds/repeat

Derivative
Rate

PID Rate In Sec

Set derivative rate for tuning

0.0 to 500 seconds

AutoTune

PID AutoTune

Enable auto tuning function

Disable, Enable

The PID Page contains parameters which control the response to the setpoint and
process variable input. To access the PID Page, enter the Setup Mode. Press the Page
key until PID is displayed. Press the Menu key. Each parameter can be changed by
pressing the Menu key until the desired parameter is displayed, and then pressing the

keys to change the value.

The AutoTune parameter disables or enables the AutoTune function. To utilize
AutoTuning:

1. Access the Setup Mode.

2. Press the Page key until the display reads AutoTune. Press the key to enable
the AutoTune.

3. Press the Page key for three seconds to exit Setup Mode.

4. Cycle power to the instrument.

5. Set Manual Mode to run. The display will alternately display AutoTune and
Manual.

If the Manual Mode setpoint is less than 50 degrees higher than the actual process
temperature, the AutoTune function will create an error condition. This can be cleared
by either cooling off the process temperature or increasing the setpoint until there is
more than 50 degrees between them. Once the AutoTune function is allowed to
complete tuning, the AutoTune parameter will disable by itself.

If you wish to cancel the AutoTune function, press the STOP key, access the PID page
in Setup Mode, and set the AutoTune parameter to Disable.

32

Control Page

Menu Item

Display

Description

Range

Cycle Time

Control Cycle
Time Sec

Set cycle time in seconds for
control output

1 to 60 seconds

High limit
setpoint

Control Hi-Lim
SP***

Maximum value for all high limit
setpoints

MinHiLimSP - MaxHiLimSP*

High limit
band

Control Hi-Lim
Band

If=0, high limit setpoint= Control
Hi-Lim SP If>0, high limit
setpoint= Control SP* + Band

Off, 3°C to 11°C (5°F to 20°F)

Power fail
recovery

Control PwrFRec

Controls response to loss of
power

Stop, Restart, Hold, Resume

Recovery
time limit

Control PFRTime

Control aborts to Stopped mode if
power is lost for time period
longer then set value

00m00s to 99m59s

Powerup
start enable

ControlPwrUpStrt

Allows mode to automatically
start when power is first applied

Disable, Enable

Powerup
Start Mode

Control StrtMode

Operating mode for powerup start

Off, Manual, Timer, Pro-1 to Pro-8

Hysteresis

Control
Hysteresis

Hysteresis for all alarms and
temperature events

1°C to 56°C (1°F to 100°F)

Process out
low

Control
RetOutLo

Process value for retransmit
output = 1VDC

-73°C to 760°C (-100°F to 1400°F)

Process out
high

Control RetOutHi

Process value for retransmit
output = 5VDC

-73°C to 760°C (-100°F to 1400°F)

Time scale

Control
TimeScale

Time scale setting for program
and timer mode**

hh:mm or mm:ss

Key press
beep

Control KeyBeep

Internal beeper sounds when key
is pressed

On or Off

End of cycle
beep

Control
EOCBeep

Internal beeper sounds at end of
cycle

On or Off

Alarm beep

Control
AlarmBeep

Internal beeper sounds for alarms

On or Off

The Control Page contains various parameters which control miscellaneous functions.
To access the Control Page, enter the Setup Mode. Press the Page key until Control is
displayed. Press the Menu key. Each parameter can be changed by pressing the Menu
key until the desired parameter is displayed, and then pressing the keys to change
the value.

* includes ramping setpoints during profiles and controlled ramps
** power fail recovery time limit is always MM:SS regardless of time scale setting
*** high limit setpoint is a read-only item which is calculated on Enable page

33

Communication Page (optional)

Menu Item

Display

Description

Range

Address

Communication CommAddr

Sets address node for
control

1 to 247

Mode

Communication Mode

Turns on/off
communications

OFF, Modbus

Baud Rate

Communication BaudRate

Sets interface speed

2400, 4800, 9600, 19.2K,

38.4K

Parity

Communication Parity

Sets parity for interface

None, Odd, Even

Menu Item

Display

Description

Range

Day of the
week

Clock Day

Setting for current day of the week

Sun, Mon, Tue, Wed, Thu, Fri, Sat

Time of
day

Clock HH:MM

Setting for current time of the day

00:00 to 23:59

Reset
clock

Clock UP to
Reset CLK*

Press the key to set the clock
to entered values

Ready, Done

The Communication Page contains parameters for the communications feature. To
access the Communications Page, enter the Setup Mode (see description earlier in this
manual). Press the Page key until Communication is displayed. Press the Menu key.
(NOTE: If there is no change in the display, the controller does not have the
communications board installed.) Each parameter can be changed by pressing the
Menu key until the desired parameter is displayed, and then pressing the keys to
change the value.

Real Time Clock Page

The Real Time Clock Page allows the control to be configured to have an operating
mode begin automatically at a specific time on a specific day of the week. The real time
clock feature is also used for using the Power Failure Recovery mode Time Limit
feature (see Control Page). The real time clock is a seven day, 24 hour clock with
battery backup.

To access the Real Time Clock Page, enter the Setup Mode. Press the Page key until
Clock is displayed. Press the Menu key. Each parameter can be changed by pressing
the Menu key until the desired parameter is displayed, and then pressing the keys
to change the value.

