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6.3
Expanded System
A basic expanded system consists of an SEQ in combination with a remote turn-on SurgeX such as the SX1120-
RT or the SX20-NE/RT. Such a system provides a total of four banks and 40 Amps total load capacity. The
auxiliary relay inside the SEQ is normally used to control the second unit although the 12V DC output can also be
used for this purpose. The only difference in these remote control configurations is that, when the aux relay is
used to control a second unit, it cannot be used for confirmation feedback to a central controller, and when the
12V dc output is used for control it cannot be used to drive LEDs.
If more current capability is required, additional SurgeX RT products can be connected to the second unit.
Connect pins 6 & 7 of the second unit to pins 1 & 2 of the third unit, and so on.
It is possible to configure a five bank expanded system by using both the aux relay and the 12V dc output to
simultaneously control two separate pieces of equipment or two racks of equipment. In this case, refer to Figures
3, 4 & 5 and follow the instructions below.
The SEQ in an expanded system can be controlled by the same inputs as a single unit system.
Figure 3 (page 16) shows how the two units are wired together using the aux relay contacts. The aux relay
contacts on the SEQ (terminals 6 & 7) are connected to the contact closure inputs at the back of the RT
(terminals 1 & 2). In order to work as a 4-bank system the aux relay must be programmed accordingly. The Aux
Output menu item must be set to A, B or C. This synchronizes the aux relay to one of the internal triggers used
for main banks A, B or C. The Aux Delay On and Aux Delay Off delay times are then set to position the 4
wherever it is required to be in the sequence. As an example: if an SX1120-RT, connected to an SEQ, should
turn on last and off first, the menu items shown below should be programmed as follows:
Menu Item
Delay C On
Delay C Off
Aux Output (or 12V DC Output)
Aux (or 12V) Delay On
Aux (or 12V) Delay Off
*These delay times are an example. Set actual times as required for each application.
In the above example, the turn-on delay for Bank C is 5 seconds and the turn-on delay for the SX1120-RT is 10
seconds. Because the Aux Output is set to Bank C, the same internal trigger is used to start both time delays.
What then happens is that after Bank B turns on, there is a 5 second delay before Bank C turns on, then there is
further 5 second delay before the SX1120-RT turns on (the 10 second timer started at the same time as the 5
second timer for Bank C). When it is time to power down, the SX1120-RT turns off immediately (the delay is set
to zero), then 5 seconds later Bank C turns off.
In another example, if the SX1120-RT should turn on first and off last, the programming would be as follows:
Menu Item
Delay A On
Delay A Off
Aux Output (or 12V DC Output)
Aux (or 12V) Delay On
Aux (or 12V) Delay Off
*These delay times are an example. Set actual times as required for each application.
© SurgeX | Technical Support: 800-645-9721 | surgex.com
SEQ/SEQ-1U
User Manual
Software Version 2.0
Setting
5*
5*
C
10*
0
Setting
5*
5*
A
0
10*
bank
th
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