Macromatic ARP Series Catalog Page
alternating relays | plug-in
Combines functions of alternating
relay, control relay & auxiliary
contacts in one unit--saves money
Offers Sequence On - Simultaneous
OFF (S.O.S.O.) Operation with three
oat switch inputs
Protects against failures of both OFF
& LEAD switches
Compact plug-in design utilizing
industry-standard 8 pin octal
socket saves space over separate
components
Low prole selector switch for
normal alternation or to lock either
load to be ON rst
2 LEDs indicate load to energize rst
with appropriate
DUPLEX CONTROLLERS
3 Float Switch Inputs for S.O.S.O. | ARP Series
Many duplex pump applications require Sequence On – Simultaneous OFF
operation with three oat switch inputs and alternation of which pump is
turned on rst. The two loads are energized sequentially when the LEAD &
LAG switches close, but remain on together until the OFF switch is opened.
Normally, this is all done with a separate alternating relay, a control relay and
two auxiliary contacts. Macromatic Duplex Controllers combine the function
of these individual components in one plug-in product utilizing an 8-pin socket. This reduces the cost of the control panel by saving space, reducing the
number of components and minimizing assembly labor.
A low prole, three-position switch is provided to alternate the two loads as
normal or lock the relay to always operate the same load rst each time.
Operation
In the initial OFF state, all
three switches are open, the
Duplex Pump Controller is in
the LOAD 1 position, and both
loads are off (see Diagram
right). No action happens with
the Controller or either load
when the OFF switch closes.
When the LEAD Switch closes,
LOAD 1 turns on. When the
LAG Switch closes, LOAD 2
turns on. Both loads remain on
as long as all three switches
are closed. When the LAG
Switch opens, LOAD 2 remains on because the Duplex Controller simulates
the function of an auxiliary contact. When the LEAD Switch opens, LOAD 1
remains on for the same reason. When the OFF Switch opens, both LOAD 1
and LOAD 2 are turned off simultaneously because all voltage is removed to
both loads. The Duplex Controller toggles to the LOAD 2 position. The entire
cycle is then repeated, but with LOAD 2 energized rst followed by LOAD 1.
socket
These products protect against failure of the OFF or LEAD Switches—if one
or both of these switches fail to close in sequence, the two LOADS will be
energized when the LAG switch closes. In addition, both LOADS are turned
off simultaneously when the LAG switch opens.
10
CONTROL
VOLTAGE
24V AC/DC
120V AC
CATALOG
NUMBER
ARP024A8R
ARP120A8R
Sockets & Accessories available
WIRING/SOCKET
8 Pin Octal
70169-D
DIAGRAM 58
Application Data
DUPLEX CONTROLLERS
3 Float Switch Inputs for S.O.S.O. | ARP Series
Voltage Tolerances:
AC Operation: +10/-15% of nominal at 50/60 Hz.
DC Operation: +10/-15% of nominal.
Load (Burden): Less than 3VA
Output Contacts: 5A@120V AC/24V DC, B300
Life:
Mechanical: 10,000,000 operations
Full Load: 100,000 operations
Temperature: Operating: -28o to 65oC (-18o to 149oF)
Storage: -40o to 85oC (-40o to 185oF)
Dimensions
Indicator LEDs: 2 LEDs marked LOAD 1 and LOAD 2
Selector Switch Settings:
LOAD 1 (always energizes rst)
ALTERNATE
LOAD 2 (always energizes rst)
Approvals:
File #E109466
File #E109466
with
appropriate
socket
alternating relays | plug-in
All Dimensions in
Inches (Millimeters)
11
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