* If the key is not pressed, the clock values will retain their original values. The
display will change to Done if the clock is reset

34

Relay Outputs Page (optional)

Menu Item

Display

Description

Range

Type of relay

Relay 1
RelayType

Set function of relay

Off, Alarm, Cycl, Ev1 to Ev4

Action of relay

Relay 1
RelayAction

Set coil and contact state of
relay

NDE, NE, NDEL, NEL*****

Type of
alarm*

Relay 1
AlarmType

Set alarm type for relay

High, Low, Plus, Minus, Band

Alarm
setpoint*

Relay 1 AlmHi/Lo
SP

Setpoint for alarm

-73°C to 760°C (-100°F to 1400°F)

Alarm
deviation*

Relay 1
AlmDevBand

Deviation band for alarm

1 to 56°C (1 to 100°F)

Inhibit alarm*

Relay 1
ALMInhibit

Inhibits alarm until "safe"
condition is reached

En or Dis

Type of
event**

Relay 1
EventType

Set event type for relay

Time or Temp

Event
setpoint***

Relay 1 Event SP

Setpoint for temperature event

SPLoLim to SPUpLim****

The Relay Outputs Page configures the four alarm/event outputs. Each output has a
dedicated indicator light and can be configured as a temperature alarm, profile event, or
end of cycle output. Temperature alarms can be of type process high, process low,
deviation high, deviation low, or deviation band.

To access the Relay Page, enter the Setup Mode (see description earlier in this
manual). Press the Page key until Relay is displayed. Press the Select key until the
desired relay output is selected. Press the Menu key. Each parameter can be changed
by pressing the Menu key until the desired parameter is displayed, and then pressing
the keys to change the value. To configure a specific relay, press the Select key
until the desired relay appears.

NOTE: If Relay 0 appears, then no relays are installed (see relay kit assembly p.n.

144562).

(repeat for relay outputs 2-4, if available)
* appears only for alarm types

** appears only for time or temperature event types
*** appears only for temperature event types

Turning on the Alarm Inhibit function disables the alarm output on power up until the
process temperature has reached a non-alarming condition ("safe").

If the relay output has been configured as latching, the RESET key must be pressed to
return the output to the non-alarm state once the alarm condition has cleared.

35

Test Page

Menu Item

Display

Description

Range

Heater
output

Test HeatOut

Activate SSR output 100%

On

High limit
relay

Test HiLimOut

Activate high limit alarm
(de-energize relay)

On

Relay 1
output

Test Rly1 Out

Energize relay output 1

On

Relay 2
output

Test Rly2 Out

Energize relay output 2

On

Relay 3
output

Test Rly3 Out

Energize relay output 3

On

Relay 4
output

Test Rly4 Out

Energize relay output 4

On

HiLim
Sensor

Test HL Temp
(push and hold up)

Displays sensor reading*

The Test Page contains parameters which allow manual control of the heat control and
optional relay outputs and should be used only for testing the functionality of the control
instrument. Do not operate the oven for processes using the Test Page.

To access the Test Page, enter the Setup Mode (see description earlier in this manual).
Press the Page key until Test is displayed. Press the Menu key. Each parameter can be
changed by pressing the Menu key until the desired parameter is displayed, and then
pressing the keys to change the value.

*Push key to refresh display
When the Test Page is entered, all outputs are automatically set to off. When exiting

the Test Page, all outputs will return to their previous condition regardless of the Test
Page settings.

36

Zone Calibration Page

Menu Item

Display

Description

Range

Zone 1
actual

Zone Cal
Zone1Act

Point at which Zone 1 is set (center
of chamber)

-73°C to 760°C (-100°F to 1400°F)

Zone1
displayed

Zone Cal
Zone1Dis

Desired displayed value for Zone 1
setting

-73°C to 760°C (-100°F to 1400°F)

Zone 2
actual

Zone Cal
Zone2Act

Point at which Zone 2 is set (center
of chamber)

-73°C to 760°C (-100°F to 1400°F)

Zone2
displayed

Zone Cal
Zone2Dis

Desired displayed value for Zone 2
setting

-73°C to 760°C (-100°F to 1400°F)

Factory
calibration*

Zone Cal
FactCal

Restores the factory calibration
values

Ready or Done (push- key)

The Zone Calibration Page allows adjustment of the displayed temperature versus the
actual temperature measured by the control thermocouple. This may be desirable in
certain conditions where the center of the oven chamber is not the same temperature as
the control thermocouple. This may occur when the oven is not allowed to soak at a
constant temperature for long periods of time, or the oven is being used at high
temperature.

There is also a Factory Calibration Recovery which will restore the factory calibration
values when the control was first shipped by the manufacturer. This may be helpful if
the calibration has been lost and a calibration instrument is not readily available. To use
the Factory Calibration Recovery feature only, bypass the Zone 1 and Zone 2
calibration parameters by pressing the Menu key.

To access the Zone Calibration Page, enter the Setup Mode (see description earlier in
this manual). Press the Page key until Zone Cal is displayed. Press the Menu key. Each
parameter can be changed by pressing the Menu key until the desired parameter is
displayed, and then pressing the keys to change the value.

*Only use when no calibration instrument is available, push key to restore factory
values.

Press the Page key to exit the Zone Calibration Page.
Two points of display calibration (temperature offset) are available. The Zone 1 Actual

and Zone 2 Actual parameters are the two temperature points where the offset is to take
effect. These values are adjustable. The Zone 1 and Zone 2 Displayed parameters are
the values the user wishes to have displayed at the Actual temperatures, and are also
adjustable.

37

As an example, the control is displaying 400°F with the setpoint being 400°F, but the
center of the oven chamber is actually 395°F. This can occur due to oven wall losses
and product loading variations. The operator may change the zone calibration so that
the center of the oven is 400°F when the display reads 400°F. In this case operate the
oven in manual mode with a setpoint of 400°F. Record the center of the chamber (as
measured with an independent sensor). Access the Zone Calibration Page and enter
this measured value as the Zone 2 Actual value, with 400° as the Zone 2 Displayed
value.

