SurgeX SX2120-SEQ - Power Sequencing Control; Over-Ride Control

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You must be sure to remember the password once it is set as the only way to erase it is to erase
all the set-up information stored in the non-volatile memory. Please consult the factory to get
instructions if you ever need to do this.
The instructions and notes that follow are in the same order as the actual menu items so you can
use this section to work through the programming.
5.1 Power Sequencing Control
Seven menu items must be set up before the SEQ can be used in even a simple system: one for
the type of input, three delays for powering up, and three delays for powering down. The type of
input that you select is governed by whether a DC voltage, contact closure or switch is used to
control the sequencing. Please see section 3.2.1 for details.
Up & Down Inputs Select the option as per section 3.2.1
Delay A On Set the delay in seconds for Bank A powering on
Delay B On Set the delay in seconds for Bank B powering on
Delay C On Set the delay in seconds for Bank C powering on
Delay A Off Set the delay in seconds for Bank A powering off
Delay B Off Set the delay in seconds for Bank B powering off
Delay C Off Set the delay in seconds for Bank C powering off
5.2 Over-Ride Control
The SX2120-SEQ has an optional over-ride and there are four menu items that control this
function. If you do not require an over-ride, you can skip the next four menu items since units are
shipped with this function disabled. The over-ride can be used for such purposes as fire safety
over-ride, and can be set to either force the unit on or force it off when an over-ride signal
occurs. The over-ride input is also used for feedback when two or more SEQs are cascaded
together. This is covered in the applications section.
Over-Ride Input Select “Contact Closure” if a relay or switch is used, or
“5-30V dc” if a DC voltage is used.
Over-Ride Func This selects the functioning of the over-ride. Select “Disable” if you do
not need an over-ride. If you want the over-ride to force the unit on
select “Force On”, and if you want the over-ride to force the unit off
select “Force Off”. If you are cascading two or more SEQs together
then select “Master” for the first unit in the chain, and “Pass-Thru for
all other units in the chain except the last one.
Over-Ride Option This option allows a special delay to be selected for use only when
there is an over-ride. This can be useful, for example, to power-up
equipment faster than normal if there is an emergency and a PA is
required. If the special delay is required select “Special Delay”, or if