Watlow 945 User Manual
Series 945
User’s Manual
TOTAL
CUSTOMER
SATISFACTION
3 Year Warranty
1/4 DIN
Microprocessor-Based
Auto-tuning Control
Watlow Controls
1241 Bundy Blvd., P.O. Box 5580, Winona, Minnesota USA 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507
0600-0017-0000 Rev A
August, 1994
Supersedes without change: W945-MA40-9432
$10.00
Made in the U.S.A.
Recycled Paper At Least 10% Postconsumer Waste
Contents
Starting Out
Page Item
Chapter 1
3 Starting Out With The Watlow Series 945
3 General Description
Chapter 2
4 How To Install And Wire The Series 945
4 Installation Procedure
4 Dimensional Information
5 Wiring the Series 945
5 Sensor Installation Guidelines
6 Input Wiring
7 Output 1 Wiring
8 Output 2 Wiring
9 Alarm Wiring
10 Retransmit Wiring
11 System Wiring Examples
Chapter 3
12 How To Use The Keys And Displays
12 Series 945 Keys and Displays
Chapter 4
13 How To Setup The Series 945
13 How to Set the DIP Switch
13 Entering Setup Menu
14 Setup Parameters
17 Setup Menu Table
18 Operation Parameters
20 Operation Menu Table
Chapter 5
21 How To Tune And Operate
21 Auto-tuning
22 Manual Tuning
23 Manual and Automatic Operation
24 Changing the Position of an Alarms Jumper
25 Using Alarms
26 Error Code Messages
27 Error Code Actions
28 Appendix 1
28 Noise Sources
28 Decreasing Noise Sensitivity
29 Eliminating Noise
30 Checking For Ground Loops
30 Noise Suppression Devices Available…
31 Line Filtering Configurations For Controls
32 Appendix 2
32 Entering the Calibration Menu
33 Restoring Factory Calibration
35 Calibration Procedures
39 Glossary
41 Index
42 Specifications
43 Model Number Information
43 Returns
43 Warranty
Notes
Informational notes alert you to important details. When
you see a note icon, look for an explanation in the margin.
or
Safety Information
Boldface safety information protects both you and your
equipment. Please be attentive to them. Here are
explanations:
The WARNING symbol in the wide text column alerts you
to a "WARNING," a safety hazard which could affect you
and the equipment. A full explanation is in the narrow
column on the outside of the page.
ç
The CAUTION symbol in the wide text column alerts you to
a "CAUTION," a safety or functional hazard which could
affect your equipment or its performance. A full explanation is in the narrow column on the outside of the page.
Technical Assistance
If you encounter a problem with your Watlow control,
review all of your configuration information to verify that
your selections are consistent with your application...
Inputs, Outputs, Alarms, Limits, etc. If the problem persists
after checking the above, you can get technical assistance
by dialing: 1-507-454-5300
An Application Engineer will discuss your problem with you.
Please have the following information available:
• Complete model number • Serial Number
• All configuration information • User's Manual
The model and serial numbers can be found on the outside
of the case.
Your Feedback
Your comments or suggestions on this manual are welcome, please send them to: Technical Writer, Watlow
Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN
55987-5580, or phone 507/454-5300. The Watlow Series
945 User's Manual and integral software are copyrighted
by Watlow Winona, Inc., © 1989, with all rights reserved.
blr0392
2
WATLOW Series 945 User's Manual
How to Use the Manual
Chapter 1
The Watlow Series 945,
A Microprocessor-Based Control
Starting Out
Starting Out
Single Input Type J, K, T, N, R, S, B, C or Pt2
Thermocouple, RTD or Process
Remote Set
Point Input 0-5VDC or 4-20mA
RS-422A, RS423A (RS-232C
compatible), or EIA-485
Optional Computer Interface
Retransmit Output
Process Set Point
Output 1
Auto-tuning
(Heat only)
Dual Outputs -
PID or ON/OFF, User Selectable
Output 1 Heat or Cool
Output 2 Heat, Cool or None
Dual Alarms
(Up to 10 Slaves)
Output 1 or 2
Percent Power
Figure 1 Series 945 Input and
Output Overview
General Description
Welcome to the Watlow Series 945, a 1/4 DIN microprocessor-based temperature
control. It has a single input, remote set point input, dual output, and dual alarm.