Zone 1 can be adjusted using the same method at a lower temperature. The instrument
will then create a linear offset based on the Zone1 and Zone 2 Actual temperature
values. Note that the oven does not have to be heated to adjust the zone parameters if
the zone values are known based on prior experience.

38

Sensor Calibration Page

The Sensor Calibration Page has parameters which can change the internal calibration
of the temperature sensor input signal. There is a low and high calibration point for both
the control sensor and the high limit sensor. To calibrate the instrument, allow the
control to warm up for at least 30 minutes.

To access the Sensor Calibration Page, enter the Setup Mode (see description earlier in
this manual). Press the Page key until Control Sensor is displayed. Press the Menu
key.

The control may have the optional process value retransmission output feature. The
output is a 1 to 5VDC signal. To calibrate the retransmit signal, the RetOutLo and
RetOutHi values from the Control Page must be known. You may bypass calibrating
the control and high limit sensor input to access only the retransmit calibration by
pressing the Menu key until RetCalLo is displayed (skip steps 4-17).

To re-calibrate the instrument:

1. Disconnect the control and high limit sensor thermocouples.

2. Connect a calibration instrument with a type J thermocouple output to the

control sensor input. Allow the control to warm up at least 30 minutes.

3. Access Setup Mode.

4. Press Page key until -100F is displayed.

5. Press Menu key until Ctrl Sens -100F is displayed.

6. With Ctrl Sens -100F displayed, adjust the calibration instrument to Type J

thermocouple, -100 degrees Fahrenheit output.

7. Wait 30 seconds. Press the key.

8. With Ctrl Sens 1400F displayed, adjust the calibration instrument to 1400

degrees Fahrenheit output (Type J thermocouple).

9. Wait 30 seconds. Press the key.

10. When the control displays Ctrl Sens Done, disconnect the calibration

instrument from the control sensor input and connect it to the high limit sensor
input. Reconnect the control sensor thermocouple.

11. Press the Menu key until HL Sens -100F is displayed.

12. With the control displaying HL Sens -100F, adjust the calibration instrument

to -100 degrees Fahrenheit output (Type J thermocouple).

13. Wait 30 seconds. Press the key.

14. With the control displaying HL Sens 1400F, adjust the calibration instrument

to 1400 degrees Fahrenheit output (Type J thermocouple).

15. Wait 30 seconds. Press the key.

16. When the control displays HL Sens Done, disconnect the calibration

instrument from the high limit sensor input. Re-connect the high limit sensor
thermocouple.

17. To skip calibration of the retransmit signal, press the Page key twice to exit the

Sensor Calibration Page.

18. To calibrate the retransmit signal, press the Menu key until RetCalLo is

displayed.

39

19. Connect a calibration instrument with a type J thermocouple output to the

Menu Item

Display

Description

Range

Control Sensor
Cal

Ctrl Sens -100F
Ctrl Sens 1400F
Ctrl Sens Done

Calibrate Sensor Low End
Calibrate Sensor High End
Control Sensor Cal Complete

-100 to 1400°F

-100 to 1400°F
(read only)

HiLim Sensor
Cal

HL Sens -100F
HL Sens 1400F
HL Sens Done

Calibrate HiLim Sensor Low
End
Calibrate HiLim Sensor High
End
HiLim Sensor Cal Complete

-100 to 1400°F

-100 to 1400°F
(read only)

Retransmit Cal

RetCalLo XXXX *
RetCalHi XXXX *

Calibrate Retransmit Output
Low
Calibrate Retransmit Output
High

0 to 4096**
0 to 4096***

control sensor input.

20. Connect a voltage measurement device to the retransmit output terminals.

21. Set the calibration instrument output to the temperature value of the RetOutLo

parameter from the Control Page.

22. Adjust the RetCalLo * value using the keys until the voltage measurement

device reads 1VDC.

23. Press the Menu key.

24. Set the calibration instrument output to the temperature value of the RetOutHi

parameter from the Control Page.

25. Adjust the RetCalHi * value using the keys until the voltage measurement

device reads 5VDC.

26. Press the Menu key.

27. Press the Page key to exit the Sensor Calibration Page.

28. Calibration is now complete. Disconnect the calibration instrument and voltage

measurement device (if used).

29. Verify that the control and high limit sensor thermocouples are connected.

*Note that the actual RetCalLo and RetCalHi values displayed are of no importance.

40

Enable Page

Menu Item

Display

Description

Range

Profiles

Enable Profile
1-8

Controls access to Program Page

Yes or No

Autostart

Enable Auto
Start

Controls access to AutoStart
Page

Yes or No **

PID

Enable PID

Controls access to PID Page

Yes or No

Control

Enable Control

Controls access to Control Page

Yes or No

Communication

Enable
Communication

Controls access to
Communication Page

Yes or No **

Real Time
Clock

Enable Clock

Controls access to Real Time
Clock Page

Yes or No **

Relay outputs

Enable Relay
1-4

Controls access to Relay Page

Yes or No **

Test

Enable Test

Controls access to Test Page

Yes or No

Zone
Calibration

Enable Zone
Cal

Controls access to Zone
Calibration Page

Yes or No

Sensor
Calibration

Enable Sensor
Cal

Controls access to Sensor
Calibration Page

Yes or No

Setpoint lower
limit

Enable
SPLowerLim

Sets minimum setpoint allowed

-73°C to 759°C (-100°F to 1399°F)

