Walton 935B Series User manual

0600-0015-0001 Rev C $15.00
July 2000
Supersedes: 0600-0015-0001 Rev B
Registered Company
Winona, Minnesota USA
ISO 9001
TOTAL
3YearWarranty
CUSTOMER
SATISFACTION
Series 935B
Temperature Controller
with Countdown Timer
1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580
Phone: [phone], Fax: [phone], http://www.watlow.com
U.S. English
Now with Remote
Timer Start and
Fully DIN-a-mite
®
Compatible
User Levels:
• New User ...................................... Go to page 2
• Experienced User / Set-Up ........ Go to page 11
• Expert User ................................ Go to page 51
Installers:
• Mounting ..................................... Go to page 40
• Wiring Information .......................Go to page 44

Safety Information in this Manual
Note, caution and warning symbols appear throughout this book to draw your attention to
important operational and safety information.
A “NOTE” marks a short message to alert you to an important detail.
A “CAUTION” safety alert appears with information that is important for protecting your
equipment and performance.
A “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 çsymbol (an exclamation point in a triangle) precedes a general CAUTION or
WARNING statement.
The Ósymbol (a lightning bolt in a lightning 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 configuration informa-
tion 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 calling your local Watlow representative (see back cover of this manual), or
in the U.S., dial [phone]. For technical support, ask for an Applications
Engineer.
Please have the following information available when you call:
• Complete model number • All configuration information
• User’s Manual • Diagnostic menu readings
Warranty and return information is on the inside back cover of this manual.
Your Comments
Your comments or suggestions on this manual are welcome. Please send them to the
Technical Literature Team, Watlow, 1241 Bundy Boulevard, P.O. Box 5580, Winona,
Minnesota, 55987-5580 U.S.; Telephone: [phone]; fax: [phone].
Copyright July 2000 by Watlow, Inc., with all rights reserved. (1950)
ç
Safety Alert
CAUTION or
WARNING
∫
Electrical Shock
Hazard
CAUTION or
WARNING

Watlow Series 935B User’s Manual 3
Where to find it…
Table of Contents
Item ............................................................. Page
Introduction ........................................................ 4
How Keys Work ................................................. 6
Begin Controlling ................................................ 8
Set Point Change ............................................... 9
Simple Error / Response ................................. 10
Software Map; Learn ........................................ 11
Operations Menu; Learn .................................. 12
PID Menu; Learn ...............................................14
Configuration Menu; Learn .............................. 18
Lockout Functions ............................................ 20
Setting Up Inputs and Outputs ........................ 22
Using Remote Timer Start Input .......................24
Front Panel Lockout ......................................... 25
Alarms; Learn ................................................... 26
Alarms; Setting and Clearing ........................... 28
Timer; Learn ..................................................... 30
Timer; Setting ................................................... 32
Timer Example ................................................. 33
Auto-tuning ....................................................... 34
PID Fine tuning ................................................ 35
Calibrating ........................................................ 36
Errors and Troubleshooting ............................. 38
Mounting ...........................................................40
Dimensions .......................................................41
Installing ............................................................42
Terminal Block Removal ...................................43
Wiring ............................................................... 44
Wiring Examples .............................................. 45
Glossary ........................................................... 46
Index ................................................................ 47
Specifications ................................................... 48
Ordering Information ........................................ 49
Declaration of Conformity ................................ 50
Advanced Software Map ...................................51
Warranty/Returns ................... Inside Back Cover
How to Reach Us .............................. Back Cover
Table # ..........................................................Page
1 Output Functions ....................................... 5
2 Error Messages & Action ....................... 10
3 Software Organization ............................ 11
4 Operations Menu Overview ................... 13
5 PID Menu Overview ............................... 16
6 Configuration Overview .......................... 18
7 Lockout Options ..................................... 21
8 Setting Inputs & Outputs ........................ 23
9 Using Front Panel Lock .......................... 25
10 Alarm Functions ..................................... 27
11 More Alarm Functions ............................ 29
12 Timer Functions/Settings ........................ 31
13 Possible Error Codes ............................. 39
14 Troubleshoot Outputs ............................... 39
15 Input Range Information ......................... 49
Figure # ........................................................Page
1 Input & Output Overview .......................... 5
2 Front Panel Functions .............................. 7
3 Begin Controlling ...................................... 8
4 Changing the Set Point ............................ 9
5 Front Panel Lock Wiring ......................... 25
6 Auto-tuning ............................................. 34
7 Calibrating .............................................. 36
8 Panel Cut-out Dimensions ..................... 40
9 Knockout Template ................................. 40
10 Dimensions ............................................ 41
11 Case Top View & Collar ......................... 42
12 NEMA 4X/IP65 Seal ............................... 42
13 Terminal Block Removal ........................ 43
14 Wiring ..................................................... 44
15 System Wiring Example ......................... 45
16 Ladder Diagram Example ...................... 45