The 945 is an auto-tuning control when Output 1 is in the heat mode, and features
Automatic/Manual capability with bumpless transfer. In the Auto mode, the 945 has
closed loop control with sensory feedback, while the Manual mode has open loop
control with user defined output power level. The 945 accepts a variety of thermocouples, as shown above, along with RTD, or process input. The primary output is
heat or cool, while the secondary output can be heat, cool or none. An optional
retransmit output is offered in place of one of the alarms. Selectable as retransmit
of set point or process variable. Units with communications feature data logging
with user selectable table, chart or SPC (Statistical Process Control) printout of data.
With the Series 945 you can select either PID or ON/OFF for Output 1 or 2. Input a
complete set of PID parameters for both outputs, including proportional band, reset/
integral and rate/derivative. By setting either output's proportional band to zero, the
Series 945 becomes a simple ON/OFF control with the switching differential selectable under the HYS (hysteresis) parameter in the Setup menu.
Operator-friendly features include automatic LED indicators to aid in monitoring and
setup, as well as a calibration offset at the front panel. The Watlow Series 945
automatically stores all information in a non-volatile memory.
Getting Started, Chapter 1
WATLOW Series 945 User's Manual
3
Installation
Chapter 2
How to Install and Wire the Series 945
1. Make a panel cutout per the dimensions given below. Your panel thickness can
be from 0.06" to 0.25" (1.52 to 6.35 mm).
3.62" to 3.65" sq.
(92 to 92.25 mm)
0.92"
(23 mm)
6.0"
(152 mm)
Figure 2 Series 945
Panel Cutout and
Unit Dimensions
Figure 3 How to Open the
Series 945.
Panel
Cutout
3.63" X 3.63"
(92.08 X 92.08 mm)
Bezel 0.17" sq.
Dimension (4 mm)
2. Remove the 945 from its case by turning the front panel screw 90° counterclockwise (CCW). Grip the bezel firmly and pull the control out of the case.
3.8" sq.
(97 mm)
3.6" ± 0.015"
(90 mm ± 0.381)
!
LOCK
!
CAUTION:
The front panel
screw turns 90°
only. Do not apply
excessive force or
turn the screw more
than 90°.
Figure 4 Mounting the
Series 945 Case.
4
WATLOW Series 945 User's Manual
3. Place the case in the cutout you just made. Attach the two mounting brackets,
shipped with your unit, either to the top and bottom, or to both sides of the unit.
Tighten the brackets securely against your panel.
Panel
Mounting Bracket
4. Insert the control chassis into its case and press the bezel to seat it. Turn the
front panel screw 90° clockwise (CW) to lock the control in place.
Install and Wire, Chapter 2
How to Wire the Series 945
The Series 945 wiring is illustrated by model number option. Check the terminal
designation sticker on the control and compare your model number to those shown
here and also the model number breakdown on the inside back cover of this manual.
Series 945 internal circuits appear "inside" the line drawing of the 945, while
connections and terminal designations appear "outside" the line drawing. All
outputs are referenced to a de-energized state. The final wiring figure is a typical
system example.
When you apply power without a sensorinput on the terminal strip, the 945
displays "- - - -" in the upper display, and "0" in the lower display. Press AUTO/
MAN twice, and ER 7 is displayed for one second. This error indicates an open
sensor or A/D error. Remove power to the control and connect the sensor properly,
see Page 6. All wiring and fusing must conform to the National Electric Code and
to any locally applicable codes as well.
Power Wiring
Fuse
11
12
13
120 VAC
10
Fuses
12
13
240 VAC
L1
L2
Earth Ground
L1
L2
Earth Ground
Sensor Installation Guidelines
We suggest you mount the sensor at a location in your process or system where it
reads an average temperature. Choose a point that will adequately represent the
process temperature without being overly reactive.
For thermocouple inputs: Use an isolated or ungrounded thermocouple if an
external 4-20mA output device with a non-isolated circuit common is connected.
Extension wire must be of the same alloy as the thermocouple itself to limit errors.
Figure 5 120 VAC Power
Wiring
Figure 6 240 VAC Power
Wiring
WARNING:
To avoid potential
electric shock, use
National Electric
Code (NEC) safety
practices when
wiring and connecting this unit to a
power source and to
electrical sensors or
peripheral devices.
