Watlow 989LF Operating Manual
Series 988LF
1/8 DIN Microprocessor-Based Temperature/Process Controller
0600-0009-0000 Rev C
October 1999
Supersedes: 0600-0009-0000 Rev B
$10.00
Made in the U.S.A.
Printed on Recycled Paper 10% Postconsumer Waste
User’s Manual
Includes 986L, 987L, 988L, and 989L
User Level Targeted:
• New User .............................. go to page i
• Experienced User................... go to page 2.1
• Expert User............................. go to page A.8
Installers:
• Setup ..................................... go to page 4.1
• Wiring & Installation................ go to page 2.1
Watlow Controls
1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580
Phone: (507) 454-5300, Fax: (507) 452-4507 http://www.watlow.com
CUS
CTI
SATISFACTI
96
TOTAL
CUS
TOMER
3 Y ear W arranty
ON
ISO 9001
Registered Company
Winona, Minnesota USA
Introduction to the Watlow Series 988LF
Controllers
ii Using this Manual
ii Document Every Step
iii Notes, Cautions and Warnings
iii Technical Assistance
iii We Value Your Feedback
Chapter 1
Hardware Setup
1.1 Dip Switch Locations and Functions
Chapter 2
Installation and Wiring
2.1 Panel Cutout and Dimensions
2.2 Installing the Series 988LF
2.3 Wiring the Series 988LF
2.3 Input-to-output Isolation
2.3 Power Wiring
2.3 Sensor Installation Guidelines
2.4 Wiring 0-20mA and 4-20mA
Process Inputs
2.5 Wiring Example
2.7 Input 1 Wiring
2.8 Remote Set Point Option Wiring
2.9 Output 1 Wiring
2.10 Output 2 Wiring
Chapter 3
Front Panel and Display Loop
3.1 Keys and Displays
3.2 Display Loop
Chapter 4
The Setup Menus
4.1 Navigating the Setup Menus
4.2 Setup Prompts
Chapter 5
The Operation Menus
5.1 Navigating the Operation Menus
5.2 Display Prompts
Chapter 6
The Factory Menus
6.1 Reaching the Diagnostics Menu
6.5 Reaching the Calibration Menu
Chapter 7
Tuning, Manual Operation,
Alarms and Error Codes
7.1 Auto-tuning (Heat and/or Cool)
7.2 Manual Tuning
7.3 Manual and Automatic Operation
7.4 Using Alarms
7.5 Error Code E1 and E2 Messages
7.6 Error Code Actions
Appendix
A.1 Warranty and Returns
A.2 Glossary
A.4 Index
A.6 Specifications
A.7 Model Number
A.8 Menu Overview
A.9 Declaration of Conformity
Table of Contents
Table of Contents WATLOW Series 988LF User’s Manual
WATLOW Series 988LF User’s Manual i
Introduction
Introduction To The Watlow
Series 988LF Controllers
Figure Int.1 The Series 988LF
Features.
Welcome to the Watlow Series 988LF, a dual output, single input, microprocessor-based, 1/8 DIN, auto-tuning temperature control, featuring
automatic/manual capability with bumpless transfer. In the Auto mode,
the control has closed loop control with sensory feedback, while the
Manual mode has open loop control with user defined output power level.
The 988LF accepts a wide range of thermocouple sensors, along with RTD,
and process inputs. The primary output is Heating or Cooling, while the
secondary output can be Heating, Cooling, or Alarm.
With the Series 988LF, you can select either PID or ON/OFF for output 1
or Output 2. You may input a complete set of PID parameters for both
outputs, or select automatic tuning for both heat and cool from the front
panel. This includes proportional band, reset, rate, and cycle time. By
setting either output’s proportional band to zero, the Series 988LF
becomes a simple ON/OFF control with a 3°F or 1.7°C switching differential, 0.3°F or 0.17°C for 0.1° RTD.
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 988LF automatically stores all information in a nonvolatile memory.
