True Blue Power
®
16
Manual Number 9017680
a division of Mid-Continent Instrument Co., Inc.
Revision G, July 17, 2019
If the load exceeds approximately 120% to 130% of rating or 1450VA to 1550 VA
(approximately 720 VA for the 6431200-5), the output will limit by clipping the peaks of AC
sine wave, limiting the power output.
At loads higher than approximately 1500VA, the inverter will not only clip the peaks of the AC
sine wave output, but will begin to cycle the AC output ON and OFF at a 5 to 7 second rate
further limiting the output power. Loads connected to the inverter output which use a power-
ON momentary pushbutton feature will automatically turn-off when inverter output turns-off
which should automatically remove some of the load on the AC circuit. When the inverter
output cycles back to ON a few seconds later, the reduced load may allow the inverter to
automatically return to continuous normal output.
At a full short circuit, a TI1200 series inverter will only draw around 10 amps from the 28V
input, and will cycle ON and OFF at a 5 to 7 second rate continuously.
Once the overload or short circuit condition is removed, the AC output will return to normal
operation within 7 seconds.
4.2.6 Over-Current and Installation for the 6431200-4
The typical TI1200 series provides for an instantaneous peak-power output of greater than
1800 VA. However devices such as microwave ovens using an internal high-voltage
transformer with rectified output to a magnetron, or electronic coffee makers that control
heating by AC phase-modulating the heating element may be rated for an average of only
1200VA, but may exhibit an instantaneous peak power of 2200VA. For these applications,
the 6431200-4 inverter is specially intended to meet the requirements of high peak-power AC
loads with high crest power-factor or AC phase-modulated power requirements.
At loads exceeding the overcurrent setting of the 6431200-4, the inverter will clip the peaks of
the AC sine wave output. At higher levels than this the AC output will cycle ON and OFF at a
5 to 7 second rate limiting output power. At a full short circuit, the inverter will only draw
around 10 amps from the 28V input, and will cycle ON and OFF at a 5 to 7 second rate
continuously.
Once the overload or short circuit condition is removed, the AC output will return to normal
operation within 7 seconds.
Because the overcurrent operation of the 6431200-4 is set much higher, this model of
inverter should be direct wired to the load, or have a dedicated outlet to the item being
powered. The output of the inverter should not be available for general cabin use or
inadvertent overloading of the inverter could occur damaging the inverter.
4.2.7 Over-Current and the 6431200-7
The TI1204 model 6431200-7 does not cycle the AC output ON and OFF at high overload.
During high overload and short-circuit this model inverter will power for 8 to 15 seconds
before latching OFF. Either the input power or the ENABLE must be cycled to restore inverter
output. This inverter operates same as the legacy unit this model replaces.
4.2.8 Temperature Regulated Cooling
The unit is equipped with two internal brushless DC fans for cooling to extend the power
range and long-term life. The fans are activated at a specified point determined by the
continuous monitoring of the internal temperature. The fans operate very quietly to reduce the
audible noise in any environment. The two fans provide independent redundancy for
protection of the unit in the event that one becomes inoperative.