For RTD inputs: There could be a +2°F input error for every 1 of lead length
resistance when using a 2 wire RTD. That resistance, when added to the RTD
element resistance, will result in erroneous input to the instrument. To overcome
this problem, use a 3 wire RTD sensor, which compensates for lead length resistance. When extension wire is used for a 3-wire RTD, all wires must have the
same electrical resistance (i.e. same gauge, copper stranded).
For 0-5VDC or 4-20mA process inputs: The rL and rH settings scale the display
to match the measured range of the process signal. For 0-5VDC process input, the
impedance is 100KΩ. For 4-20mA process input, the impedance is 249Ω.
Install and Wire, Chapter 2
WATLOW Series 945 User's Manual
5
Input Wiring
Thermocouple Input
Figure 7 Thermocouple
Input Wiring
Figure 8 2 or 3 wire RTD
Input Wiring.
945A - 1 _ _ _ - _ 000
945A - 2 _ _ _ - _ 000
945A - 3 _ _ _ - _ 000
945A - 4 _ _ _ - _ 000
7
9
+
-
(-) = Red
RTD, 2 or 3 Wire
Jumper #5 to #6
for 2 Wire RTD
945A - 2 _ _ _ - _ 000
945A - 3 _ _ _ - _ 000
4
5
6
These input connections are also used in conjunction with T/C and RTD
sensor types when using the remote set point input.
4
5
6
Figure 9 0 - 5 VDC Process
Input Wiring.
Figure 10 4-20mA Process
Input Wiring.
0 - 5VDC Process or Remote Set Point Input
+
1
V
DC
Input impedance: 100KΩ
945A - 2 _ _ _ - _ 000
945A - 3 _ _ _ - _ 000
3
-
4 - 20mA Process or Remote Set Point Input
+
DC
I
4-20mA process input: 249Ω.
-
945A - 2 _ _ _ - _ 000
945A - 3 _ _ _ - _ 000
1
2
3
A jumper must be
installed between
Terminal #2 and 3.
WATLOW Series 945 User's Manual
6
Install and Wire, Chapter 2
Output 1 - Solid State Relay With Contact Suppression
945A - _ B _ _ - _ 000
Suppression
Off state impedance: 31MΩ max.
Off state impedance: 20K max.
17
18
N.O.
COM.
External
Load
Fuse
Output 1 - Switched DC Output (Open Collector)
Output 1 Wiring
Figure 11 Solid State Relay
With Contact
Suppression
L2
L1
Figure 12 Switched DC
(Open Collector)
945A - _ C _ _ - _ 000
Switched DC, Open Collector,
Non-Isolated
-
+
Logic
Switch
-
+
16
17
Output 1 - Mechanical Relay, 6 Amp, Form C
945A - _ D _ _ - _ 000
Mechanical Relay, Form C, 6 Amp
COM.
16
N.O.
17
18
N.C.
Off state impedance: 20KΩ min.
External
Output 1 - Process, 4 - 20mA
Fuse
Load
External
Load
L1
L2
NOTE:
Minimum load
resistance is 500 .
Available current is
22mA maximum.
Typical voltage drop
across a 1K load is
12 to 19 volts.
Figure 13 6 Amp Mechanical
Relay
NOTE:
This output is
supplied with an arc
suppression snubber
across the output
terminals. High
impedance loads may
remain energized
even though the
output device is
turned OFF.
945A - _ F _ _ - _ 000
Process, 4-20 mA, Non-Isolated
Load impedance: 600Ω max.
Install and Wire, Chapter 2
IDC
Figure 14 Process, 4-20mA
+
-
17
18
+
External
-
Load
WATLOW Series 945 User's Manual
7
Output 1 & 2 Wiring
Figure 15 Process, 0 - 5VDC
Figure 16 Solid State Relay
Without Contact
Suppression
Figure 17 Solid State Relay
With Contact
Suppression
Output 1 - Solid State Relay Without Contact Suppression
Solid State Relay, Form A, 0.5 Amp
Off state impedance: 31MΩ max.
Output 2 - Solid State Relay With Contact Suppression
Output 1 - Process, 0 - 5VDC
945A - _ H _ _ - _ 000
Load impedance: 10KΩ min.