Setpoint upper
limit

Enable
SPUpperLim

Sets maximum setpoint allowed

-73°C to 760°C (-100°F to 1400°F)

High limit
overhead

Enable
HiLimOH

Sets maximum high limit setpoint
allowed*

3 to 11°C (5 to 20°F)*

Password level
1

Enable
Password 1

Sets password for access level 1

0 to 999

Password level
2

Enable
Password 2

Sets password for access level 2

0 to 999

Setpoint
Change

Enable
SPChange

Set to DISABLE to lock out
setpoint and high limit setpoint
changes in Manual and Timer
Modes

Yes or No
Analog Output

Type

Enable Analog
Type

Sets Analog Output type

Ctrl or Proc

The Enable Page controls access to the other Setup Pages. The setpoint minimum and
maximum values, and the security passwords are also set on the Enable Page.
To access the Enable Page, enter the Setup Mode using a level 2 access code (see
description earlier in this manual). Press the Page key until Enable is displayed. Press
the Menu key. Each parameter can be changed by pressing the Menu key until the
desired parameter is displayed, and then pressing the keys to change the value.

NOTE: Changing the enable to “yes” for each page will allow access to the page in

Level 1 security.

* Maximum high limit setpoint = SPUpperLim + HiLimOH
** If the controller does not have this feature, “No” is the only option.

41

Digital Inputs (optional)

Input 1

Input 2

Input 3

Profile Selected

ON

OFF

OFF

1

OFF

ON

OFF

2

ON

ON

OFF

3

OFF

OFF

ON

4

ON

OFF

ON

5

OFF

ON

ON

6

ON

ON

ON

7

OFF

OFF

OFF

none

The Protocol Plus control can be run by external inputs wired to the control from an
external source such as a PLC or control panel switches. The external run operation
can Run, Hold or Stop profiles 1 through 7 (profile 8 can not be operated externally).
Refer to the table below for the inputs required for the desired operation. NOTE: A
profile must be created in the program page before trying to run a profile number.

To start the selected profile, set Input 1, 2, 3 or 4 to ON.
To hold a profile, set Input 4 to OFF.
To stop a profile, set all inputs to OFF.

Digital Inputs

42

Error Messages and Alarms

The Alarm Status Hi-limit LED is flashing. This indicates a problem with the
thermocouple, or the Hi-limit setpoint has been exceeded. Once the problem has
corrected, press the Reset pushbutton.

The Alarm Status Soak LED is flashing. This indicates that the oven temperature has
not entered or dropped out of the soak band and the soak timer has stopped.

The top LED Display reads OPEN and the lower LCD display reads CONTROL SENS
ERR. This indicates that the Control thermocouple is disconnected or broken. Repair
or replace the thermocouple.

The lower LCD display reads HI-LIM SENS ERR. This indicates that the Hi-limit
thermocouple is disconnected or broken. Repair or replace the thermocouple.

The lower LCD display reads HIGH LIMIT ALARM. This indicates that the Hi-limit
temperature setpoint has been exceeded. Determine if the setting is set too close to the
setpoint, the SSR is defective, or the calibration is incorrect.

Note: The lower LCD display intermittently reads HL Temp. This is not an error
message, but the Hi-limit thermocouple temperature reading.

43

Quick Reference and Default Values

Menu Item

Display

Default

Range

Setting

Ramp Time Seg 1

Pro-1 Seg-1 Ramp Time

00:00

00m00s to
99h59s

Event 1 Set Value

Pro-1 Seg-1 Ramp Event 1

Off

Off, On

Event 2 Set Value

Pro-1 Seg-1 Ramp Event 2

Off

Off, On

Event 3 Set Value

Pro-1 Seg-1 Ramp Event 3

Off

Off, On

Event 4 Set Value

Pro-1 Seg-1 Ramp Event 4

Off

Off, On

Soak Temp Seg 1

Pro-1 Seg 1 Soak Temp

68°F

SPLowerLim to
SPUpperLim *

Soak Time Seg 1

Pro-1 Seg 1 Soak Time

00:00

00m00s to
99h59s

Event 1 Set Value

Pro-1 Seg-1 Soak Event 1

Off

Off, On

Event 2 Set Value

Pro-1 Seg-1 Soak Event 2

Off

Off, On

Event 3 Set Value

Pro-1 Seg-1 Soak Event 3

Off

Off, On

Event 4 Set Value

Pro-1 Seg-1 Soak Event 4

Off

Off, On

(repeat for segments 2-8)

High Limit Setpoint

Pro-1 Hi-Lim SP

Max
HiLimSP

MinHiLimSP to
MaxHiLimSP *,
Band **

Loop From

Pro-1 Loop From XX

No

No, Seg-1 to
Seg-8

Loop To

Pro-1 Loop To XX

No

No, Seg-1 to
Seg-8

Loop Count

Pro-1 Loop Number

0

0 to 99

Profile Link

Pro-1 Link To XX

Stop

Standby***,
Stop, Hold,
Pro-1 to Pro-8

Guaranteed Soak

Pro-1 Guar Band

Off

Off, 1 to 778°C
(1400°F)

(repeat for profiles 2-8)