TL
W
W
A
PROCESS
L1 L2
DEV
% OUT
DISPLAY
SERIES 988LF
MODE
AUTO
MAN
Output 1
Control
Heat/Cool
Output 2
Control
Heat/Cool
Alarm
Input 1
Sensor Input
Input 2
Remote Set
Point Option
Auto-Tune
Heat/Cool
Process Deviation
from Set Point
Percent Power
ii WATLOW Series 988LF User’s Manual
Introduction
Introduction
Using this Manual
This manual provides the information you will need to install and operate
a Series 988LF controller.
If you need information about Series 988LF configurations and model
numbers, refer to the Appendix of this manual.
This manual explains the five steps of setting up a Series 988LF controller:
1. Set and document all of the DIP switches, if applicable: Chapter 1.
2. Mount the controller: Chapter 2.
3. Wire and document the controller wiring: Chapter 2.
4. Configure and document the controller software: Chapters 3-6.
5. Run, test and adjust your application. Update documentation.
The Appendix provides definitions and specifications, along with
application examples to help you optimize the safety and performance of your application. Use the Table of Contents and Index to
find specific information.
Document Every Step
The Series 988LF provides powerful control features. Carefully document
each step of the setup and any subsequent changes. This will make it
much easier to change, adjust and troubleshoot your application.
Make the configuration documentation available to engineers and technicians, on all shifts, who may need to work with the Series 988LF. We provide space in this manual to record configurations. You may prefer to
photocopy the blank forms and keep them in a separate binder. However,
you maintain your documentation; be sure to replace all old copies of the
documentation with updated versions whenever the controller configuration is changed.
NOTE:
The Menu Overview
in the Appendix
shows all of the
menus and
prompts.
NOTE:
The 12-digit number
is printed on the top
of the stickers on
each side of the
controller’s case
and on the righthand or top circuit
board.
Introduction
WATLOW Series 988LF User’s Manual iii
Introduction
Notes, Cautions and Warnings
We use note, caution and warning symbols throughout this book to draw
your attention to important operational and safety information.
A bold text “NOTE” marks a short message in the margin to alert you to
an important detail.
A bold text “CAUTION” safety alert appears with information that is
important for protecting your equipment and performance. Be especially
careful to read and follow all cautions that apply to your application.
A bold text “WARNING” safety alert appears with information that is
important for protecting you, others and equipment from damage. Pay
very close attention to all warnings that apply to your application.
The ç symbol (an exclamation point in a triangle) precedes a general
CAUTION or WARNING statement.
The Ó symbol (a lightening bolt in a triangle) precedes an electric shock
hazard CAUTION or WARNING safety statement.
Technical Assistance
If you encounter a problem with your Watlow controller, review all of your
configuration information for each step of the setup to verify that your
selections are consistent with your applications.
If the problem persists, an Application Engineer can discuss your application with you.
Before calling, please have the complete model number and user’s manual
available. You can get technical support by dialing 507/494-5656, 7 a.m.
to 7 p.m. Central Standard Time, or e-mail to wintechsupport@watlow.com.
We Value Your Feedback
Your comments and suggestions on this manual are welcome. Please send
them to, Technical Writer, Watlow Controls, P.O. Box 5580, Winona, MN
55987-5580, or call (507) 454-5300, or fax (507) 452-4507. The Series
988LF User’s Manual is copyrighted by Watlow Winona, Inc., © October
1999, with all rights reserved. (1831)
iv WATLOW Series 988LF User’s Manual
Introduction
Notes
WATLOW Series 988LF User’s Manual 1.1
Hardware Setup, Chapter 1
Chapter 1 Hardware Setup
DIP Switch Locations and Functions
The Watlow Series 988LF has at least one and as many as three dual inline package (DIP) switches inside the controller, depending on the model
number. They allow users to configure the controller for a variety of
input sensors, or to lockout front panel access to some functions.
To set any DIP switch:
• Remove the controller from the case by pressing firmly on the two
release tabs on one side or the top of the bezel until they unsnap. Then
firmly press the two release tabs on the opposite side or the bottom of
the control until they unsnap. You will need to gently rock the bezel
back and forth to release it from the chassis.
