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Watlow Series SD31 ■ 2 ■ Chapter 1 Overview
The Watlow Series SD31 PID, is a microprocessor-
based temperature controller available in the 1/32 DIN
panel mount size. The Series SD31 has a single, uni-
versal input that accepts various thermocouples, RTDs
(resistive temperature devices) or process inputs. (See
the Specifications in the Appendix for further details).
The Series SD31 PID controller offers up to two
outputs. Outputs can be configured as heat, cool, timer,
retransmit, alarm or off (deactivated). The control out-
puts can be independently configured for PID or On-
Off control. PID settings include proportional band, re-
set (or integral) and rate (or derivative).
Standard Series SD31 features include an IP65/
NEMA 4X front panel rating; CE compliance, UL,
CUL, CSA and NSF agency approvals: single, four-digit
displays in red or green; autotuning for heat and cool
outputs; ramp to set point, to gradually warm up your
thermal system; and automatic/manual capability with
bumpless transfer. A low-voltage model is also avail-
able.
Advanced features include Modbus, EIA-485 serial
communications to interface with PC software applica-
tions; and INFOSENSE™ technology that provides
low-cost, high-accuracy thermal sensing.
Other operator-friendly features include LED indi-
cators to aid in monitoring and setting up the con-
troller, as well as a calibration offset at the front panel.
The Watlow Series SD31 automatically stores all infor-
mation in non-volatile memory and provides an addi-
tional back-up for user-selected settings.
For more information on these and all other product
features, refer to the Features Chapter and the Appen-
dix.
Features and Benefits
INFOSENSE™ Technology
• Improves sensor accuracy by a minimum of 50%.
User Definable Menu System
• Simplifies operator interface
User Definable Default Settings
• Restores to user defined controller settings
Advanced Control Algorithm
• Improved process control.
WATVIEW™ Software
• Operation, configuration and data logging with a
standard Windows
®
PC.
Up to Two Outputs
• Application versatility.
• Configuration flexibility.
Ramp to Set Point
• Controls the rate of temperature changes.
Countdown Timer
• Optional countdown timer
Overview
1
Control In
p
u
t
p
Out
p
ut
1
C
ontrol or Alar
m
Out
p
ut
2
Control
,
Alarm or Communication
s
p
p
Figure 2 — Series SD31 inputs and outputs.
- User’s Manual 1
- Series SD31 1
- Single Display PID Controller 1
- Safety Information 2
- Technical Assistance 2
- Warranty 2
- Table of Contents 3
- Overview 4
- autotune 5
- Install and Wire 6
- Removing the SD31 Controller 7
- Wiring the Series SD31 8
- Figure 7b — RTD Input (100 9
- Figure 7c — 0 to 10V 9
- Figure 7d — 0 to 50mV 9
- 0 to 20 mA Process Input 10
- Output 1 Mechanical Relay 10
- Output 1 Solid-state Relay 10
- Output 1 Switched DC 11
- Output 1 Process 11
- Output 2 Mechanical Relay 11
- Output 2 Solid-state Relay 12
- Output 2 Switched DC 12
- Output 2 EIA/TIA-485 12
- 12VÎ (dc) 13
- Ethernet Gateway 14
- Home Page Overview 17
- ;ht] Rate Heat 18
- Setup Page Overview 19
- Factory Page Overview 20
- Programming Page Overview 20
- Read/Write 21
- Offset the input reading 31
- Programming Page Example 37
- Countdown Timer 38
- • SP is used when not timing 40
- Timer Example 44
- Calibrating the Series SD31 48
- Process Output Procedures 49
- Restoring Factory Calibration 49
- Features 50
- Operations Page 51
- Autotuning 51
- IS1 IS2 IS3 IS4 52
- 123 456 789 258 52
- Filter Time Constant 53
- Sensor Selection 53
- Access Lockout 53
- High Scale and Low Scale 53
- Control Methods 54
- On-Off Control 55
- Proportional Control 55
- (PID) Control 56
- Dead Band 56
- Nonlinear output curve 57
- Independent Heat and Cool PID 57
- Variable Time Base 57
- Process or Deviation Alarms 58
- Alarm Set Points 58
- Alarm Hysteresis 59
- Alarm Latching 59
- Alarm Silencing 59
- Retransmit 59
- Communications 60
- Troubleshooting 62
- Error Messages 64
- Appendix 65
- Power Supply H or L 67
- Output 1 C, K, F or J 67
- Output 2 A, C, K, J or U 67
- Timer Option A or T 67
- Prompt Index 70
- Series SD 71
- How to Reach Us 72
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