Program Page

* See Enable Page
** Band value is set on Control Page

*** If Standby

1. Cycle Complete LED indication goes ON.

2. Controller beeps if End Of Cycle beep is enabled.

3. Heater/control output keeps controlling oven temperature at last Soak setpoint.

4. All events programmed (if relay cards installed and programmed as an event) for
the last Soak Segment stays active.

44

Programming Table

Seg-

ment

Ramp

Soak

Time

Events

Temp-

erature

Time

Events

1 2 3 4 1 2 3

4

1

2

3

4

5

6

7

8

High Limit Setpoint

Loop From Seg

Loop To Seg

Loop Number

Link To Pro

Guar Soak Band

Profile Number__________
Profile Name__________

45

Autostart

Menu Item

Display

Default

Range

Setting

Enable Autostart

Auto Start Enable

No

No, Yes

Sunday mode

Auto Start Sun Mode

Off

Off, Manual, Timer, Pro-1 to
Pro-8

Sunday time

Auto Start Sun Time

00:00

00:00 to 23:59

Monday mode

Auto Start Mon Mode

Off

Off, Manual, Timer, Pro-1 to
Pro-8

Monday time

Auto Start Mon Time

00:00

00:00 to 23:59

Tuesday mode

Auto Start Tue Mode

Off

Off, Manual, Timer, Pro-1 to
Pro-8

Tuesday time

Auto Start Tue Time

00:00

00:00 to 23:59

Wednesday
mode

Auto Start Wed Mode

Off

Off, Manual, Timer, Pro-1 to
Pro-8

Wednesday time

Auto Start Wed Time

00:00

00:00 to 23:59

Thursday mode

Auto Start Thu Mode

Off

Off, Manual, Timer, Pro-1 to
Pro-8

Thursday time

Auto Start Thu Time

00:00

00:00 to 23:59

Friday mode

Auto Start Fri Mode

Off

Off, Manual, Timer, Pro-1 to
Pro-8

Friday time

Auto Start Fri Time

00:00

00:00 to 23:59

Saturday mode

Auto Start Sat Mode

Off

Off, Manual, Timer, Pro-1 to
Pro-8

Saturday time

Auto Start Sat Time

00:00

00:00 to 23:59
Menu Item

Display

Default

Range

Setting

Display units

PID Temp Unit

°C

°C or °F

Proportional band

PID Prop Band

6°C

1 to 56°C (1 to 100°F)

Integral reset

PID Reset

2

0 to 100 seconds/repeat

Derivative Rate

PID Rate

0

0 to 500 seconds

AutoTune

PID AutoTune

Disable

Disable, Enable

PID

46

Control

Menu Item

Display

Default

Range

Setting

Cycle Time

Control Cycle Time

1

1 to 60 seconds

High limit setpoint

Control Hi-Lim SP

Max HiLimSP

MinHiLimSP - MaxHiLimSP*

High limit band

Control Hi-Lim Band

Off

Off, 3°C to 11°C (5°F to 20°F)

Power fail recovery

Control PwrFRec

Stop

Stop, Restart, Hold, Resume

Recovery time limit

Control PwrFTime

00m00s

00m00s to 99m59s

Powerup start enable

Control EPwrStrt

Dis

Dis, En

Powerup Start Mode

Control StrtMode

Off

Off, Manual, Timer, Pro-1 to Pro-8

Hysteresis

Control Hyst

3°C

1°C to 56°C (1°F to 100°F)

Process out low

Control RetOutLo

80°C

-73°C to 760°C (-100°F to 1400°F)

Process out high

Control RetOutHi

400°C

-73°C to 760°C (-100°F to 1400°F)

Time scale

Control TimeScale

hh:mm

hh:mm or mm:ss

Key press beep

Control KeyBeep

On

On or Off

End of cycle beep

Control EOCBeep

Off

On or Off

Alarm beep

Control AlarmBeep

Off

On or Off

Menu Item

Display

Default

Range

Setting

Address

Communication CommAddr

1

1 to 247

Mode

Communication CommMode

OFF

OFF, Modbus

Baud rate

Communication Baud Rate

19.2K

2400, 4800, 9600,

19.2K, 38.4K

Parity

Communication Parity

None

None, Odd, Even

*see Enable Page
Communication (optional)

47

Real Time Clock

Menu Item

Display

Default

Range

Setting

Day of the week

Clock Day

Mon

Sun, Mon, Tue,
Wed, Thu, Fri, Sat

Time of day

Clock HH:MM

00:00

00:00 to 23:59

Reset clock

Clock UP to Reset CLK*

Ready

Ready, Done

Menu Item

Display

Default

Range

Type of relay

Relay 1 RelayType

Off

Off, Alarm, Cycl, Ev1 to Ev4

Action of relay

Relay 1 RelayAction

NDE

NDE, NE, NDEL, NEL*****

Type of alarm*

Relay 1 AlarmType

High

High, Low, Plus, Minus, Band

Alarm setpoint*

Relay 1 AlmHi/Lo SP

538°C

-73°C to 760°C (-100°F to 1400°F)

Alarm deviation*

Relay 1 AlmDevBand

3°C

1 to 56°C (1 to 100°F)

Inhibit alarm*

Relay 1 ALMInhibit

On

En or Dis

Type of event**

Relay 1 EventType

Time

Time or Temp

Event setpoint ***

Relay 1 Event SP

SPUpLim

SPLoLim to SPUpLim****

Relay

Type

Action

Alarm/
Event Type

Setpoint

Alarm
Deviation

Alarm
Inhibit

* if the key is not pressed, the clock values will retain their original values, the display
will change to Done if the clock is reset

Relay Outputs (optional)
Push Select key to select relay. If Relay 0 appears, no relays are installed

