CSZ EZT-550 User manual

EZT-550 Controller
Instruction Manual
56121 REV B
8-05

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TABLE OF CONTENTS
1. Overview ................................................................................................................................. 4
1.1 Menu Bar Function Tree.......................................................................................................4
1.2 Touch Screen Interface ........................................................................................................ 6
2. Monitoring ................................................................................................................................. 7
2.1 Chamber Monitor .................................................................................................................. 7
2.2 Chamber Detail..................................................................................................................... 8
2.3 Trend Graph ......................................................................................................................... 9
2.4 Graphic Monitor .................................................................................................................. 10
2.5 System Alarms.................................................................................................................... 10
2.6 Profile Status View.............................................................................................................. 11
3. Single Setpoint Operation......................................................................................................... 13
3.1 Single Setpoint Adjustment ................................................................................................13
3.2 Event Control (Chamber On/Off) ........................................................................................ 14
3.2.1 Chamber Options................................................................................................... 15
4. Profile Operation........................................................................................................................ 17
4.1 Profile Create/Edit............................................................................................................... 17
4.2 Guaranteed Soak Limits ..................................................................................................... 21
4.3 Plot Profile .......................................................................................................................... 22
4.4 Start/Stop Profile................................................................................................................. 23
4.4.1 Hold/Resume a Profile........................................................................................... 24
4.4.2 Advance Previous/Next Step................................................................................. 24
5. Chamber Setup .......................................................................................................................... 25
5.1 Control Tuning .................................................................................................................... 25
5.1.1 How to Adjust Tuning Parameters......................................................................... 27
5.2 Device Under Test (DUT) ................................................................................................... 28
5.3 Event Tag Names ............................................................................................................... 29
5.4 Power Recovery .................................................................................................................30
5.5 Timer Setup ........................................................................................................................ 31
5.6 Defrost Settings .................................................................................................................. 33
6. Datalogging ............................................................................................................................... 34
6.1 Start/Stop Datalogging........................................................................................................ 34
6.2 View Log File ...................................................................................................................... 35
6.2.1 Deleting Log Files.................................................................................................. 38
7. System Maintenance ................................................................................................................. 39
7.1 Set Date/Time..................................................................................................................... 40
7.2 Level 1 (User) Security Options.......................................................................................... 41
7.2.1 Degrees C/F Selection .......................................................................................... 41
7.2.2 Maintenance Counters .......................................................................................... 42
7.2.3 Calibration.............................................................................................................. 43
7.3 Factory Security Options ....................................................................................................50
7.3.1 Setpoint Limits ....................................................................................................... 50
7.3.2 Startup Configuration............................................................................................. 50
8. File Access ............................................................................................................................... 51
8.1 Opening Files...................................................................................................................... 51

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9. Communications........................................................................................................................ 53
9.1 Connecting a Computer to the EZT-550............................................................................. 53
9.1.1 RS-232 Serial Connection .....................................................................................53
9.2 Maintenance Protocol ......................................................................................................... 54
9.2.1 Write Data Command ............................................................................................ 55
9.2.2 Read Data Command............................................................................................ 57
9.2.3 BCC Block Check Calculation ............................................................................... 58
9.3 EZT-550 Operands .............................................................................................................59
9.3.1 Profile Area Operands ........................................................................................... 63

