SurgeX SX2120-SEQ User Manual

SX2120-SEQ

USER MANUAL

Software Version 1.1

Three-Bank Sequencer

Power Conditioning

Surge Protection

With

1 DESCRIPTION 4

2 FEATURES 5

3 INSTALLATION 5

3.1 120 V

3.2 R

3.2.1 U

3.2.2 O

3.2.3 E

3.2.4 C

OLT CONNECTIONS

EMOTE CONTROL CONNECTIONS

P/DOWN SEQUENCE CONTROL INPUTS

VER-RIDE INPUT

XTERNAL

ONFIRMATION CONNECTION

LED C

ONNECTIONS

4 QUICK START 8

5 PROGRAMMING 9

5.1 P

5.2 O

OWER SEQUENCING CONTROL

VER-RIDE CONTROL

5.3 12V

5.4 A

5.5 F

5.6 O

5.7 S

5.8 R

5.9 P

UXILIARY RELAY

RONT PANEL PUSH BUTTON

UT-OF-RANGE

ELF-TEST FAILURE SHUT DOWN

ESTORE FUNCTIONS

ASSWORD

DC OUTPUT

AC V

OLTAGE SHUT DOWN

10
10
11
11
12
12
12
13
13

5
5

6
7
7
7

6 APPLICATIONS 14

6.1 G

6.1.1 C

6.1.2 12V DC O

6.1.3 A

6.1.4 O

6.1.5 O

6.2 S

6.3 E

6.4 G

6.5 C

ENERAL POINTS

ONTROLLING THE

UTPUT

UXILIARY RELAY

VER-RIDE FUNCTION

THER FUNCTIONS

INGLE UNIT SYSTEM

XPANDED SYSTEM

ANGED SYSTEM

ASCADED SYSTEM

14

SEQ 14

14
15
15
16

16
16
17
18

2

7 TROUBLESHOOTING 24

8 ERROR CODES 25

9 SPECIFICATIONS 26

3

1 Description

The SX2120-SEQ is a 120V 20 amp three-bank AC power sequencer incorporating SurgeX

®

power conditioning and surge protection. The surge protection is rated A-1-1, the highest
standard of the Federal Commercial Item Description for Endurance. The two rack-space steel
enclosure is designed to be installed in a 19 inch equipment rack. A total of fourteen 120V
receptacles are provided on the rear panel, two of which are always on, with the remaining
twelve configured as three sequenced banks of four receptacles, labeled A, B and C.

SurgeX ICE™ Inrush Current Elimination circuitry is incorporated into the SX2120-SEQ. This
eliminates problems associated with inrush currents from large loads such as amplifiers. With
SurgeX ICE™ it is not necessary to take inrush currents into account when designing the AC
power for a system, and special time-delay circuit breakers are not required: you only need to
ensure that the steady-state currents of all products plugged into the SX2120-SEQ are within the
20 Amp rating of the product and within the rating of the AC wiring.

The front panel houses a three-line back-lit LCD display which provides status information in
normal use and allows interaction with menu items during programming. Also on the front panel
are two screwdriver-accessible rotary encoders which are used to step through and select from a
menu of items which determine the operation of the unit. The red push button, when pressed,
causes the unit to power up or power down. This button can be disabled if not required. The red
LED above the button indicates the status of the unit. When the red LED is off the unit is fully
powered down; when it is on the unit is fully powered up; when it is flashing the unit is in the
process of powering up or down.

A built-in AC voltmeter indicates the line voltage on the third line of the LCD display. The
internal voltmeter is a peak reading type which was chosen because most electronic equipment
incorporates a power supply that charges mostly during the AC peaks. Monitoring the peak of
the AC provides a more useful indication of the actual voltage available to the electronic
equipment plugged into the SX2120-SEQ.

The SEQ is microprocessor controlled and designed to be versatile and expandable. Two or more
SEQs can be connected together to provide control and power conditioning for larger systems.
The SEQ can also control other SurgeX products with its auxiliary relay contacts to provide for
expandability. All options are set via the front panel and all connections are made at the rear
panel. An optional password of up to six letters can be entered preventing unauthorized access to
set-up information. All set-up information is stored in a non-volatile memory.

