SurgeX SX-2120 - Manual (Page 14)

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SEQ/SEQ-1U User Manual
Software Version 2.0
6. Applications
The SEQ can be used in four types of configuration: a single unit providing three sequenced banks; an expanded system
where the SEQ controls remote turn-on SurgeX products providing four or five sequenced banks (or three banks with
increased current capacity on extra units); a ganged system where two or more SEQs are connected together such that
they all turn on and off at the same time providing three banks with increased current capacity for all three banks; a
cascaded system where two or more SEQs are connected together such that the banks turn on sequentially from one SEQ
to the next SEQ. Each configuration is covered separately in its own section, but first there are some general points which
apply to all types of installation.
6.1 General Points
This Section provides detailed information about the remote control connections. If you have not already done so,
please read Section 3.2 before continuing. The information in Section 6.1 applies to all types of installations and
you should also read this section before continuing further.
6.1.1 Controlling the SEQ
The SEQ is primarily designed to be used with momentary action switches. A momentary switch is a
switch where the contacts are closed only while the switch is actually pressed, such as a push switch.
Using momentary switches allows several switches to be connected in parallel so that the SEQ can be
controlled from multiple locations. A single push switch would cause the unit to power-up on the first
press and then power down on the second press. A dual momentary switch, such as a center-biased
rocker, or two separate push switches (one for UP and the other for DOWN), can also be used with
equal versatility. It is up to the installer to choose the configuration. Whatever type of switch is used,
switches with gold contacts are recommended for the best long-term reliability.
Where there are multiple control locations it is advantageous to use the 12V dc output to drive LEDs so
that there is an LED at each control location. Up to four LEDs running at 10mA each can be powered
from the 12V dc output. Each control location then has an indication of the operational status of the SEQ
regardless of which location last initiated power-up or power-down.
The SEQ also supports latching switches, contact closure and applied DC voltage, but these types of
input cannot be used with multiple control locations – they are intended primarily for a small system or
for hook-up to a central controller. The front-panel push-button will not work with a latching switch,
contact closure or applied voltage inputs.
6.1.2 12V DC Output
The 12V DC output can be used to drive LEDs, thereby showing the operational status at remote control
locations. This output can drive up to 40mA which can power four LEDs at 10mA each, or more LEDs at
reduced current. A resistor is required for each LED to limit the current. The 12V DC output can also
provide confirmation to a central controller or be used to drive a small relay (40mA maximum coil
current). The 12V DC output can be configured to control an external bank of equipment as an
alternative to or in addition to the Aux Relay. See Section 3.2 for connection details and Section 5.3 for
programming details.
The 12V DC output has a special use when SEQs are cascaded together – this is covered in the section
on cascaded systems.