Andover Controls SCX 920 User manual

Andover Controls Corporation i
SCX 920
Installation Guide
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

ii SCX 920 Installation Guide
Version D
Reproduction or distribution forbidden.
Copyright  1997 by Andover Controls.
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 Department at Andover Controls Corporation.
IMPORTANT NOTICE
This product is subject to changewithout notice. This document does not con-
stitute any warranty, express or implied. Andover Controls Corporation re-
serves the right to alter capabilities, performance, and presentation of this
product at any time.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

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 preparation infor-
mation and then step-by-step installation instructions.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

iv SCX 920 Installation Guide
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

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 Requirements ........................................................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 Required ..............................................................................10
Mounting ......................................................................................10
Disabling the Manual Overrides ..................................................12
Connecting the Battery ................................................................16
Connecting the AC Power ...........................................................16
Selecting the AC Input Voltage ...................................................17
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

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 ......................................................................23
Wiring Tristate Outputs ...............................................................23
Wiring Analog Outputs—Voltage ...............................................24
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 ..........................30
Adjusting Analog Override Values .............................................30
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Andover Controls Corporation vii
Figures
Figure 1. The Front Cover of the SCX 920 .........................................11
Figure 2. Locations of Screw Holes, Other Openings in Cabinet .......13
Figure 3. The Printed Circuit Board of the SCX 920 ..........................15
Figure 4. Metal Plate and Screw for Power Supply Wire ...................17
Figure 5. Infinet Cable Wiring ............................................................18
Figure 6. Wiring Diagram for Thermistor Input ..................................21
Figure 7. Wiring Diagram for Counter or Digital Input...................... 21
Figure 8. Wiring Diagram for Voltage Input .......................................22
Figure 9. Wiring Diagram for Current 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
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

viii SCX 920 Installation Guide
Tables
Table 1. Wire Gauges and Corresponding Maximum Runs
for Sensing Temperatures Up to 70ºF ...................................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 ........................17
Table 5. Corresponding Override Switch Settings
for Different Outputs Types .................................................27
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

SCX 920 Installation Guide 1
Setting Up the SCX 920
Controller and Infinet
This manual covers the following:
• Site/System Setup Requirements
• 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.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
2 SCX 920 Installation Guide
Site/System Setup Requirements
Before you proceed to install thesystem, you should map outwhere you
planto installeachcontroller,terminal/workstation, andmodem. 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, and environmental requirements.
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 radioélectriques
dépassant les limitesapplicables aux appareils numériques de la class A
prescrites dansle Règlement sur le brouillageradioélectrique édicté par
le ministère des Communications du Canada.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

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.
Cable 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 controllers on less than 4,000 ft by using the
InfiLink 200 amplification module.
Note
You must use shielded cables for Infinet to ensure compliance with the
Class A FCC limits and to provide reliable communications.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
4 SCX 920 Installation Guide
Cables that form Infinet are 24-gauge, single-twisted-pair, tinned,
shielded copper wire.Use the following cables1or 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 conductor connected to ground and the next 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 Infinity products from Andover 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 ground all controllers.
Warning
Be sure to have your grounds inspected before you begin the
installation process to be sure your municipality follows the National
Electrical Code. Many municipalities do not and 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.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