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Introduction
This manual has been tailored to match the specific features and options provided on the ZP(H) Series
chambers. Do not use this manual in an attempt to operate or maintain any other model chamber. It is highly
recommended that the end user read this manual thoroughly and understand all aspects of the chamber’s
operation prior to operating the chamber.
WARNING Warnings identify any condition or practice that, if not strictly observed, could result in
serious personal injury or possible loss of life.
CAUTION Cautions identify any condition or practice that, if not strictly observed, could result in
damage to, or destruction of, the system equipment.
Device Under Test (DUT) Protection
The chamber is equipped with high heat limits and/or safety devices. These devices are installed to protect the
chamber from exceeding design limits. These devices remove power from the chamber’s heaters ONLY and DO
NOT remove power from the device under test.
Provisions must be made by the end user to de-energize the tested device in the event of an over-temperature
condition. For this reason, the chamber is equipped with a DUT safety relay that should be connected to the
device’s power supply control circuit. In the event of an over-temperature condition, the relay will open and de-
energize the device under test to prevent a runaway thermal condition. See section 5.2 for more information on
the use of this safety feature.
Screen Displays
The graphic displays shown in this manual are based on ZPH Series chamber with the humidity option. Screens
displayed on temperature only chambers (ZP Series) will differ slightly from those shown. The temperature only
models will not include values or settings for humidity.

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1. Overview
The EZT-550 Controller is a not just another graphic interface for operating and monitoring the chamber. It is an
intelligent device that monitors and protects the chamber from adverse operating conditions. It does this without
the need for user intervention or knowledge on system operation. The displays provide the user with an intuitive
interface for navigating through the different menus and settings without having to go multiple levels deep in
screens like other “button style” systems. The EZT-550 provides a “Windows” like feel with drop down menus
and online help at all times. This section of the manual provides an overview of the menu items and structure.
1.1 Menu Bar Function Tree
The menu structure for the EZT-550 is as shown below:
Main Menu
Views: Chamber Monitor
Chamber Detail
Chamber Trend
Graphic Monitor
System Alarms
Profile: Edit/Monito
r
Views: Chamber Monitor
Profile Status
Profile Entry
Guaranteed Soak
Plot Profile
Edit: New profile
Insert/Delete Step
Copy/Paste Step
Select Profile
Save(as) Profile
Delete Profile
Run: Run profile
Hold Profile
Stop Profile
Advance Step

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Views: Chamber Monito
r
Data: Start/Stop Logging
Open Log File
Historical Trend
Li
g
ht: Li
g
ht On/Off
Hel
p
: Dis
p
la
y
S
p
ecific
Setup: Control Tuning
DUT Settings
Event Tagnames
Power Recovery
Timer Setup
Defrost Settings
System Maintenance
Setu
p
: Chambe
r
S
y
stem Maintenance Views: Chamber Setu
p
Setup: Degrees C/F
Maintenance Counters
Password Entry
Setpoint Limits
Set Date/Time
Startup Configuration
Calibration: Analog Input 1
Analog Input 2
Analog Input 3
Analog Input 4
Analog Out 1
Analog Out 2

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1.2 Touch Screen Interface
The EZT-550 display is divided into three main sections; the menu bar, main display area and detail window.
Menu Bar: The menu bar is used to navigate through the various monitoring and control screens.
Main Display Area: The main display area contains the active items for the menu item selected.
Detail Window: The detail window provides display specific information.
To select items on the display, simply touch the desired text or numerical entry item. Do not use any sharp or
metal objects on the touch screen as they will damage the interface. For detailed information regarding the
different screen elements, see the following sections.
Menu Bar
Detail Window
Main Display
Area

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2. Monitoring
The chamber monitoring screens provide various means of verifying chamber operation and performance. The
displays are accessed from the main menu under “Views”.
2.1 Chamber Monitor
The monitor screen displays the current setpoints and process variables. The setpoints can be modified from
this screen by touching the setpoint field box. Upon pressing the setpoint field box, the pop-up numeric entry
pad will appear from which the setpoint can be entered. However, if a profile is running or the timer is enabled,
the setpoint fields are locked out from user adjustment.
Process Variables
Setpoints

