Wiring the Control Panel
Operation
SJE Rhombus Model 124 Single Phase Duplex control panel
operates with float switches. When all floats are in the
open or OFF position, the panel is inactive. As the liquid
level rises and closes the STOP float, the panel remains
inactive until the LEAD float closes. At this point the LEAD
pump will turn ON (if the Hand-Off-Auto switch is in the
AUTO mode and the power is ON). The pump will remain
ON until both the STOP and LEAD floats return to their OFF
positions. If the liquid level rises beyond both the STOP
and LEAD floats to reach the LAG float, the lag pump will
turn ON (if the Hand-Off-Auto switch is in the AUTO mode
and the power is ON). Both pumps will remain ON until the
STOP, LEAD, and LAG floats return to their OFF positions.
If the liquid level rises to reach the ALARM float, the alarm
will be activated.
Alarm System (Indicator Light and Horn)
When an alarm condition occurs, the red light and horn will
be activated.
If the
TEST/NORMAL/SILENCE
switch is moved to the
SILENCE position and released, the horn will be silenced.
When the alarm condition is cleared, the alarm system is
reset.
Circuit Breakers
(optional)
Circuit Breakers provide pump disconnect and branch
circuit protection.
Auxiliary Contact
Form C - Can be wired normally open or normally closed.
Hand-Off-Auto (HOA) Switches
The HOA 3-way switches control pump functions.
In HAND mode, the pump will turn ON.
OFF turns the pump OFF.
In AUTO mode, commands from the float switches
turn each pump ON and OFF.
Motor Contactors
Motor contactors control pumps by switching electrical lines.
Adjustable Overloads
(optional)
Adjustable overloads provide thermal overload protection
for pump.
Intrinsically Safe Module
The intrinsically safe module limits the amount of energy to
switches preventing ignition of flammable gases.
1
Determine conduit entrance locations on control panel as shown.
Check local codes and schematic on the inside cover of the panel
for the number of power circuits required.
Be sure the pump power voltage and phase are the same as the
pump motor being installed.
2
Connect the following wires to the proper terminal positions:
•
incoming power
•
pump 1
•
pump 2
•
float switches
See schematic on inside cover of the control panel for details.
CAUTION!
Technical support,
service questions:
1-800-Rhombus
(1-800-746-6287)
Monday - Friday
7:00 AM to 6:00 PM Central Time
?
3
Verify correct operation of control panel after installation is
complete.
3
Type 4X conduit must be used to maintain a Type 4X rating of
the control panel.
You must use conduit sealant to prevent
moisture or gases from entering the panel.
CAUTION!
Typical Layout (May vary with options ordered).
