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2017 Sensata Technologies
Operation
4.10 Auxiliary Relay Operation
When the PT controller is con
fi
gured as a standalone device (i.e., not networked with a Magnum
inverter/remote), the internal aux relay stays disengaged during normal operation, but engages
when a PT controller fault is detected.
If the PT controller is networked (i.e., connected to a Magnum inverter and remote), the aux relay
can be programmed to manually open or close, work as an automatic voltage-controlled relay
(opens or closes based on VDC and activates either as an active high or active low type relay with
an adjustable time delay), or used as an automatic fault detection relay (engages if a controller
fault occurs).
Info:
This auxiliary relay has three contacts, N.O. (Normally Open), COM (COMmon),
and N.C. (Normally Closed). This means this relay has two sides; COM to N.O. is one
side, and COM to N.C. is the other side. Having two sides means either side can be
open or closed at any time, so using the terms “open” or “close” doesn’t appropriately
describe the relay status. When describing this relay’s contact status or operation, the
terms “engage” and “disengage” are used. When the PT controller energizes the aux
relay to “engage”, the COM to N.O. contacts close and the COM to N.C. contacts open.
When the aux relay is no longer energized, the aux relay will “disengage”, causing the
COM to N.O. contacts to open and the COM to N.C. contacts to close.
Info:
The aux relay disengages if all power (PV and battery) to the controller is lost.
Info:
If the aux relay is engaged, the AUX LED (yellow) turns on and remains on as
long as the relay is engaged, even during PowerSave mode. Once the relay is no longer
engaged (has disengaged), the LED will turn off.
Info:
For information on configuring the aux relay for operation when networked, refer
to the appropriate remote control manual—includes the revision that provides the
PT
Aux Relay
menu (see Section 2.10.3).
4.11 Internal Beeper Operation
The PT controller includes an internal beeper or buzzer that sounds after one of the pushbuttons
on the front display (SELECT or RESET) is pushed and performs an active function
1
.
If the PT controller is networked, the internal beeper can be set to act as an alarm and automatically
turn on if a PT controller fault has occurred, or turn on and off based on high or low battery
voltage. The ability to set a high or low voltage setting means the alarm can be con
fi
gured to
activate either as an “active high” or “active low” type alarm. For information on configuring the
beeper for alarm operation, refer to the appropriate remote control manual—the revision that
provides the
PT Aux Relay
menu (see Section 2.10.3).
Info:
The beeper sounds three times when doing a power-up test (see Section 2.12.2).
Info:
The beeper is located inside the controller and if its sound level is not loud
enough, the aux relay in the controller can be wired with an external alarm; allowing
the aux relay to turn on the alarm if a PT fault occurs or based on high or low battery
voltage—if networked.
Note 1:
An active function means something has happened (or is occurring). An example of an
active function is when a fault occurs and is shown on the display, the action of pressing the
RESET button for 1 second causes the fault to clear and the beeper to sound. On the other hand,
if there is no fault indication and you press the RESET button for one second, nothing happens;
therefore, this action is not performing any active function, so the beeper does not sound.