(repeat for relay outputs 2-4, if available)
* appears only for alarm types

** appears only for time or temperature event types
*** appears only for temperature event types
**** see enable page
***** Normally de-energized and non-latching, normally energized and non-latching,

normally de-energized and latching, normally energized and latching

Table of Settings

48

Test

Menu Item

Display

Default

Range

Setting

Heater output

Test HeatOut

Off

On

High limit relay

Test HiLimOut

Off

On Relay 1 output

Test Rly1 Out

Off

On

Relay 2 output

Test Rly2 Out

Off

On

Relay 3 output

Test Rly3 Out

Off

On Relay 4 output

Test Rly4 Out

Off

On

High Limit Sensor

Test HL Temp

(sensor reading)

Menu Item

Display

Default

Range

Setting

Zone 1 actual

Zone Cal Zone1Act

38°C

-73°C to 760°C (-100°F to
1400°F)

Zone1 displayed

Zone Cal Zone1Dis

38°C

-73°C to 760°C (-100°F to
1400°F)

Zone 2 actual

Zone Cal Zone2Act

260°C

-73°C to 760°C (-100°F to
1400°F)

Zone2 displayed

Zone Cal Zone2Dis

260°C

-73°C to 760°C (-100°F to
1400°F)

Factory calibration*

Zone Cal FactCal

Ready

Ready or Done (push- key)

Menu Item

Display

Default

Range

Setting

Control Sensor Cal

Ctrl Sens 0F
Ctrl Sens 1000F
Ctrl Sens Done

-100°F
1400°F
Done

-100 to 1400°F

-100 to 1400°F
(read only)

HiLim Sensor Cal

HL Sens 0F
HL Sens 1000F
HL Sens Done

-100°F
1400°F
Done

-100 to 1400°F

-100 to 1400°F
(read only)

Retransmit Cal

RetCalLo XXXX *
RetCalHi XXXX *

0
4096

0 to 4096**
0 to 4096***

Zone Cal

*only use when no calibration instrument is available

Sensor Cal

* note that the actual RetCalLo and RetCalHi values displayed are of no

importance.
** press keys until retransmission output = 1VDC
*** press keys until retransmission output = 5VDC

49

Enable Page

Menu Item

Display

Default

Range

Setting

Profiles

Enable Profile 1-8

Yes

Yes or No

Autostart

Enable Auto Start

No

Yes or No **

PID

Enable PID

Yes

Yes or No

Control

Enable Control

No

Yes or No

Communication

Enable Communication

No

Yes or No **

Real Time Clock

Enable Clock

No

Yes or No **

Relay outputs

Enable Relay 1-4

No

Yes or No **

Test

Enable Test

No

Yes or No

Zone Calibration

Enable Zone Cal

No

Yes or No

Sensor Calibration

Enable Sensor Cal

No

Yes or No

Setpoint lower limit

Enable SPLowerLim

20°C

-73°C to 759°C (-100°F to
1399°F)

Setpoint upper limit

Enable SPUpperLim

260°C

-73°C to 760°C (-100°F to
1400°F)

High limit overhead

Enable HiLimOH

5°C

3 to 11°C (5 to 20°F)*

Password level 1

Enable Password 1

1

0 to 999

Password level 2

Enable Password 2

2

0 to 999

Manual/Timer mode
setpoint change

Enable SPChange

Yes

Yes or No

Analog Output Type

Enable Analog Type

Proc

Ctrl or Proc

* Maximum high limit setpoint (MaxHiLimSP) = SPUpperLim + HiLimOH
Minimum high limit setpoint (MinHiLimSP) = SPLowerLim + HiLimOH

** If the controller does not have this feature, “No” is the only option.

50

Technical Specifications

UL, cUL listed:

UL file E136675

CE compliance to:

EMC Directive 89-366/EEC
European Standard EN55011/1991
European Standard EN50082-2/1995

Power supply:

100 to 240 VAC +10% -15%, 50-60Hz, 30VA Maximum
12 to 24 VAC/VDC +/-10%, DC to 60Hz, 30VA Maximum

Temperature:

Storage -20 to 60°C
Operating 0 to 50°C

Humidity:

90% or less, non-condensing

Sensor inputs:

Type J thermocouple -73°C to 760°C (-100°F to 1400°F)
Input impedance 1M ohm or greater
Common mode noise rejection of 140db@60Hz
Common mode input voltage of +/-12.0VDC
Sample rate of at least 1 sample per second
Stability of +/- 0.5°C per 5°C change in ambient temperature
Repeatability of +/- 0.5°C, or +/-0.1% of sensed temperature (whichever is

greater)
Accuracy (@ 77°F +/-0.2 percent of span (+/-3°F)
Supply Voltage Influence of +/-0.5°C per 10% change in nominal line voltage

Temperature
display:

1 degree resolution (C or F)
Accuracy after calibration of +/- 1°C, or +/-0.2% of sensed temperature

(whichever is greater) @25°C
Four-digit seven-segment LCD, 0.43 inches high (11mm)
Readout Stability (+/-1°F/10°F Change in ambient temperature)

Message display:

Two-line, 16 alpha-numeric 5x7 dot matrix characters per line

0.2 inches high (5mm)

Time base:

+/- 4 seconds accuracy in 24 hours

Heat control
output:

SSR Drive 24VDC nominal @ 70mA

Relay output: (plug-in
module)

Form A dry contact, rated 3 amps @ 24-264VAC

Retransmit output:

1 to 5 VDC into > 100K ohm load

Communications:
(plug-in module)

RS232 Single drop, isolated
RS422 Multi-drop, isolated
RS485 Multi-drop, isolated

Remote inputs:
(plug-in module)

Dry-contact closure type with less than 250 ohm ON resistance

Front panel:

NEMA 4X (with gasket)

Dimensions:

3.57H x 7.24W x 2.84D inches (91H x 184W x 72D mm)

Panel opening:

3.63H x 7.30W inches (92H x 185W mm)

51

Maintenance

Do not attempt any service on this oven before opening the main power disconnect
switch.