A plug-in Phoenix terminal block on the rear panel accommodates the remote control
connections and also the low-voltage outputs. There are three inputs which control sequencing;
one programmable 12V dc output; and one programmable auxiliary relay providing a pair of
normally-open contacts. The inputs can be controlled by an applied DC voltage from 5V to 30V,
by a contact closure, or by different types of switch; the input selection being made during
programming. The inputs and 12V output are designed to withstand incorrect connections
including polarity reversal and shorts.

4

2 Features

• Unsurpassed SurgeX® power conditioning and surge protection

• Incorporates SurgeX ICE™ Inrush Current Elimination Circuitry

• All time delays and functions easily programmed from the front panel

• Accepts both DC voltage and contact closure type inputs

• Two or more units can be ganged or cascaded together to handle larger systems

• Programmable auxiliary relay output can be used to control other SurgeX® products

• Built-in AC Voltmeter

• Over-ride input can be used to force unit off or force unit on

• Optional password can be used to prevent unauthorized access to set-up information

• Adjustable under-voltage and over-voltage shut-down

• Programmable 12V dc output can be used to drive LEDs or a small relay

• Optional restore after power failure feature

• Auxiliary relay or 12V dc output can be programmed to provide confirmation feedback

3 Installation

The SurgeX SX2120-SEQ is designed to be installed in a 19 inch equipment rack and requires
two units (2-U) of rack space. Connect power to the unit by plugging the cord into a 120V ac, 20
amp receptacle. The SEQ cannot be plugged into a 15 amp receptacle. If a 120V, 20 amp branch
circuit is not available, you will need to have one installed by a licensed electrical contractor.

3.1 120 Volt Connections

The SX2120-SEQ has a total of 14 receptacles: three sequenced banks of four, and two always
on. Each receptacle is rated for a maximum load of 15 amps but the total load of the SEQ must
not exceed 20 amps. Plug the equipment cords into the receptacle banks as needed to turn on
equipment in the required sequence. The “always on” receptacles provide power as long as
power is supplied to the SEQ. Bank “A” always powers up first and off last.

3.2 Remote Control Connections

Remote connections are wired to the green 7-pin plug-in Phoenix terminal block on the rear of
the unit next to the power cord. The terminal block itself is provided in the accessory bag that
you will find in the shipping box. After you have made the connections to the terminal block,
plug it into the connector on the rear of the unit. Never solder (tin) wires before inserting in a
terminal block – solder creeps and you will eventually have loose connections!
The connections are shown below:

5

Pin 1 – Up Input

p

p

p

Pin 2 – Down In
Pin 3 – Over-Ride In
Pin 4 – 12 V dc Out
Pin 5 – Common
Pin 6 – Aux Relay Contact
Pin 7 – Aux Relay Contact

ut

ut

ut

3.2.1 Up/Down Sequence Control Inputs

The SEQ can be controlled by a DC voltage in the range 5V to 30V, by a contact closure (such
as a relay), or by a switch. In this manual the terms “momentary” and “latching” are used when
describing switches. A momentary switch is considered to be a switch which provides a
connection only while it is actually held pressed, and a latching switch is considered to be a
switch which remains in either the on or the off state (such as a light switch). Momentary
switches are preferred for use with the SEQ since multiple control locations can be used, and
also because some of the functions of the SEQ are not available when a latching switch is used
(see programming section). Switches with gold contacts are recommended for the best long-term
reliability. The type of input is selected totally through programming, making the electrical
connections straightforward. The six control options are discussed below:

a) DC Voltage: The SEQ will power up when the voltage is present and power down when

there is no voltage. Connect the positive wire to the “up” input, and the ground (or
negative) wire to “common”. Program the input for “5-30 V dc”.

b) Contact Closure: The SEQ will power up when the contacts are closed and power down

when the contacts are open. Connect the two wires from the contacts to “up” and
“common”. Program the input for “Latching”

c) One Momentary Switch: The SEQ will power up when the switch is pressed once and

power down when the switch is pressed a second time. Connect the two wires from the
switch to “up” and “common”. Program the input for “One Momentary”.

d) Two Momentary Switches: The SEQ will power up when the UP switch is pressed and

power down when the DOWN switch is pressed. Connect the two wires from the UP
switch to “up” and “common”, and the two wires from the DOWN switch to “down” and
“common”. Program the input for “Two Momentary”.

e) Center-Off Switch: The SEQ will power up when the switch is pressed to the UP position

and power down when the switch is pressed to the DOWN position. Connect the wire
from the UP terminal to “up”, the wire from the DOWN terminal to “down”, and the wire
from the COMMON terminal to “common”. Program the input for “Two Momentary”.