945A - _ K _ _ - _ 000
17
++
-
External
Load
External
Load
Fuse
L2
L1
17
18
18
N.O.
COM.
-
NOTE:
This output is supplied
with an arc suppression
snubber across the
output terminals. High
impedance loads may
remain energized even
though the output device
is turned OFF.
NOTE:
Minimum load resistance is 500
current is 22mA
maximum. Typical
voltage drop across a
1K
Ω load is 12 to 19
volts.
Figure 18 Switched DC Output
(Open Collector)
WATLOW Series 945 User's Manual
8
Ω. Available
Output 2 - Switched DC Output (Open Collector)
945A - _ _ B _ - _ 000
Suppression
Off state impedance: 20KΩ max.
Switched DC, Open Collector,
945A - _ _ C _ - _ 000
Load impedance: 10KΩ min.
Non-Isolated
Logic
Switch
14
15
14
15
N.O.
COM.
+
-
Fuse
L1
L2
External
Load
External
Load
Install and Wire, Chapter 2
Output 2 - Mechanical Relay, 6 Amp, Form A
Output 2 & Alarms
945A - _ _ D _ - _ 000
Suppression
Off state impedance: 20KΩ min.
14
15
N.O.
COM.
External
Load
Fuse
Output 2 - Solid State Relay Without Contact Suppression
945A - _ _ K _ - _ 000
Solid State Relay, Form A, 0.5 Amp
Off state impedance: 31MΩ max.
14
15
N.O.
COM.
Fuse
L1
L2
External
Load
L2
L1
Figure 19 6 Amp Mechanical
Relay
NOTE:
This output is
supplied with an arc
suppression snubber
across the output
terminals. High
impedance loads may
remain energized
even though the
output device is
turned OFF.
Figure 20 Solid State Relay
Without Contact
Suppression
For more information on alarms and alarm jumper selection,
see Chapter 5.
Alarm Output - Mechanical Relay, 6 Amp, Single Form A or B
945A- _ _ _ 1 - _ 000
Suppression
Output #3
Off state impedance: 20KΩ min.
26
27
Fuse
Load
L1
L2
Alarm Output - Mechanical Relay, 6 Amp, Dual Form A or B
945A- _ _ _ 2 - _ 000
Output #4
Output #3
Off state impedance: 20KΩ min.
Install and Wire, Chapter 2
Suppression
24
25
26
27
Fuse
Load
Fuse
Load
WATLOW Series 945 User's Manual
L1
L2
L1
L2
Figure 21 Alarms
Option 1 Wiring.
Figure 22 Alarms
Option 2 Wiring.
9
Alarm/Retransmit
Mechanical Relay, 6 Amp, Form A or B/0 - 5VDC Retransmit
Figure 23 Alarm/Retransmit
Option 3 Wiring.
NOTE:
This output is supplied with an arc
suppression snubber
across the output
terminals. High
impedance loads may
remain energized
even though the
output device is
turned OFF.
Load impedance: 10KΩ min. for 0-5VDC. Relay offstate impedance: 20KΩ.
Mechanical Relay, 6 Amp, Form A or B/4 - 20mA Retransmit
945A- _ _ _ 3 - _ 000
External
+
-
+
24
25
26
27
Fuse
Load
Load
L1
L2
Figure 24 Alarm/Retransmit
Option 4 Wiring.
Figure 25 Retransmit
Option 5 Wiring.
945A- _ _ _ 4 - _ 000
-
IDC
+
Load impedance: 10K min. for 4-20mA. Relay offstate impedance: 20K .
24
25
26
27
-
+
Fuse
Load
External
Load
L1
L2
0 - 5VDC Retransmit Output
Process, 0-5VDC non-isolated
945A- _ _ _ 5 - _ 000
-
+
Load impedance: 10KΩ min.
24
25
External
+
Load
4 - 20mA Retransmit Output
Figure 26 Retransmit
Option 6 Wiring.
WATLOW Series 945 User's Manual
10
945A- _ _ _ 6 - _ 000
IDC
Load impedance: 600Ω max.
-
+
24
25
-
+
External
Load
Install and Wire, Chapter 2
WARNING:
M
1CR
Series 945
Temperature
Control
Hg
1
L1
11
L2
12
2
7
9
16
4
5
17
1 2
1 2
1
2
1 2
(+)
(-)
3
6
8
15
16
Heater
1CR-1 2CR-1
Hg
17 18
L1 L2
7
9
10
TC (+)
TC (-)
11
12
945A-2DD0-A000
140A-1601-6000
N.O.