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2.2 Chamber Detail
The chamber detail screen includes additional operating parameters beyond the setpoint and process variables
shown on the monitor screen. The chamber events can be activated or de-activated from this screen and their
current status can be monitored. As on the monitor screen, the setpoints can also be changed from the detail
screen when a profile is not active and the timer is disabled.
Special Fields Description
Out%
The output field shows the amount of heating or cooling (humidifying or dehumidifying) that is being done
expressed in terms of percent. The display range is from –100 to 100% representing full cooling to full heating
for example. A reading of zero means that no cooling or heating is being performed.
Event Table
The events are used to control specific chamber functions and optional customer relays. Not all events are used
with the ZP(H) Series chamber and are marked as such. The scroll bar to the right of the list box allows the user
to view each event through the list.
Next to each event is a check box and indicator light. The check box indicates which events are selected to turn
on. The indicator light next to each event shows the status of that event. A green light indicates that the event is
on while a dark indicator represents an off status.
Percent Output
Event Table
Scroll bar

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2.3 Trend Graph
The trend graph displays the setpoint and process variable history over a period of time. The vertical axis
determines the range of displayed data while the horizontal axis determines the sample period. The maximum
time period allowable is 4 hours.
Trend Configuration
To adjust the displayed variables, range and sampling period, touch the “Trend Setup” button. The Trend Setup
screen will appear with the available adjustment controls.
Trend Zero
The zero value sets the minimum range of the vertical access for the trend variables.
Trend Span
The span value sets the maximum range of the vertical access for the trend variables.
Time(Mins)
The time interval is in minutes and adjusts the displayed time period for the trend. The allowable range is from
10 to 240 minutes.

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Trend Points
To adjust what items are shown on the trend, select/deselect the desired items by touching the check box next to
each process and setpoint variable.
Once all selections are made, press the “Done” or “Cancel” button to return to the trend screen. Any
adjustments made when the “Cancel” button is pressed will be disregarded.
2.4 Graphic Monitor
The graphic monitor displays the process variables using graphic symbols, i.e. thermometer for temperature for
example. The range of the thermometer can be changed by touching the thermometer. Low and high range
adjustment boxes appear at the bottom of the screen. After changing the range(s), touch the thermometer again
to accept the changes. The adjustment boxes will close and the thermometer range will be updated.
2.5 System Alarms

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The alarm screen displays any current and previously silenced alarms according to time and date of occurrence.
When an alarm occurs, the screen background will turn red to notify the user of a new alarm. Once the alarm is
silenced, the screen background will revert to the standard blue background.
Silence
The silence button acknowledges the current active alarms and silences the audible alert.
Clear
The clear button removes all alarms from the alarm list. If an alarm is still currently active, the alarm will return.
Only non-active alarms can be cleared.
2.6 Profile Status View
The profile status view contains information on the current profile in operation. It is accessed under the profile
sub-menu. To view the screen from the main menu, select Profile, Edit/Monitor, Views, Profile Status View.
1) Profile Name
Displays the name of the profile being run.
2) Current Profile Status
Displays the current operating status of the selected profile.
3) Temp
Displays the current temperature inside the chamber.
4) TempSP
Indicates the current target temperature of the step being run.
5) %RH
Displays the current relative humidity level inside the chamber.
6) %RHSP
Indicates the current target humidity level of the step being run.
7) Current Step
Indicates the step number currently being executed.
8) Last Step
Indicates the last step number of the selected profile in operation.
1
2
3
4
6
5
7
8
9
10
11
12
13

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9) Step Time Remaining
Displays the time left within the current step in hours and minutes. A time of 1 minute indicates a
time remaining of less than 1 minute
10) Profile Time Remaining
Displays the time left within the profile in hours and minutes. This includes jump steps and
recycles.
11) Time Running
Displays the total time the profile has ran in hours and minutes. This includes total step times and
time spent in hold.
12) Cur Recycle Step
Indicates the current step number that the profile will jump to when the current step is complete and
when recycle count (see below) is greater than 0. A step number of 0 indicates that no jump will
take place.
13) Recycle Steps Left
Indicates how many jumps are left from the current step. When the recycle count is 0, no jump
takes place and the next sequential step number is executed.