• Use the illustrations on the following pages to locate and set each DIP
switch.
Figure 1.1 - Press
the release tabs to
remove the controller chassis.
Release
Tabs
PROCESS
L1 L2
DEV
% OUT
SERIES 988LF
W
A
TL
DISPLAY
AUTO
MODE
MAN
W
Release
Tabs
Release
Tabs
W
A
TL
W
MODE
DSPY
PROCESS
AUTO
DEV
% OUT
L1 L2
MAN
SERIES 989LF
Release
Tabs
1.2 WATLOW Series 988LF User’s Manual
Hardware Setup, Chapter 1
DIP Switches
Figure 1.2 Input DIP switches.
Input 1 Input 2
(Remote Set Point)
(98_L-2___-AA__) (98_L-_2__-AA__)
RTD
thermocouple: R, S or B
thermocouple: J, K, T, N, E, C, D, Pt2
or 0-50mV (high impedance)
0-20 or 4-20mA; 0-5, 1-5 or 0-10V
❶ Set the input DIP
switches to match the sen-
sors you are using in your
application. Only controllers with model number 98_L-2___-AA__ or
98_L-_2__-AA__ have an
input DIP switch.
NOTE:
The Input 2 DIP
switch is mounted
upside down.
NOTE:
Only controllers
with the indicated
model numbers
have these DIP
switches.
Input 2 DIP
ON
Input 1 DIP
ON
Controller Chassis
Rear View
123
O
N
↑
123
O
N
↑
↑
N
O
123
↑
N
O
123
123
O
N
↑
123
O
N
↑
↑
N
O
123
↑
N
O
123
WATLOW Series 988LF User’s Manual 1.3
Hardware Setup, Chapter 1
DIP Switches
Figure 1.3 Lockout DIP switch.
no hardware lockout or
(Switch 1 has no effect.)
lockout Setup and Factory menus or
(Switch 1 has no effect.)
Control Chassis
Top View (986LF & 988LF)
Left-side View (987LF & 989LF)
Lockout
DIP
ON
OFF
❷ The lockout DIP switch
hides the Setup Menu and the
Factory Menus (Diagnostics
and Calibration). All units
have a lockout DIP switch.
ç
CAUTION:
The lockout DIP
switch makes the
Setup and Factory
menus unavailable.
Configure all the
Setup and Factory
menus before locking them out.
Failure to do so
could result in damage to equipment in
the event of a setup
error.
12
O
N
↑
12
O
N
↑
12
O
N
↑
12
O
N
↑
1.4 WATLOW Series 988LF User’s Manual
Hardware Setup, Chapter 1
Notes
WATLOW Series 988LF User’s Manual 2.1
Installation and Wiring, Chapter 2
Chapter 2 Installation and Wiring
Figure 2.1 Series 988LF and
Series 989LF
dimensions.
NOTE:
Adjustable mounting brackets can be
side-mounted.
NOTE:
Space panel
cutouts at least 1.66
inches (42.2mm)
apart.
NOTE:
Holes can be cut in
the panel using a
Greenlee 1/8 DIN
Hydraulic Kit
#60068 (punch
#60069, die #60070).
W
A
TL
PROCESS
L1 L2
DEV
% OUT
SERIES 988LF
(55 mm)
W
2.18"
DISPLAY
AUTO
MAN
MODE
4.03"
(102mm)
W
PROCESS
L1 L2
4.03"
(102mm)
W
A
TL
DSPY
DEV
% OUT
MODE
AUTO
MAN
SERIES 989LF
2.18"
(55 mm)
Panel Cutout
Maximum Panel
Thickness
0.38" (9.65mm)
3.62" + 0.03 -0.00
(92mm + 0.8)
1.77 + 0.02 -0.00
(45mm + 0.6)
0.68"
(17 mm)
Panel
4.06"
(103 mm)
Adjustable
Mounting Bracket
2.2 WATLOW Series 988LF User’s Manual
Installation and Wiring, Chapter 2
Installation
Installing the Series 988LF
Installing and mounting requires access to the back of the panel.
