SCX 920
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Andover Controls Corporation i
SCX 920
Installation Guide
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ii SCX 920 Installation Guide
Version D
Reproduction or d istribution forbidden.
Copyright
1997 by Andover Cont rols.
Subject to change without notice.
Order No. 30-3001-170
Copyright
1997
Andover Controls Corporation
300 Brickstone Square
Andover, Massachusetts 01810
All Rights Reserved.
Published by the Engineering Departm ent at Andover Controls Corporation.
IMPORTANT NOTICE
This product is subject to change without notice. This document does not con-
stitute any warranty, express or implied. Andover Controls Corpor ation re-
serves the right to alte r cap ab ilities, performanc e, and pres e ntation of this
product at any time.
Andover Controls Corporation iii
Preface
The SCX 920 Installation Guide presents instructions for installing the
SCX 920 on an Infinet network. It first presents site prep aration infor-
mation and then step-by -ste p ins talla tion instructions.
iv SCX 920 Installation Guide
Andover Controls Corporation v
Contents
Setting Up the SCX 920 Controller and Infinet
Site/System Setup Requirements .............................................................2
Controller Dimensions and Weight ...............................................3
Power Requirements ......................................................................3
Cable Limitations . ..... .... ... ..... .. ..... .... ... ...... . ..... .. ..... .... ... ...... . ....... .. .3
Lightning Protection ......................................................................4
Building Ground Requirements ..................................................... 4
Inspecting the Ground ....................................................................5
Environmental Requirem en ts ....... ......... .......... ......... ................... ..5
Output Equipment Requirements ..................................................6
Form C Outputs .............................................................................6
Analog Outputs—Voltage .............................................................6
Analog Outputs—Current ..............................................................6
Input Circuit Specifications ...........................................................7
Special Factors for Thermistors .....................................................7
Laying Out the Site Setup ..............................................................9
Installing the SCX 920........................................................................... 10
Parts Requir ed ................ .......... ................... ......... .......... ..............10
Mounting ............. ................... ......... ......... ................... .......... .......10
Disabling the Manual Overrides ..................................................12
Connecting the Battery ................................................................16
Connecting the AC Power ...........................................................16
Selecting the AC Input Voltage ... .......................... ......................1 7
vi SCX 920 Installation Guide
Wiring the Infinet to the SCX 920 ...............................................18
Wiring the Infinet to the Infinity CX 9000 ............... ...................19
Setting the Input Reference Resistor Switches ............................19
Wiring the Inputs .........................................................................19
Wiring the Outputs ......................................................................2 3
Wiring Tristate Outputs ...............................................................23
Wiring Analog Outputs—Voltage ...............................................2 4
Wiring Analog Outputs—Current ...............................................25
Wiring Form C Outputs ...............................................................25
Setting the Override Switches .....................................................26
Connecting Modules to the Expansion Port ................................27
Powering Up the SCX 920 ....................................................... ..............28
Reset Button ............ .......... ................... ......... .......... .................. ...29
Adjusting the LCD View Angle ..................................................29
Completing the Installation ..........................................................30
Connecting the Andover Controls Service Tool .................. ....... .3 0
Adjusting Analog Override Values .............................................30
Andover Controls Corporation vii
Figures
Figure 1. The Front Cover of the SCX 920 .......................... ....... ....... .1 1
Figure 2. Locations of Screw Holes, Other Openings in Cabinet .......13
Figure 3. The Printed Circuit Board of the SCX 920 ........... ....... ....... .1 5
Figure 4. Metal Plate and Screw for Power Supply Wire ...................17
Figure 5. Infinet Cable Wiring ............................................................18
Figure 6. Wiring Diagram for Thermis tor Input ............ ....... .. ..... .... ... .2 1
Figure 7. Wiring Diagram for Counter or Digital Input...................... 21
Figure 8. Wiring Diagram for Voltage Input .......................................22
Figure 9. Wiring Diagram for Curren t Input ...................................... .22
Figure 10. Wiring Diagram for Tristate Outputs ...................................24
Figure 11. Wiring Diagram for Voltage Outputs ..................................25
Figure 12. Wiring Diagram for Current Outputs ...................................25
Figure 13. Wiring Diagram for Form C Outputs ...................................26
Figure 14. Five Positions on Odd Numbered Override Switch............. 27
viii SCX 920 Installation Guide
Tables
Table 1. Wire Gauges and Corresponding Maximum Runs
for Sensing Temperatures Up to 70
º
F ...................................8
Table 2. Wire Gauges and Corresponding Maximum Runs
for Sensing Temperatures Up to 100º F .................................8
Table 3. Wire Gauges and Corresponding Maximum Runs
for Sensing Temperatures Up to 150º F .................................9
Table 4. Connecting Jumpers for AC Input Voltages .. ....... ....... ....... .1 7
Table 5. Corresponding Override Swit ch Settings
for Different Outputs Types .................................................2 7
SCX 920 Installation Guide 1
Setting Up the SCX 920
Controller and Infinet
This manual covers the following:
• Site/System Setup Requirement s
• Installing the SCX 920
• Powering Up the SCX 920
Warranty Registration
Your warranty is effective for 18 months starting on the date the system
is shipped.