4Watlow Series 935B User’s Manual
Welcome to the Watlow Series 935B!
General Description
The Series 935B is a temperature controller with countdown timer for industrial, commercial, or scientific applications. It offers
1/32 DIN panel-mounting, digital indication, single temperature sensor input from a thermocouple or RTD, and dual control
outputs. Both outputs are fully DIN-a-mite®compatible, and may operate in combinations of heat or cool, and alarm or timer.
Special Features
• Easy to use operator interface and user’s manual
• Compact panel footprint; 1/32 DIN size
• Water and corrosion proof; NEMA 4X / IP65 rated
• Reliable; built to UL, CUL approved safety standards with a three year warranty
• Accuracy with economy
• Universal power supply for worldwide application
Unique Features
The Series 935B is configured with dual dc DIN-a-mite®compatible control outputs and a separate logic input for remote timer
start or front panel lock. The Series 935B timer functions include heat/timer or cool/timer countdown modes in hours:minutes or
minutes:seconds.
Introduction

Watlow Series 935B User’s Manual 5
Output 1
Output 2
RDY
2
1
SET
Single
Input
Dual Output
Single Input
Type J, K, T, N, S, E Thermocouple, 1° RTD, or 0.1° RTD
Output 1
Switched dc
Heat Cool Alarm
NONE
None
Heat Cool Alarm
30
15 45
0
Timer
(Hr:Min or
Min:Sec)
NONE
None
Output 2
Electromechanical Relay, Switched
dc or Solid-state Relay
Table 1 - Valid Output Functions
First select Output 1: Then select Output 2:
Heat None, Cool, Alarm, Timer
Cool None, Heat, Alarm, Timer
Alarm None, Heat, Cool
None Heat, Cool, Alarm
• The function of Output 1 determines
the options available for Output 2.
• First select the function of Output 1.
Refer to the table (right), then select
the function of Output 2.
Figure 1 - Series 935B Input and Output Overview

6Watlow Series 935B User’s Manual
Press & read or press & change
Reading or Changing
Information is Easy
You can simply:
• Read the normally displayed actual temperature,
or…
• Press and hold ßto read the set point,
or…
1. Press and hold .and ,simultaneously for three seconds to move to a software menu.
2. Press and hold ßto display a choice or value.
3. While continuing to press ß, press .or ,to choose new data or select a new value.
4. Release ßand the arrow key to complete the change.
NOTE: The normally displayed actual temperature and set point can be altered to show different
combinations of actual temperature, set point temperature, or time in hours:minutes or minutes:
seconds. See [dISP] p. 18.

RDY
2
1
SET
Seven-segment
alphanumeric display:
• Shows process value,
set point information, time, or
• Shows prompt name or value,
depending on the key
combination pressed.
Set Key: ß
• Configurable to shift between
normally-displayed value and set
values. See [dISP], p.18.
• Clears a latched alarm.
LED 1:
Lit when Output 1 is active.
LED 2:
Lit when Output 2 is active.
RDY:
Lit when the process temperature
is inside the timer ready band.
Up / . (Increment)
Down / ,
(Decrement) Arrow Key:
• Selects new information when Set
Key is pressed.
• Steps through software menus and
parameters.
• Starts and stops the timer.
• To set up the control, go to the
Easy Software Map, p. 11.
Figure 2 - Series 935B Front Panel Functions
Watlow Series 935B User’s Manual 7

Begin Controlling
To Begin Controlling:
1. Apply power to the system.
A properly-wired Series 935B will begin controlling the thermal system as soon as you apply power
to it.
2. Look at the Series 935B’s display. It is reading actual temperature, set point temperature, or time.
• To change set point, go to p. 9.
• The Series 935B will auto-tune when you tell it to, go to p. 34.
• If you see an error, go to p. 10.
System
Power
RDY
2
1
SET
Figure 3 - Begin Controlling
8Watlow Series 935B User’s Manual

Change Set Point
RDY
2
1
SET
To Change the Set Point:
Your Series 935B displays the actual process temperature when it comes from the factory. You can
change it to normally display the set point or time. Go to p. 18, see [dISP].
1. Press and hold ß.
2. Press one of the arrow keys to alter the set point either upward or downward.
3. Release ßto complete the change.
Figure 4 - Changing the Set Point
Watlow Series 935B User’s Manual 9

Respond to a simple error
Display Probable Cause Recommended Action
Reversed thermo- Change the sensor
couple connection leads on Terminals
+ to –. 1 and 2.
Sensor type Go to {`In} prompt, check
mismatch selection (see p. 22), or check
or open RTD. RTD, replace as necessary.
Sensor type Go to {`In} prompt,
mismatch. check selection
(see p. 22).
Open Thermocouple, Check the sensor,
bad connection, or replace as
broken wire. necessary.
Electrical noise. Cycle power to system. See if error
clears. Check system for electrical
interference.
Control is inoperable. Check for line voltage at
terminals 7 and 8.
RDY
2
1
SET
•Simply correct the cause.
•Errors are non-latching
and self-clearing.
•For advanced error and
troubleshooting
information, go to p. 39.
If You See An Error Code:
1. Be aware that most errors are input (sensor) related.
2. Read the table below and follow its recommendations.
Table 2 - Error messages and recommended action
[`Er1]
[`Er2]
[`Er3]
[`Er4]
[`Er5]
[````]
10 Watlow Series 935B User’s Manual