Checklist

Keep equipment clean. Gradual dirt accumulation retards air flow. A dirty oven

can result in unsatisfactory operation such as unbalanced temperature in the
work chamber, reduced heating capacity, reduced production, overheated
components, etc. Keep the walls, floor and ceiling of the oven work chamber
free of dirt and dust. Floating dust or accumulated dirt may produce unsatis­factory work results. Keep all equipment accessible. Do not permit other
materials to be stored or piled against it.

Protect controls against excessive heat. This is particularly true of controls,

motors or other equipment containing electronic components. Temperatures
greater than 51.5 C (125 F) should be avoided.

Establish maintenance & checkup schedules. Do this promptly and follow the

schedules faithfully. Careful operation and maintenance will be more than paid
for in continuous, safe and economical operation.

Maintain equipment in good repair. Make repairs immediately. Delays may be

costly in added expense for labor and materials and in prolonged shut down.

Practice safety. Make it a prime policy to know what you are doing before you do

it. Make CAUTION, PATIENCE, and GOOD JUDGEMENT the safety
watchwords for the operation of your oven.

Lubrication, Fan motor bearings are permanently lubricated. All door latches,

hinges, door operating mechanisms, bearing or wear surfaces should be
lubricated to ensure easy operation.

52

Tests

Tests should be performed carefully and regularly. The safety of personnel as well as
the condition of equipment may depend upon the proper operation of any one of the
functions of the temperature control. Test the control every 40 hours. Check that the
heater LED is cycling on and off, indicating that the heater is working. Also check the
high limit function to make sure it is working properly.

To test the high limit:

1. Go to Manual Mode and enter control setpoint value at least 20°F (11°C) lower
than the current process temperature.

2. Press the Menu key and lower the high limit setpoint to a value just below the
current process temperature.

3. The high limit alarm indicator should flash and a high limit alarm message should
be displayed. Verify that the heater relay has been disabled by checking that
2LED on the control panel circuit board is not lit.

4. Return the control setpoint and high limit setpoint values to their original values.

5. Press the Reset key.

The airflow switch and purge timer should also be tested every 40 hours.
To test the airflow switch and purge timer:

1. Allow the oven to stabilize at its minimum operating temperature by turning the
heater off. Place all dampers in the closed position.

2. Cycle power to the system.

3. The airflow switch should be closed but the heater relay should remain de­energized until the purge timer times out. This can be verified by monitoring the
purge timer.

On the LFD1-42: Indicators 1LED and 2LED should be lit. 3LED should remain off until
the purge timer times out.

On the LFD2-11 and 2-24: The purge timer can be visually inspected to determine its
state. The contacts can be seen to close when it energizes.

53

Replacement

WARNING:

Disconnect the main power switch or power cord before attempting any repair or adjustment.

Parts

To order or return parts, contact the Service Products Division at Despatch. The
Service Products features our Response Center for customer service. When returning
parts, a Despatch representative will provide you with an MRA (Material Return
Authorization) number. The MRA number must be attached to the returned part for
identification. When you are ordering parts, be sure to give the model number, serial
number and the part number. This will expedite the process of obtaining a replacement
part.

When you have a service need, contact the Response Center at 1-800-473-7373: FAX
612-781-5353.

54

Protocol Plus™ Instrument

(Tools needed: 1/4" socket driver with #1 bit, #2 Phillips screwdriver)

1. Disconnect the power.

2. Remove the screws from the control panel and slide it forward.

3. Unplug all terminals on the rear of the control, noting the proper connections.

4. Remove the four retaining clips for the control.

5. Remove the control.

6. Insert the new control into the panel.

7. Fasten the four retaining clips.

8. Re-plug all terminals.

9. Fasten the control panel.

Heater Unit

(Tools needed: 3/8" wrench, square recess driver with #1 bit for LFD1-42, one-quarter
inch socket set for LFD2-11 and LFD2-24)

1. Remove the chamber floor plate.

a. Remove the screws from the floor plate.
b. Lift the floor plate out of the oven.

2. Disconnect the heater leads from heater element with wrench. Note which wires
go on which terminals.

3. Unscrew the screws holding the heater frame to the oven body.

4. Remove the heater and discard.

5. Screw down the new heater frame.

6. Attach the heater leads to appropriate terminals.

7. Replace the interior floor and screws.

55

Fan Motor

(Tools needed: Screwdriver, 5/32 inch Allen wrench, one quarter (¼) inch socket set)

1. Remove the chamber floor plate.

a. Remove the screws from the floor plate.
b. Lift the floor plate out of the oven.

2. Remove the left side wall.

3. Remove the fan inlet plate.

4. Loosen the set screws (2) on fan wheel in middle of oven bottom. You can
reach the fan wheel by going through the heater or by disconnecting and
removing the heater. Refer to the Heater Unit instructions.

5. Place the oven on its back (LFD1-42 only).

6. Remove the bottom plate on the LFD1-42, or remove the control panel on the
LFD2-11 and 2-24. This will reveal the fan motor.

7. Remove the fan motor.

a. Unscrew the screws (4) holding motor mounts to the body.
b. Disconnect the motor leads from the terminal strip on the power panel.
c. Lift the fan motor from the oven body.

After the fan wheel has run at temperature for awhile, it will stick to the shaft.
Some force may be required to separate the fan wheel from the fan motor shaft.

8. Take the motor mounts off old motor.

9. Put the motor mounts onto new motor.

10. Replace the fan motor.

a. Insert the shaft into shaft collar. Put the fan wheel onto shaft from inside

oven.

b. Reattach the motor mounts to the oven body, making sure grommets are

in place.