1. Make a panel cutout.
2. To remove the controller chassis from its case, press in firmly on the two
tabs on one side or the top of the bezel until they unsnap, then unsnap
the two tabs on the opposite side or the bottom. Pull the chassis out of
the case by gently rocking it.
3. Slide the case into the panel cutout. Check to see that the gasket is
not twisted, and is seated within the case bezel flush with the panel.
Slide the mounting collar over the back of the control.
Panel
Adjustable
Mounting Bracket
Bezel
External Gasket
Mounting Collar
Release Tabs
Top and Bottom (986LF or 988LF)
or Side (987LF or 989LF) View
Mounting Slots
Side (986LF or 988LF)
or Top and Bottom (987LF or 989LF) View
4. Loosen the mounting bracket screws enough to allow for the mounting
collar and panel thickness. Place each mounting bracket into the
mounting slots (head of the screw facing the back of the controller).
Push each bracket backward then down to secure it to the control
case. To guarantee a proper NEMA 4X seal, Series 986LF and
988LF units (vertical) must have the mounting brackets located on
either side of the unit. When installing Series 987LF and 989LF
units (horizontal) the brackets must be on the top and bottom of
the unit.
5. Make sure the case is seated properly. Tighten the installation screws
firmly against the mounting collar to secure the unit. To ensure a
NEMA 4X seal, there should be no space between the bezel and
panel. Overtightening the screws will distort the case and make it dif-
ficult to remove or replace the controller.
6. Insert the controller chassis into its case and press the bezel until all
four tabs snap. Make sure the inside gasket is seated properly and
not twisted.
7. To release the mounting brackets, loosen the mounting bracket screws
and push the brackets forward, then pull it up and out.
NOTE:
Removing the controller chassis from
its case makes
mounting easier.
Figure 2.2 Side and top view.
ç
CAUTION:
Follow the installation procedure
exactly to guarantee
a proper NEMA 4X
seal. Make sure the
gasket between the
panel and the rim of
the case is not
twisted and is seated properly. Failure
to do so could
result in damage to
equipment.
WATLOW Series 988LF User’s Manual 2.3
Installation and Wiring, Chapter 2
Wiring
Wiring the Series 988LF
Wiring options depend on the model number and DIP switch settings.
Check the terminal designation stickers on either side of the controller
and compare your model number to those shown here and with the model
number breakdown on the inside back cover of this manual.
Input-to-output Isolation
The Series 988LF uses optical isolation between the analog inputs and the
controller outputs. This isolation provides a 500V~ (ac) barrier to prevent
ground loops when using grounded sensors and/or peripheral equipment.
Here is a breakdown of the isolation barriers:
• Analog inputs 1 and 2 are grouped together.
• Outputs 1 and 2 are grouped together.
Power Wiring
100 to 240 V~ (ac), nominal (85 to 264 actual)
Vertical Package 98 8
L - _ _ _ _ - A A _ _
Horizontal Package 98 9 L - _ _ _ _ - A A _ _
24 to 28 V‡‡(ac/dc), nominal (20 to 30 actual)
Vertical Package 98 6
L - _ _ _ _ - A A _ _
Horizontal Package 98 7 L - _ _ _ _ - A A _ _
Sensor Installation Guidelines
Thermocouple input: Extension wire for thermocouples must be of the
same alloy as the thermocouple itself to limit errors.
Using grounded thermocouples for both input 1 and remote set point
option may create ground loop problems. To correct this problem, replace
at least one of the grounded thermocouples with an ungrounded thermocouple. If the application requires grounded thermocouples, use an isolated transmitter, such as a Watlow Gordon 5702 isolated transmitter.
RTD input: Each 1Ω of lead wire resistance can cause a +2°F error when
using a two-wire RTD. A three-wire RTD sensor overcomes this problem.
