TSO-C73 STATIC INVERTER
400Hz 500 VA

The SC50 is a lightweight, static inverter that utilizes the latest state of the art, solid state circuitry to invert a 28 VDC input to a 115 VAC, 400 Hz sine wave output.

Design features include a crystal controlled oscillator for output frequency stability and a pulse-width-modulated square to sine wave power conversion scheme for efficient and reliable operation.

The SC50 is primarily designed to power airborne and ground instruments, compasses, gyros, radars and navigation equipment.

Input Voltage
28 VDC. (nominal). 20 VDC to 36.5 VDC range.

Input Current
20.7 ADC at full load. 0.5 ADC at no load.

Output Voltage #1, #2
+5%, -7% (±2% typ. on 115 V).

• 15 VAC
• 26 VAC

Output Power - 15Vac, 26Vac
500 VA total of 115 V & 26 V.

• 500 VA
• 100 VA

Output Frequency
400 Hz ± 1.0 Hz.

Phase & Waveform
Single phase & sinusoidal.

Harmonic Distortion
0.7% (nominal), 3% max.

Power Factor
+.8 to -.8

Efficiency
87% (nominal).

Regulation
1% Line, 1% Load, 2.5% Temp.

Weight
4.9 lb. (2.22 kg)

Response Time
300 Usec (NL to FL)

Overload Capacity
110% of rated output power for 2 hrs 150% of rated output power for 5 min

Protection Circuits
The inverter will shutdown under the following conditions:

• Input Voltage >37.5 VDC ±1.0 VDC
• Input Voltage < 18.0 VDC ±1.5 VDC
• Internal high ambient temperature.
• Output short circuit condition.

Remote On/Off
Yes. Ground Pin E to turn ON

Operating Temp
-55° C to +71° C (-65° F to+160° F)

Altitude
55,000ft.

Environment
RTCA DO- 160C env. cat. F2ZBB(LV)XXXXXXBXAXXXZXXX

Cooling
Thermostatically controlled brushless fan.

Compliance
FAA TSO-C73