N.C.
2
2CR
13
Hi Temp. Light
1
2
3
4
5
6
7
8
9
10
11
12
Series 140
Limit
Control
Reset
COM
R
COM
All wiring and fusing must conform to the National Electric Code NFPA70 and to
any locally applicable codes. Contact your local board for additional information.
Failure to observe NEC safety guidelines could result in injury to personnel.
ç
CAUTION:
Watlow mercury relays are designed to be used only with resistive loads.
L1
120 VAC
L2
Wiring Example
Figure 27 System Wiring
Example
Earth Ground
945A-2DD0-A000
Rear View
(+)
7
(-)
9
Red
945A-2DD0-A000
Terminal Function
11
12
13
16
17
Fuse
Ground
CO
N.O.
Mercury
Relay for
Control
Process Sensor
140A-16XX-6000
High Limit Control
Normally Open
Momentary
Switch
(-)
(+)
High Limit
Mechanical
Contactor
Coil
Limit Sensor
ç
Heater
1 4-20, 0-5 +
2 4-20, Jumper to 3
3 4-20, 0-5 4 S1
5 S2
6 S3
7 T.C. +
8 Not Used
Install and Wire, Chapter 2
9 T.C. 10 L1 240V
11 L1 120V
12 L2
13 Earth Ground
14 N.O.
15 Com.
16 Com.
17 N.O.
18 N.C.
Output #2
Output #1
WATLOW Series 945 User's Manual
11
Keys/Displays
Figure 28 Series 945
Keys and Displays.
Chapter 3
How to Use the Keys and Displays
After 1 minute with no key activations, the control reverts to the process value in the
upper display and the set point in the lower display.
Upper Display
Red, 0.56" (14 mm) high,
seven segment, four digit
LED display, indicating
either process actual
temperature, the operating
parameter values, or an
open sensor. When powering up, the Process display
will be blank for 8 seconds.
L 1 & L2
When lit, these LED's
tell you when Output 1
or Output 2 is energized. L2 only appears
if your unit has the #2
output hardware.
MODE Key
Steps the control
through the Operating
menu; also, in the Auto
mode, enters new data
selected.
UP Key
Increases the value of
the displayed parameter. A single touch increases the value by
one. Hold the key
down to increase the
value at a rapid rate.
New data is self entering in 5 seconds.
DOWN Key
Decreases the value of
the displayed parameter. A single touch decreases the value by
one. Hold the key down
to decrease the value
at a rapid rate. New
data is self entering in 5
seconds.
Lower Display
Red 0.56" (14 mm) high, seven
segment, four digit LED
display, indicating the set
point, operation parameters,
menu parameters, and error
or alarm codes.
A1 & A2
When lit, these LEDs tell you
when Alarms 1 or 2 are active.
Only appears on those units
with alarms option.
AUTO/MAN Key
Pressed once, it clears any
latched alarms. If the key is
pressed again within 5
seconds, the control toggles
between the Auto and Manual
mode. While in the Manual
mode, percent power is always
displayed in the lower display.
Front Panel
Locking Screw
Secures or releases
the control chassis
from its case.
12
WATLOW Series 945 User's Manual
UP/DOWN keys
When pressed simultaneously for 3 seconds, the
Setup Menu appears displaying the LOC
parameter. At the LOC parameter, continue to
press the UP/DOWN keys simultaneously , and
the Calibration Menu will appear.
Auto/Manual LED
Lit when the control is in
Manual operation. Press the
key twice to enter Auto operation. A blinking Auto/Manual
LED indicates that pressing
the AUTO/MAN key toggles
between Auto and Manual.
After 5 seconds without pressing the AUTO/MAN key, the
LED stops blinking, and returns to its previous state.
Keys and Displays, Chapter 3
Chapter 4
How To Setup The Series 945
Setting up the Series 945 is a simple process. First configure the 945's features to
your application in the Setup Menu, and then enter values in the Operating Menu.
Use the MODE key to move through the menus and the UP/DOWN keys to select
data.