All three wires must have the same electrical resistance (i.e., same gauge,
same length, multi-stranded or solid, same metal).
Process input: Maintain isolation between input 1 and input 2 to prevent
a ground loop. A ground loop may cause incorrect readings, dashes
across the upper display or the display of error codes.
fuse
22
21
earth ground
11
L2L1
+
-
∫
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. Failure to
do so could result
in injury or death.
Figure 2.3 Power wiring.
ç
CAUTION:
The Series 988LF
will not function
with two grounded
thermocouple
inputs. Avoid using
a grounded thermocouple for both
input 1 and input 2.
Failure to follow this
guideline could
result in damage to
equipment.
Wiring 0-20 and 4-20mA Process Inputs
Certain “transmitters” used in process input applications are producing
internal resistor failures in the Watlow Series 988 family of controllers.
This is only apparent with the Series 988 family 1/8 DIN units with
Process Inputs selected (0-20mA or 4-20mA dc only).
We are noticing that an external resistor is required to prevent a high
in-rush current which burns out the Series 988 family controllers’ 7-ohm
internal resistor. This high in-rush current occurs initially on “power-up.”
If the transmitter turns full on for a split second during power-up, the
available current weakens or damages the internal resistor.
Example: 20V / 7 ohms = 2,857mA (too much!).
The wiring diagram example below shows an application where a customer
is using a 4-20mA dc transmitter and power supply to feed the input of a
Series 988 controller. The Rx range (100 to 400 ohms) for the external
resistor is recommended. We suggest starting with 250 ohms.
Example: Customer is using a 24VÎ (dc) power supply to power up the
4-20mA dc transmitter that inputs to the Series 988 terminals 8 (-) and 10
(+). To figure out what the internal Series 988’s handling current is for the
0-20mA or 4-20mA dc input to the Series 988 controllers, we need to
apply Ohm’s Law: The square root of Watts divided by Resistance equals
Current. Applying that formula to the example below produces the following: Square Root of (0.125 Watts / 7 ohms) = 134 mA dc (handling input
current). This is the acceptable input current for the Series 988 universal
input board.
Reminder, the input impedance of 7 ohms handles the majority of our
customer applications; the external resistor (Rx) is only for certain transducers/transmitters that spike on power-up or power-down. Please make
sure your customer’s transmitter / transducer fall within our Series 988
family (1/8 DIN) of controllers’ Process Input specification of 7 ohms input
impedance.
Figure 2.4 Process wiring
example.
2.4 WATLOW Series 988LF User’s Manual
Wiring
988 Process
Input Control
4-20mA dc
Internal
Resistor
7Ω
1/8 Watt
+
—
R
100 to 400
ohms
x
Transmitter
—
+
+
24VÎ (dc)
Power Supply
—
WATLOW Series 988LF User’s Manual 2.5
Installation and Wiring, Chapter 2
Wiring Example
Figure 2.5 System wiring
example.
∫
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. Failure to
do so could result
in injury or death.
ç
WARNING:
Install high or low
temperature limit
control protection
in systems where
an over temperature fault condition
could present a fire
hazard or other hazard. Failure to
install temperature
limit control protection where a potential hazard exists
could result in damage to equipment,
property and injury
to personnel.
ç
WARNING:
To avoid damage to
property and equipment, and/or injury
of loss of life, use
National Electric
Code (NEC) standard wiring practices to install and
operate the Series
988LF. Failure to do
so could result in
such damage,
and/or injury or
death.