Warning
All wiring and installations must comply with local, state, and national
electrical codes.
Hardware Instal lation
2 SCX 920 Installation Guide
Site/System Setup Requirements
Before you proceed to install the system, you should map out where you
plan to install each controller, terminal/workstation, and modem. When
planning the sites, be aware of any electrical interference that may oc-
cur. You also need to be aware of cabinet dimensions, power
requirements, cable limitations, an d environm ental requir e ments .
Note
This equipment has been tested and found to comply with the limits for
a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions in this manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Note
This digital apparatus does not exceed the Class A limits for radio noise
emissions from digital apparatus set out in the Radio Interference
Regulations of the Canadian Department of Communications.
Avis
Le présent appareil numérique n’émet pas de bruits radioélectriq ues
dépassant les limites applicables aux appareils numériques de la class A
prescrites dans le Règlement sur le brouillage radioélectrique édicté par
le ministère des Communications du Canada.
Hardware Installation
SCX 920 Installation Guide 3
Controller Dimensions and Weight
Each SCX 920 is 14.7 × 10.7 × 2.75 in. and weighs 8 lbs.
Power Requirements
Caution
The SCX 920 should receive power from its own independent,
unswitched circuit.
You can select a power supply voltage of 24 V, 120 V, or 240 V. You
receive it set to 115 V. Instructions for selecting the power supply you
want are included with the installation.
Voltages you can select are as follows (each uses a 3 A slow blow fuse):
• 24 VAC +/– 20% 50/60 Hz (for smoke control applications
24 VAC +10/– 15% 60 Hz)
• 120 VAC +/– 20% 50/60 Hz (for smoke control applications
120 VAC +10/– 15% 60 Hz)
• 240 VAC +/– 20% 50/60 Hz (for smoke control applications
240 VAC +10/– 15% 60 Hz)
The SCX 920 consumes 32 VA of power.
Cabl e Limitations
The maximum cable length for all buses is 4,000 ft at 19,200 baud (up
to 32 Infinet controllers). You can extend buses beyond 4,000 ft or put
more than 32 Infinet contr ollers on less than 4,00 0 ft by using the
InfiLink 200 amplification module.
Note
You mu s t use s hie ld ed ca bl es f o r Infinet to ensure compliance with the
Class A FCC limits and to provide reliable communications.
Hardware Instal lation
4 SCX 920 Installation Guide
Cables that form Infinet are 24-gauge, single-t wis ted-pair , tin ned,
shielded copper wire.Use the following cables
1
or their equivalents:
• Brand Rex # H 9002 (single-pair)
• Anixter # 9J2401021 (single-pair plenum cable)
The cable should have a nominal impedance of 100 Ohms and a nominal
velocity of propagation of 78%. Capacitance of Infinet cable should be
nominal, below 12.5 pF/ft between conductors and below 22 pF/ft be-
tween the conduc t or connected to grou nd and the ne xt conductor.
Lightning Protection
Lightning Arresters are required at each point where a bus cable enters
or exits a building. Use the following arrester:
Two pair gas tube arrester, Andover Controls # 01-2100-299
Building Ground Requirements
Warning
Be sure that all Infi nity products from Ando ver Controls Corporation
are grounded to true earth ground. This kind of ground protects the
equipment from transients and other power surges in the area.
We cannot guarantee that the controller system will operate as
documented unless you properly grou nd all control lers .
Warning
Be sure to have your grounds inspected before you begin the
installation process to be sure your municipality follows the National
Electrical Code. M a ny muni ci palitie s do not an d often have
substandard electrical grounds.
An example of a substandard ground is a galvanized steel cold water
pipe. As the pipe corrodes, it does not act as a true ground. The corro-
1. You can also use any cables you may already have in place for ACNET or LBUS.
Hardware Installation
SCX 920 Installation Guide 5
sion acts as an insulator, raising the potential of the pipe with respect to
the ground.
When lightning strikes in the area of the ins talla tion, it drastically
changes the potential of the earth. Since properly grounded Andover
Controls units respond to changes in potential more rapidly than poorly
grounded electrical systems, a poorly grounded buildi ng tries to reach
ground through the Andover Controls system. The surge of current can
destroy electronic components on the controller board.
Surges of much lower potential than lightning also impact the reliability
of Andover Controls equipment.
Inspecting the Ground
You can check your ground as follows:
1. Check your ground by first inspecting the building power
distribution panel for earth ground termination. If the ground
termination is any of the following, it is not adequate and must be
corrected:
• Does not exist.
• Is connected to a corroded or galvanized pipe.
• Is connected using a small gauge wire (less than 14 AWG).
2. Be sure your Andover Controls cabinet is connected to the ground
with a copper conductor that terminates at the distribution panel.
Environmental Requirements
The SCX 920 operates in rooms with temperatures ranging from 32 to
120°F and with humidity up to 85%, non-condensing.
The controller must be in an Underwriter Laboratories approved
enclosure.
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