6

f) Latching Switch: The SEQ will power up when the switch is closed and power down

when the switch is open. Connect the two wires from the switch to “up” and “common”.
Program the input for “Latching”.

Note: The front panel button will not operate with options a, b or f

3.2.2 Over-Ride Input

The SX2120-SEQ has the option of adding an over-ride function for purposes such as providing
fire safety over-ride to force the system either on or off. An over-ride is initiated by applying a
dc voltage of 5-30V or by a sustained contact closure. The selection of dc voltage or contact
closure is accomplished during programming. This topic is covered fully in the programming
section.

Connect the over-ride signal to the “over-ride” input and “common”. In the case of a dc voltage,
connect the positive wire to “over-ride” and the negative wire to “common”.

3.2.3 External LED Connections

The SX2120-SEQ is able to drive external LEDs or other signaling devices through its 12V dc
output which can provide up to 40mA of current. External LEDs connected in this way will
mimic the red LED on the front panel. When connecting LEDs to the 12V output, a series
resistor is required. For example, many LEDs work well with 10mA of current, so a 1K resistor
is usually a good choice. If more than one LED is required, then use a separate series resistor for
each LED. In this example, four external LEDs could be powered at 10mA each from one SEQ.
If more than four LEDs are required, it will be necessary to increase the series resistor so that the
total load is not more than 40mA.

Connect each LED anode to “12V dc output” through a resistor, and the cathodes to “common”.

Program the 12V dc Output for “LED”. This causes LEDs connected to the SEQ to flash while
the unit is powering up or powering down in the same manner as the front panel LED.

3.2.4 Confirmation Connection

The SX2120-SEQ offers two ways to provide confirmation feedback to a central controller: a
12V dc output and a pair of isolated relay contacts. Confirmation tells the controller that the SEQ
has indeed powered up or that it is fully powered down. If the 12V dc output and the aux relay
contacts are not used for any other function, you will be free to choose whichever provides the
best interface for the application. However, if one of these outputs is used for another function
you will have to use the one that is available.

To use the 12V dc output for confirmation, connect “12V dc output” to the positive input of the
controller and “common” to ground. The output will be at 12V when all banks are powered up
and will be zero when all banks are powered down. Program 12V dc Output for “Confirm”. Note
that the SEQ common terminal is shared between the inputs and the 12V dc output. If you need

7

relay contacts for confirmation and you are using the aux relay for another function you can
connect a small relay between the 12V dc output and common. The relay coil current must not be
more than 40mA, and you must connect a diode such as a 1N4148 or 1N4002 across the relay
coil (cathode to +12V dc) to suppress the back EMF from the coil. If you need assistance with
this please contact our technical support department.

12V dc Output

Common

Connecting a 12 volt relay to the 12V dc output

To use the auxiliary relay contacts for confirmation, connect the two aux relay contacts to the
input of the controller. The relay contacts will be closed when all banks are powered up and open
when all banks are powered down. The default for menu item “Aux Sync” is “Confirm” so you
do not need to program this item unless you previously changed it. The contacts are rated at 30V
dc at 1 amp.

4 Quick Start

This section is intended to allow users with a simple straightforward system incorporating a
single SX2120-SEQ to get up and running with the minimum of effort. If this is not the case then
skip this entire section and go directly to the detailed programming section (section 5). If you are
going to follow the quick start instructions, you only need to perform the following steps since
the unit has been shipped with default settings suitable for basic operation.

1. Make all connections as per section 3.

2. Insert the screwdriver provided in the accessory kit in the hole labeled SEL and turn it one

click clockwise. Press the red button and you should see “Programming” on the display.

3. Set the first item “Up & Down Inputs” as per section 3.2.1 by rotating ADJ.

4. Advance SEL one more click. You will now be able to set the first delay time which is for

bank A powering up. Use ADJ to set the required delay time in seconds.

5. Advancing SEL one click at a time and using ADJ to adjust the delay times, set the

remaining five delay times: B on, C on, A off, B off, C off.

8