L1
120 VÅ (ac)
L2
earth ground
(+)
9
10
(-)
red
120VÅ (ac)
1
2
3
4
5
6
7
8
9
10
11
12
13
high limit
mechanical
fuse
11
2221
(+)
12
(-)
13
988L-10CA-AARR
rear view
L1
1
1
1 2
1
process sensor limit sensor
3
4
(+)
5
(-)
1 CR-1
8
11
17
coil
contactor
31
+
SSR-240-10A-DC1
solid state relay
-
21 22
9
10
910
12
13
(+)
14
(-)
15
Series 988LF
988L-10CA-AARR
Temperature Control
12 + 13 -
3
3-32VÎ (dc)
(+)
12
48-260VÅ (ac)
13
13
146D-1J1F-1100
14
Temperature Limit
10
11
5
heater
in
out
Series 146
24
4
SSR-240-10A-DC1
Solid State Relay
(-)
7
9
high temperature light
fuse
11
heater
R
18
fuse
C NO NC
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17
(+)
(-)
normally open
momentary switch
1CR
16
optional
high
temp limit
light
Series 146
limit control
146D-1J1F-1100
L2
2
2
2
2
Wiring Notes
ç
WARNING:
To avoid damage to
property and equipment, and/or injury
of loss of life, use
National Electric
Code (NEC) standard wiring practices to install and
operate the Series
988LF. Failure to do
so could result in
such damage,
and/or injury or
death.
Figure 2.6 Wiring notes.
NOTE:
Sketch in your application on this page or
a copy of it. See
wiring examples in
this chapter and in
the Appendix.
2.6 WATLOW Series 988LF User’s Manual
Installation and Wiring, Chapter 2
L1 L2
earth ground
11
21 22
power
WATLOW Series 988LF User’s Manual 2.7
Installation and Wiring, Chapter 2
Figure
2.7c — 0-5V
ÎÎ
, 1-5VÎÎor 0-10VÎÎ(dc) Process
Universal signal conditioner
98 _ L - 2 _ _ _ - A A _ _
Input impedance: 10KΩ
Figure 2.7a — Thermocouple or 0-50mV (high impedance)
Thermocouple only
98 _ L - 1 _ _ _ - A A _ _ (no DIP switches)
Universal signal conditioner
98 _ L - 2 _ _ _ - A A _ _
Input impedance: 20MΩ
Figure 2.7
b — RTD (2 or 3 Wire) 100Ω
Universal signal conditioner
98 _ L - 2 _ _ _ - A A _ _
9
10
+
-
0-50mV
Figure 2.7d — 0-20mA or 4-20mA Process
Universal signal conditioner
98 _ L - 2 _ _ _ - A A _ _
Input impedance: 7Ω
DIP Switch
Setting
R, S, B
DIP Settings
J, K, T, N, C, E, D, Pt2,
0-50mV DIP Settings
DIP Switch
Setting
DIP Switch
Setting
NOTE:
Successful installation requires five
steps:
• Model number and
software choice
(Appendix);
• DIP switch settings (Chapter 1);
• Sensor match
(Chapter 2 and
Appendix);
• Sensor installation
(Chapter 2); and
• Wiring (Chapter 2).
Jumper
#9 to #10
for 2 wire
RTD
Input 1 Wiring
ç
CAUTION:
An external resistor
is required for
0-20mA and 4-20mA
process wiring to
prevent a high inrush current which
could burn out the
controller’s 7-ohm
resistor. See page
2.4 for recommendations.
123
O
N
↑
123
O
N
↑
S1
S2
O
N
↑
8
9
10
123
+
9
-
10
8
S1
9
S2
10
S3
123
O
N
↑
123
O
N
↑
9-+
10
-
8
10
+
2.8 WATLOW Series 988LF User’s Manual
Installation and Wiring, Chapter 2
Figure 2.8d —
0-20mA or 4-20mA Process
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 7Ω
Remote Set Point Option
Figure 2.8c —
0-5VÎÎ, 1-5VÎÎor 0-10VÎÎ(dc) Process
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 10KΩ
Remote Set Point Option
Figure 2.8b — RTD (2 or 3 Wire) 100Ω
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Remote Set Point Option
20
19-+
Figure 2.8a —
Thermocouple or 0-50mV (high impedance)
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 20MΩ
Remote Set Point Option
Jumper
#19 to #20
for 2 wire
RTD
19
20
18
S2
S1
DIP Switch
Setting
R, S, B
DIP Settings
J, K, T, N, C, E, D, Pt2,
0-50mV DIP Settings
DIP Switch
Setting
19
20
18S2S1
S3
DIP Switch
Setting
NOTE:
Successful installation requires five
steps:
• Model number and
software choice
(Appendix);
• DIP switch settings (Chapter 1);
• Sensor match
(Chapter 2 and
Appendix);
• Sensor installation
(Chapter 2); and
• Wiring (Chapter 2).