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3. Single Setpoint Operation
This chapter explains how to operate the chamber in its basic operating mode.
3.1 Single Setpoint Adjustment
To adjust the setpoint:
1) Select either the Chamber Monitor or Chamber Detail screen under the Views menu.
2) Input the setpoint temperature (humidity).
Press the setpoint (SP) field box for temperature and/or humidity. The setpoint adjust keypad will
pop up on the screen. Enter the desired setpoint value and press the Done button.
3) Turn the Chamber event on, see section 3.2 below.

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3.2 Event Control (Chamber On/Off)
To turn chamber systems and optional customer events on/off:
1) Select the Chamber Detail screen under the Views menu.
2) Select the events you wish to turn on by checking the check box next to each event in the list box.
To turn off events, de-select the check box next to the event.
3) Press the Update button to set the new event status. Note that the events will not turn on or off
until the update button is pressed.
Chamber On/Off
Turns the chamber’s air circulators, heating and cooling systems on and off.
Humidity On/Off
Turns the chamber’s humidity system components on and off. When humidity is turned off, the relative humidity
is still measured and displayed; however, no control takes place to obtain the target setpoint.
NOTES on humidity system operation
Temperature Extremes
When operating your environmental chamber at extreme air temperature setpoints, below freezing (0°C / 32°F)
or above boiling (100°C / 212°F), the chamber is not capable of controlling humidity. This is due to the physical
properties of air and its ability to hold moisture at standard atmospheric pressures when at the extreme
temperatures.
To prevent malfunction or damage to the chamber, the EZT-550 control system automatically disables the
humidity system components when outside of the valid operating temperature range. The event will remain on;
however, once the air temperature within the chamber returns to valid operating temperatures, humidity control
will resume at the target setpoint.
On/Off Status
Indicato
r
Check Box

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Minimum Humidity Limitations
The standard humidity option provides a lower limit on humidity control relating to a 4.4°C (40°F) dewpoint. The
dewpoint refers to the temperature at which the air contains the maximum amount of moisture it can hold. When
a surface drops to that temperature or below, condensation can occur. The dewpoint varies logarithmically with
temperature and relative humidity. This means that at higher temperatures, a lower humidity level can be
obtained because the air can hold more moisture the warmer it becomes.
For example, an air temperature of 85°C (185°F) and relative humidity of 12%, is the equivalent dewpoint of air
at a temperature of 5°C (41°F) and 79%. Both of these values are at the minimum achievable dewpoint of the
chamber, and thus the minimum achievable humidity at the related temperature. If you were to set the humidity
setpoint at 0% for example, the humidity level would never reach 0 since the chamber is not capable of removing
any more moisture from the air.
The EZT-550 is programmed to determine what the minimum achievable humidity point is at any given
temperature and will control to that limit. Therefore, the system will not overwork itself trying to reach an
unattainable point. This prolongs system life and reduces wear and tear on humidity system components. Thus,
if you set a setpoint of 0%, you can be confident that the environment within the chamber will remain as dry as
possible at any given temperature within the operating range.
3.2.1 Chamber Options
The following information covers the use and operation of the optional chamber systems.
Aux Cooling
The auxiliary cooling system utilizes LN2 or CO2 as a boost cooling medium to assist the refrigeration system in
lowering the chamber air temperature. It is an inexpensive method for fast cooling transitions without having to
make the investment in a high horsepower refrigeration system that may rarely be used.
When this option is installed on the chamber, turn the Aux Cooling event on. When the boost is required during
a pulldown, the EZT-550 will turn on the boost cooling solenoids and inject LN2 or CO2, into the chamber to drop
the temperature as fast as possible. Once the setpoint is achieved, the boost solenoids will close in order to
conserve LN2 or CO2 since it is no longer required. To prevent the boost cooling from turning on for normal
testing, turn the Aux Cooling event off.
Dry Air Purge
The dry air purge event has two levels of functionality.
Level 1 - The first level of this option is dry air purge only. The purge only option consists of an air dryer
which dries a small volume of air and discharges the dry air within the chamber. This helps
reduce condensation on surfaces within the chamber by drying the air. When this event is
turned on with the purge only option, the air dryer will run continuously until the event is turned
off.
Level 2 - The second level of this option includes the frozen coil option. This option allows the chamber
to reach a –29°C (-20°F) dewpoint. This relates to lower relative humidity control. When the
frozen coil option is installed and the humidity system is enabled, the dry air purge system is
operated in conjunction with the frozen coil automatically by the EZT-550 controller based on
the air temperature and humidity setpoints. When required to obtain low humidity levels, the
frozen coil and dry air purge systems will start in order to obtain the target setpoint. When no
longer required, they will automatically turn off.
You also get the benefit of being able to manually use the dry air purge system by turning the
purge event on and off. However, in the case where the frozen coil option is installed, the
humidity system must be disabled for the dry air purge to function manually.