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 installation, 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 building tries to reach
ground through the Andover Controls system. The surge of current can
destroy electronic components on the controller board.
Surgesof much lower potential thanlightning 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.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
6 SCX 920 Installation Guide
Output Equipment Requirements
The eight outputs on the SCX 920 are universal and can be wired to pro-
vide direct digital control for virtually all electronic devices, pneumatic
analog devices, and bi-directional motors and actuators. They can be
wired so that you have Form C, analog (voltage or current), or tristate
outputs, or a combination of them.
Analog outputs can be a variablecurrent (0 to 20 mA) or a variable volt-
age (0 to 20 V). In addition to standard ON/OFF for digital outputs and
(and ON/OFF/–ON for tristate), both digital and tristate outputs have
pulse width modulation (PWM). PWM allows you to modulate valves
and dampers to 0.1 sec resolution.
All outputs are programmable. Eight override rotary switches let you
either manually control each output or set it to AUTO so the controller
can control it.
Form C Outputs
The Form C relay of each output is rated for 5 A at 50 VAC.
Analog Outputs—Voltage
The voltage output provides 5 mAmaximum output over the range of 0
to 20 VDC. The input impedance of the device being controlled can be
no less than 4000 Ω.
Analog Outputs—Current
The current output provides a 0 to 20 mA control signal. The input
impedance of the device being controlled can be no greater than 750 Ω.
The circuitry that produces the 0 to 20 mA signal acts as a “current
sourcing device.” It sources the current to ground.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
SCX 920 Installation Guide 7
Input Circuit Specifications
Caution
Andover Controls inputs are designed to be used with two-wire devices
and do not provide sufficient power to operate sensors or transducers
requiring an external power supply.
The following specifications apply to SCX 920 inputs:
• Voltage Range—0 to 10.000 V
• Resolution—0.0025 V
• Accuracy—+/–0.005 V
• Maximum Pulse Frequency—5 Hz at a duty cycle of 50% and a
minimum pulse width of 100 ms
• Input Impedance—30.1 KΩreferenced to 10.000 V
or 10 MΩreferenced to ground with the input reference resistor
switch set to OUT
• Filtering—Corner Frequency at 16 Hz –20 db/decade
• Over-Voltage Protection—120 VAC RMS or 120 VDC indefinitely
on any single channel; +/–1500 V transient for 50 µs on all channels
• Calibration—Permanent (factory)
Special Factors for Thermistors
To keep thermistor errors minimal, lay out your site so you can limit the
length of wire runs to the maximum for the gauge wire you select.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
8 SCX 920 Installation Guide
Table 1 shows the maximum runs for wires of various gauges to keep
errors within .5°F, .25°F, and .10°F when sensing temperatures up to
70°F.
Table 2 shows the maximum runs for wires of various gauges to keep
errors minimal when sensing temperatures up to 100°F.
Table 1. Wire Gauges and Corresponding Maximum Runs
for Sensing Temperatures Up to 70
°
F
Gauge 1/2°F Error 1/4°F Error 1/10°F Error
#14 26,700 ft 13,300 ft 5300 ft
#16 16,800 ft 8400 ft 3300 ft
#18 10,500 ft 5200 ft 2100 ft
#20 6600 ft 3300 ft 1300 ft
#22 4100 ft 2000 ft 800 ft
Table 2. Wire Gauges and Corresponding Maximum Runs
for Sensing Temperatures Up to 100
°
F
Gauge 1/2°F Error 1/4°F Error 1/10°F Error
#14 12,700 ft 6300 ft 2500 ft
#16 7900 ft 3900 ft 1500 ft
#18 5000 ft 2500 ft 1000 ft
#20 3100 ft 1500 ft 600 ft
#22 1900 ft 900 ft 300 ft
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
SCX 920 Installation Guide 9
Table 3 shows the maximum runs for wires of various gauges to keep
errors minimal when sensing temperatures up to 150°F.
Laying Out the Site Setup
You may want to draw a map of where you plan to put each controller
and store it in a notebook.
Find the tag attached to each controller that gives the numberof the con-
troller. Before you remove any tags, be sure the tag has all of the
following information on it:
• Location of the controller.
• Serial number.
• Model name and number.
• Communications port the Infinet connects to on Infinity CX 9000.
Thencollect thetags. You willneed to know whereyour controllers are
located when you later assign a name to each controller and each input
and output.
Table 3. Wire Gauges and Corresponding Maximum Runs
for Sensing Temperatures Up to 150
°
F
Gauge 1/2°F Error 1/4°F Error 1/10°F Error
#14 4100 ft 2000 ft 800 ft
#16 2600 ft 1300 ft 500 ft
#18 1600 ft 800 ft 300 ft
#20 1000 ft 500 ft 200 ft
#22 650 ft 300 ft 130 ft
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
10 SCX 920 Installation Guide
Installing the SCX 920
Parts Required
To install a single controller you start with the following parts:
•SCX 920 Controller
• AC Power Cable
• Input and Output Wires
•Infinet Cable (twisted pair)
•InfiLink 200s as Hubs, Repeaters, or Cable Switching Boxes
Mounting
Caution
You must encase the SCX 920 in a UL approved cabinet to keep its
Open Class rating.
1. Before you begin, look at the front of the SCX 920 cover.
Figure 1 shows the front of the SCX 920.
2. The front cover of the SCX 920 has two Phillips head quarter turn
fasteners aligned down the center, one above the middle and one at
the bottom. Remove those fasteners, holding the cabinet firm so it
does not fall.
3. Remove the cover and place it to one side.
4. If you want to disable the manual overrides, proceed to the next
section and return here when you are finished. Otherwise, continue
with the next step.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
SCX 920 Installation Guide 11
Figure 1. The Front Cover of the SCX 920
6
0
1
2
1/4 Turn Fastener
123
45
789
+/–
SHIFT
LOCK
BACK
SPACE
CANCEL
ENTER
ON OFF – ON
CPU
3
RD
TD
4
OVERRIDE
6
7
8
EXTERNAL
+24V
5
1/4 Turn Fastener
SCX 920
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Hardware Installation
12 SCX 920 Installation Guide
Note that the LCD screen and keypad are optional.
Caution
Never drill holes in the SCX 920 cover or boards. A metal shaving
could easily short circuit the electronics.
5. Screw the SCX 920 to the wall using standard No. 8 screws in the
pre-cut holes in the four corners of the base plate.
Figure 2 shows the location of the corner screw holes and
measurements to other all openings in the cabinet.
Disabling the Manual Overrides
Caution
Be sure power is off during this process, or controller will malfunction.
Before you begin these instructions removethe front cover as described
under Mounting, the previous section.
On top of the printed circuit board is an inner plastic housing connected
by a single screw in the back and six snap latches, one on the top and
bottom and two on either side.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com