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CONNECTIONS, CONTROLS AND INDICATORS
A.
The Master Power Switch Circuit Breaker (with indicator light): Switches power from the line cord to the rest of the unit and additionally provides overload
protection (rated at 15 Amps at 120 VAC). Also provides “power on” indication via the illuminated switch actuator. Master Switch is enhanced by a switch guard to
prevent accidental power switching.
B.
The System Switch (single pole, double throw, center off, momentary): Initiates system start for system sequence up and down. When the master switch
(described above) is on, depressing the top of the system switch initiates the power up sequence. Outputs will activate in ascending order from one to six. The sequence
interval delay and start delay are determined by the “delay adjust” settings (described later). Depressing the bottom of the system switch initiates the power down
sequence. Outputs will deactivate in descending order from six to one. The “delay adjust” settings also function in the “sequence down” mode.
C. Remote Control Terminal Block: This terminal block (located on the rear of the unit) is wired parallel to the system switch. This provides remote control of the system
switch functions. This terminal block has three positions: system up, common, system down. A separately provided switch (single pole, double throw, center off) may be
connected to this terminal block and installed in a remote location (providing a secondary control location). If multiple sequencers are used, the remote control switch may
be connected to the terminal block on any sequencer in the system. This is not limited to one remote location. Several remote switches can be installed if multiple
control locations are required. It is recommended that a “momentary” switch be used, since a control switch left in either the up or down position would “lock out” all
other switches installed on the system, including the system switch on the unit. However, this may have an
advantage if the installation requires a “lock out” function at a specific location. A key type switch (USC-KL, USC-K)
can be installed for added security. Standard telephone cable may be used for the connection
of the remote control switch(s) (500’ max with 22-gauge wire). Longer distances can be achieved by increasing
the wire gauge. The voltage on the remote control circuits is 5 VDC (class 2 wiring).
Another function of the remote control terminal block is to provide a connection point to allow “daisy chaining” of up to three sequencers together. They function
as three separate controllers, controlled by a single actuation of any system switch, or they can be programmed to act as a single 18 channel controller (three units with
six channels each). This programming function is described later, see “delay adjust switches”.
D.
Status Indicators: Six yellow LED indicators are provided to allow visual monitoring of the outputs. As each output is activated, the corresponding channel LED
illuminates (one to six), thus allowing the operator to monitor the status of the sequence operation. Conversely, the LEDs will turn off sequentially (six to one)
during
the “sequence down” operation.
E.
Delay Adjust Switches: There are two delay adjust switches on the unit: Interval Delay (between sequence steps) and Start Delay (both up and down system start).
1. (Interval) Delay Adjust Switch: Three position switch providing a one, three and six second delay between sequence steps. The switch actuator is a slide type, and is
located on the front of the unit. The delay is common to all channels (one through six).
2. Start Delay Switch: Mounted on the rear of the unit. This switch is a four position slide switch (switch positions 0-1-2-3) providing a delay on both “system up” and
“system down” operation. This allows the interconnection of up to three, six channel sequencers to operate as a single 18 channel unit; by delaying the start of
sequencer #2 until sequencer #1 has completed it’s sequence function, then subsequently initiating the start of sequencer #3. At the same time, individual units
are selectively programmed to initiate the “sequence down” function in reverse order. (i.e. unit #3 will begin sequence down first,then unit #2, then unit #1,
“first on – last off”). Switch position #0 is for single sequencer (no start delay, up or down).
The sequencing functions are controlled by elapsed time, not by a “trigger pulse”, therefore, sequence interval and start delay time settings provide great latitude when
interconnecting (“daisy chaining”) up to three units together. This “elapsed time” programming method eliminates many of the problems experienced when a “trigger”
pulse is sent from one sequencer to the next. The start delay is directly proportional to the interval delay, (the longer the interval delay, the longer the start delay).
When “daisy chaining” two or three sequencers together, it is important to set the interval delay the same on all units to provide proper synchronization.
HINT: To ensure a good, longer lasting
connection when connecting wires to a
screw-type terminal block, do not twist or
tin(solder) the conductors on stranded wires.
Start Delay Switch Settings
USC-6R
Middle Atlantic Products
120V 12A 60Hz
0 - Single Unit
1 - 1st Unit of 3
2 - 2nd Unit of #
3 - 3rd Unit of 3
Common
Remote
Down
Up
Start Delay
0-1-2-3
USC Remote
Switch Only
1
12VDC
2
12VDC
OUTPUTS
3
12VDC
4
12VDC
5
12VDC
6
12VDC
1.5A 125V
B
E1
F
A
C
E2
I
H
G
J
UNIVERSAL SEQUENCING CONTROLLER
SEQUENCE
SYSTEM
ON
OFF
POWER
ON
OFF
SEC.
1-3-6
DELAY ADJUST
1
2
3
4
5
6
STATUS
POWER
D
FRONT
REAR