56

c. Reattach the motor lead wires to the terminal strip.

11. Replace the oven bottom (LFD1-42) or control panel front (LFD2-11 or 2-24).

12. Turn the oven right side up.

13. Adjust the fan wheel for 3/16 inch clearance between the wheel and the inlet ring.

14. Tighten the set screws on the fan wheel.

15. Check that the set screws hit the flats machined into the motor shaft.

16. Replace the chamber floor plate.

57

Troubleshooting

Difficulty

Probable Cause

Suggested Remedy

Failure to heat

No power
Burned out heater
Protocol™ malfunction
Loose wire connections

Purge timer not timed out or
failed

Heater relay failure
Airflow switch not closed

Door switch failure

Check power source and/or oven and wall fuses.
Replace heater (see warranty.)
Replace controller.
Disconnect power and check connections behind

control panel.
Wait 3 minutes. If still not heating, replace purge

timer.
Replace circuit board.
Check exhaust system for proper operation and

ventilation. If airflow switch still does not close,
replace switch.

Replace door switch.

Slow heat up

Improperly loaded
Low line voltage

Heating element(s) are
burned out

240 volt oven is connected to
a 208V line (LFD1-42 only)

Fan motor failure

Reduce load or redistribute load in chamber.
Supply sufficient power and proper connections.

Check for circuit overload.
Replace burned out element (see warranty

statement.)
Raise line voltage to a 240 volt line or modify oven

for 208V operation (consult factory).
Replace fan motor.

Frequent heater
element out

Harmful fumes generated by
load

Spillage or splattering of
material on heater elements

Overheating oven

Increase vent opening or discontinue process.

Disconnect power and clean oven chamber and
elements.

Check the Hi-limit.

Erratic temp. or
inaccurate temp.

Protocol™ malfunction
Improper tuning parameters
Protocol™ miscalibration

Hi-limit setting
Improper offset

Replace Protocol™.
Check tuning parameters.
Recalibrate Protocol™ (see section on Calibration

mode.)
Hi-limit should be 10-25°C higher than setpoint.
Check zone calibration.

Equipment which operates for long periods of time may develop problems. Below are
possible problems and suggested solutions. If you have a problem not listed and do not
know what to do, contact Despatch Industries at our toll free Help Line 800-473-7373.

58

Difficulty

Probable Cause

Suggested Remedy

Excess surface
or door temp.

Door seal deterioration

Replace door seal.

Improper airflow

Fan motor failure
Fan wheel seated too low on

fan shaft
Unbalanced fan wheel

Replace fan motor.
Adjust fan wheel for 3/16" clearance between

wheel and inlet ring.
Replace fan wheel.

Excessive
vibration

Dirty fan wheel
Unbalanced fan wheel

Clean fan.
Replace fan wheel.

Oven will not
control at
setpoint

Hi-limit set too low
Protocol malfunction
SSR malfunction

Air friction of recirculation fan

Set the Hi-limit higher
Replace control.
Replace SSR and/or check control output voltage.
Open exhaust air vent. Unit will not control below

minimum operating temperature with vent closed.

Heater does not
shut down until
temp. reaches
the Hi-limit
setting

Protocol malfunction
SSR malfunction

Replace Protocol
Replace SSR

NOTE: The circuit board mounted on the control panel has three status LED indicators
to help troubleshoot if the oven is not heating (LFD1-42 only).

A. If LED 1 is not lit, check 2F and 3F (control fuses), or power switch.
B. If LED 1 and LED 3 are lit but not LED 2, check high limit (and optional door

switch, if installed).

C. If all three LEDs are lit, check 1F and 4F (heater fuses), SSR, heater, and heater

relays.

59

APPENDIX
Temperature Scale Conversion (C/F)

The Protocol Plus controller can be operated in either C or F. The default setting for the
controller is C. Changing from one to the other is as follows:

1. Go into the Setup Mode on the controller.

2. Press the Select Key until Setup is displayed.

3. Press the Page key and Security will be displayed.

4. Press the Menu Key and Password will be displayed. Use the arrow keys to
enter the proper password. The default password is 2 for level two.

5. Once the proper password is displayed, press the Page key until PID is
displayed.

6. Press the Menu key and Temp Unit along with C or F will be displayed. Use the
arrow keys to change the setting.

7. Once the proper setting is displayed, press and hold the Page key for
approximately three seconds to exit the Setup Mode.

60

Optional MRC5000 Recorder Setup

Parameter Code

Degrees C

Degrees F

Inps

17

17

Icor 0 0

diSP

On

On

dPOS

0

0

EUU **

400

752

EUL **

0

32

ChUP

400

800 *

ChLO

0

0

DFF

1

1

The temperature is retransmitted to the Recorder from the Controller. Set up the
Recorder as follows:

1. Make sure that jumper JU1 is setup for the 5 VDC setting (see MRC Manual).

2. Move the Mode switch to the PROG/TEST/CAL position, and Prog will be
displayed.

3. Press the down arrow key twice and Inps will be displayed. Make sure the
settings are per the table below.

4. Once all the settings have been changed, move the Mode switch to the RUN
position. The display on both the Recorder and controller should read the same.

* Note: The 0 - 400 chart paper must be changed to the 0 - 800 chart paper. Depending on the

equipment, 0 - 600 paper can be used if the maximum temperature is 500 degrees F.

** Note: These values must mach the setting sRetOutLo and RetOutHi on the Control page on the

Protocol Plus controller (example: RetOutLo is 32, then EUL must read 32).