At this point, enter the Calibration menu by pressing the UP/DOWN keys simultaneously for 3 seconds. Selecting US or SI under the dFL parameter determines the
following: If selected as US, rate, reset, °F and proportional band in degrees will
appear. If selected as SI, integral, derivative, °C and proportional band in % of span
will appear. See Appendix II to change this parameter.
How to Set the DIP Switch
The Watlow Series 945 has a Dual In-line Package (DIP) switch inside the control on
the A007-1954 circuit board (middle board). The location of the board and switches
appear below. The switches are clearly numbered. When Switch #1 is ON, the Setup
parameters can be viewed but not changed. Switch #2 is not used. The factory
default is OFF.
A007-1954
Setup
Hardware Lockout of
1
SETUP Parameters
2
Not Used
Battery Discharge for
Storage
(Factory default is OFF)
Control Chassis - Top View
Entering the Setup Menu
Enter the Setup Menu by pressing the UP/DOWN keys simultaneously for 3 seconds.
The lower display shows the LOC parameter, and the upper display shows its current
level. All keys are inactive until you release both keys. You can reach the LOC
parameter from anywhere.
You will not see all parameters in this menu, depending on the unit's configuration and
model number. After stepping through the menu it returns to the control set point
parameter under the Operation menu.
Figure 29 DIP Switch Location
and Orientation
Figure 30 Entering the
Setup Menu
Setup, Chapter 4
WATLOW Series 945 User's Manual
13
Setup Menu
t
2
e
h
l
4
Figure 31 The Setup Menu
NOTE:
The rL and rH
parameters are used
to scale the display
for process inputs,
and/or will scale the
retransmit range for
process output. rL
and rH also limit the
range of the set
point.
LOC
In
rSP
dEC
C _ F
rL
rH
Ot 1
HYS1
Ot 2
HYS2
AL 1
LAt1
HYS3
Ot4
AL 2
LAt2
75
[Set Point]
User lock out
( )
Input type
( )
Remote set point
( )
( )
Decimal place
( )
Celcius_Fahrenhei
( )
Range low
( )
Range high
( )
Output 1
( )
Hysteresis 1
( )
Output 2
( )
Hysteresis 2
( )
Alarm 1
( )
Latching for alarm 1
( )
Hysteresis 3
( )
Output
( )
Alarm 2
( )
Latching for alarm
= Parameter may or may not appear
depending on control configuration.
M
= Only appear if your unit has com-
munications. See the Series 945
data communications manual for more
information on these parameters.
( )
HYS4
SIL
rtd
bAUd
dAtA
Prot
Addr
Log
LSL
USL
tbS
LinE
YEAr
Mon
dAY
HOUr
Min
Int
tAg
Hysteresis 4
( )
Silence alarm
( )
RTD calibration curve
( )
Baud rate
( )
Data bits and parity
( )
Protocol type
( )
Address
( )
Logging printout
( )
Lower spec limit
( )
Upper spec limit
( )
Time base
( )
Lines per pag
( )
Current year
( )
Current mont
( )
Current day
( )
Real time hour
( )
Real time minutes
( )
Time interva
( )
Variables to transmit
14
Setup Parameters
When you are at the top of the menu, the Series 945 displays the user level of
operation in the upper display, and the LOC parameter in the lower display.
Press the MODE key and the value of the next parameter appears in the upper
display, the prompt appears in the lower display. For units with process input, see
the L-r parameter on Page 20 for how LOC is affected.
LOC
WATLOW Series 945 User's Manual
Lock: Selects the level of operator lockout. Range: 0 - 3 Default: 0
LOC 0: All operating parameters may be viewed or changed. Manual operation is
permitted. Bumpless transfer to manual operation can occur on sensor break.
LOC 1: The set point, actual, and L-r (if rSP is enabled) are the only visible parameters,
set point is adjustable in this level. Manual operation is permitted. Bumpless
transfer to manual operation can occur on sensor break.
LOC 2: The set point, actual, and L-r (if rSP is enabled) are the only visible parameters,
set point is adjustable in this level. Manual operation is not permitted.
Bumpless transfer is defeated, outputs are disabled on sensor break.
LOC 3: The set point and actual are the only visible parameters, set point is not
adjustable in this level of lockout. Manual operation is not permitted. Bumpless
transfer is defeated, outputs are disabled on sensor break.
Setup, Chapter 4
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