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Customer Events
The EZT-550 controller has the ability to control up to 12 event output relays. These outputs can be manually
turned on and off, and they can also be controlled programmatically through a running profile. You can use them
to start and stop devices under test within the chamber, turn signal beacon lights on and off to indicate steps
within the test cycle, etc.
CAUTION The relay outputs are rated for 125Vac and up to 2A of current. To switch high power loads,
the event relay must be used as the “switch” to turn a power contactor on and off to supply
power to the test device.

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4. Profile Operation
This chapter explains how to operate profiles. To access profile utilities, select the Edit/Monitor option under the
Profile menu heading.
4.1 Profile Create/Edit
Profiles are created/edited from the Profile Entry screen located under the Profile menu selection. The following
instructions describe the steps involved for programming profiles.
1) To create a profile, go to the Profile Entry screen. This screen appears by default upon selecting
Edit/Monitor from the main Profile menu.
The profile entry screen can also we selected at any time from the profile Views menu.

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2) From the Edit menu, select New Profile and select “Yes” to create a new profile.
Edit Menu Options
New Profile: Clears any existing profile entry data so that a new profile can be entered.
Insert Step: Inserts a step into the current profile at the current step number.
Delete Step: Deletes the current step.
Copy Step: Copies the current step data.
Paste Step: Pastes previously copied step data to current step.
Select Profile: Opens the file explorer window so that the user can select a profile from the currently
saved profiles.
Save Profile: Saves any changes made to the current profile under the existing name. If no name
exists, the user is prompted to enter one.
Save As: Allows the user to save the current profile to a different name. This is useful for
copying profiles in order to make different versions of the same profile.
Delete Profile: Allows the user to delete the current profile.
Step Scroll Buttons
Moves the display back to the previous step.
Moves the display to the next step.

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4) Input the required step data by touching the field entry boxes. Once touched, the keypad entry screen
will pop-up and allow the desired value to be entered.
Total Steps
The total steps entry is common to all steps of the profile. It specifies the total length of the profile. The
profile can be from 1 to 99 steps in length. This must be set to the correct number of steps in order for
the profile to work correctly.
Step Events
The step events button opens up the events list for the current step. From this window, select the
events that are to be on during the step. Once the selections are complete, return to the step entry
screen.
Note: This must be done for each step individually. Also, for the chamber to operate, the relevant
chamber systems must be turned on via the event entry window. Even though a profile may
be in operation, if the events are not set, the chamber will not run.
TempSP
Target setpoint for air temperature during execution of step.
%RHSP
Target setpoint for humidity during execution of step.
Hrs: and Mins:
Time length of step in hours and minutes. Note that the time of a step can be zero (0). This is useful
for making instant setpoint changes between steps when a ramp is not desired.
Profile Recycle
The profile recycle allows the profile to jump between different steps within itself. This is useful for
repeating the same profile during extended cycle testing of product.
Recycle# - number of times to jump
Recycle Step – number of step to jump to once current step is complete