Ariens Path-Pro 136E User Manual Page 21
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Definitions
Ground Loop
-
A condition created when two or more paths for electricity are
created in a ground line, or when one or more paths are created in a shield.
Earth Ground
-
The starting point for safety and computer grounds.
It is usually
a copper rod driven into the earth.
Safety Ground
-
A ground line run with electrical power wiring to protect personnel.
Computer Ground
-
A ground line for the ground connections to computers
or microprocessor-based systems. This line is isolated from safety ground.
Common Mode Line Filter
-
A
device
to filter noise signals present on both
power
line legs with respect to ground.
Differential Mode Line Filter
-
A device to filter noise signals present
between the two power lines themselves.
The D
OS
and
Don’ts
of Clean Input Power
Do keep line filters as close to the control as possible to minimize the area for
interference pick up.
Do use twisted pair wire and possibly shielded wire from line filters to the control to
keep the line “clean”.
Do keep low power control wires physically separated as far as possible from line
voltage wires. Also keep all controller wiring separate from other nearby wiring.
Physical separation is extremely effective. A 12 inch
(304.8mm)
minimum separation is
usually effective.
Do use common mode, differential mode or a combination of the two filters
wherever power may have electrical interferences.
Do cross other wiring at
90°
angles whenever crossing lines is unavoidable.
Do have a computer ground line separate from all other ground lines. This computer
ground line should terminate at the ground rod where the electrical service is grounded.
Don’t connect computer ground to safety ground or any other ground points in
the electrical system, except at the ground rod.
Don’t
mount relays or switching devices close to a microprocessor control.
Don’t run wires carrying line voltage with signal wires (sensor, communications or
other low power lines) going to the control.
Don’t use conduit for computer ground.
Don’t
have phase angle-fired devices in the same electrical enclosure or on the
same power line with the control.
Don’t
connect ground to the control case if the control is mounted in a grounded
enclosure (prevent ground loops).
Don’t fasten common mode line filters or filters with metal cases to metal that is at
ground potential. This prevents ground loops and maintains filter
effectiveness.
How to Install and Wire, Chapter 4
WATLOW Series
920
User's
Manual
21
- 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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