Ariens Path-Pro 136E User Manual Page 20
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Chapter 4
How to Install and Wire the Series 920
This chapter tells you how to install the Series 920.
All
mounting and wiring
information is right here.
Because
Watlow
controls are thoroughly tested, and
“burned in” before leaving the factory, the Series 920 is ready to install when you
receive it.
But before you begin working or cutting holes in
panels,
read through this
chapter to gain an understanding of the entire installation. Consider sensor
installation carefully. You’ll need to look at the noise reduction guidelines before
making your panel cutout.
Sensor Installation Guidelines
We suggest that you mount the sensor at a location in your process or system
where it reads an average temperature. Put the sensor as near as Possible to
the material or space that you want to control. Air flow past this sensor should be
moderate. The sensor should be thermally insulated from the sensor mounting.
Excessive lead length
in a two-wire
RTD
sensor can create indication
errors.
To
combat this, use a three wire sensor in long lead applications.
Input Power Wiring
Microprocessors are in a way
like trout...
They require a clean environment to be successful and to prosper. A clean
environment means on one level an environment that is free of excessive dust,
moisture and other airborne pollutants. But primarily it means a “clean” source
of input power from which to base all its operations. What is “clean power”?
Clean power is simply a steady, noise-free line voltage source that
meets
the
rating specifications of the hardware using it. Wiihout clean power to the
integrated circuitry, any microprocessor chip
isdoomed
to failure.
Just as the water you get from a tap nowadays may not be
acceptable
to drink
in some locales, so the line voltage coming into your facility may not be accept-
able for your microprocessor devices. You may have to fitter or “clean” the
water or the power. In industrial environments, the potential for pollutants
increases, especially electrical noise due to high level power
consumption
occurring in one place.
The recommendations we are providing for you are ways to achieve a minimum
level of clean input power protection.
In almost all cases these
guidelines
remove the potential for input power problems.
If you’ve applied these meas-
ures and still do not get results, please feel free to call us at the factory. We
are here to see that our control products work well and do the job they were
designed to do.
20
WATLOW
Series
920 User’s Manual
How to Install and Wire, Chapter 4
HoHow w to Install and Wire, Chapter 4
- Series 920 1
- Safety Information 2
- Your Program 3
- Contents 4
- Figures, Tables and Charts 5
- Chapter 1 6
- Starting out with the 6
- Watlow Series 920: 6
- Packing List 7
- How to Open the 920 8
- How to Set the DIP Switches 8
- User’s Manual 9
- Operating 10
- Chapter 11
- Keyboard Area 13
- Where To Go From Here 13
- A Brief Overview 14
- Enter Real Time of Day 14
- Before Entering Your Program 15
- Programming. File 1 15
- Step 4 must be 16
- Editing Your Program 17
- Adding an AUTOSTART Step Type 17
- Running Your Series 920 19
- Chapter 4 20
- How to Check for Ground Loops 22
- Noise Suppression Devices 22
- Available from Watlow 22
- C.M.Line Filter 23
- Installation Information 24
- Installation Procedure 24
- How to Wire the Series 920 25
- Power Wiring 26
- T.C. Compensation 27
- Load from 30
- Temperature Conrol 32
- How to Tune the Series 920 33
- Series 920 User’s 34
- Chapter 6 36
- How To Program The Series 920 36
- Event Outputs 37
- Guaranteed Soak 37
- The Four 38
- JUMPLOOP 38
- Rules to Follow 39
- SYSTEM Menu 40
- .:.:.:.: 41
- SETUP Menu 42
- Represents the 45
- PROGRAM Menu 49
- StepType 50
- To Program 52
- 920, Chapter 6 52
- Chart I- Master Step Chart 53
- Chapter 7 54
- Alarm Types 55
- The Operating Band 56
- Alarm Limits 57
- Clearing An Alarm Message 58
- An Alarm And The State 58
- The Alarm Relay 58
- Appendix 59
- Series 920 Specifications 59
- 920 User’s Manual 60
- 61
- Type J, K, or T 62
- Reference Compen 62
- Equipment Required 63
- Setup and Calibration 63
- @)(sJ(g; 64
- Glossary 67
- Accepts the sensor input and 68
- Isolation: 70
- ON/OFF control: 71
- WATLOW Series 920 73
- Manual 73
- Thermal System: 74
- Safety Information, 2 76
- Warranty Information 77
- Returning Merchandise 77
- Shipping Claims 77
- Series 920 Error Codes/Alarms 78
- Clearing an Error Code 79
- How to Clear an Alarm Code 79
- Series 920 Quick 80
- Reference 80
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