Input 2 Wiring
ç
CAUTION:
An external resistor
is required for
0-20mA and 4-20mA
process wiring to
prevent a high inrush current which
could burn out the
controller’s 7-ohm
resistor. See page
2.4 for recommendations.
↑
N
O
123
↑
N
O
123
↑
N
O
123
19
+
-
20
0-50mV
19
+
-
20
↑
N
O
123
↑
N
O
123
-
18
20
+
WATLOW Series 988LF User’s Manual 2.9
Installation and Wiring, Chapter 2
Figure 2.9a — AC Outputs
Solid-state Relay with Contact Suppression
98 _ L - _ _ B _ - A A _ _
0.5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay with Contact Suppression
(NO and COM contacts only)
98 _ L - _ _ D _ - A A _ _
Form C, 5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay without Contact Suppression
98 _ L - _ _ E _ - A A _ _
Form C, 5 amps off-state impedance: 31MΩ
Solid-state Relay without Contact Suppression
98 _ L - _ _ K _ - A A _ _
0.5 amps, off-state impedance: 31MΩ
Output 1 Wiring
Figure 2.9b — Switched DC, Open Collector
98 _ L - _ _ C _ - A A _ _
Minimum load resistance: 500Ω
Figure 2.9d — 0-5V
ÎÎ
, 1-5VÎÎand 0-10VÎÎ(dc) Process
98 _ L - _ _ F _ - A A _ _
Minimum load impedance: 1KΩ
Figure 2.9c — 0-20mA and 4-20mA Process
98 _ L - _ _ F _ - A A _ _
Maximum load impedance: 800Ω
14
-
+
12
14
-
+
13
NOTE:
Successful installation requires five
steps:
• Model number and
software choice
(Appendix);
• DIP switch settings (Chapter 1);
• Sensor match
(Chapter 2 and
Appendix);
• Sensor installation
(Chapter 2); and
• Wiring (Chapter 2).
External
Load
NO
12
13
COM
14
NC
(#14 for D & E outputs only)
Fuse
L2
L1
19 to 32VÎ (VDC)
+ VDC
790Ω
Internal Circuitry
12
13
14
12
+
External
-
13
14
Load
COM
Figure 2.10a — AC Outputs
Solid-state Relay with Contact Suppression
98 _ L - _ _ _ B
- A A _ _
0.5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay with Contact Suppression
(NO and COM contacts only)
98 _ L - _ _ _ D - A A _ _
Form C, 5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay without Contact Suppression
98 _ L - _ _ _ E - A A _ _
Form C, 5 amps off-state impedance: 31MΩ
Solid-state Relay without Contact Suppression
98 _ L - _ _ _ K - A A _ _
0.5 amps, off-state impedance: 31MΩ
2.10 WATLOW Series 988LF User’s Manual
Installation and Wiring, Chapter 2
Figure 2.10b —
Switched DC, Open Collector
98 _ L - _ _ _ C - A A _ _
Minimum load resistance: 500Ω
NOTE:
Successful installation requires five
steps:
• Model number and
software choice
(Appendix);
• DIP switch settings (Chapter 1);
• Sensor match
(Chapter 2 and
Appendix);
• Sensor installation
(Chapter 2); and
• Wiring (Chapter 2).
Output 2 Wiring
19 to 32VÎ (VDC)
+ VDC
Internal Circuitry
790Ω
15
16
17
External
NO
COM
NC
COM
Load
Fuse
+
-
15
16
17
(#17 for D & E outputs only)
15
16
17
External
Load
L2
L1
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