Output Specifications; Other Specifications; Adjusted Parts - Furuno Felcom 250 Service Manual

1. Output Specifications

Output voltage
Output voltage range
Current capacity
Output overcurrent protection

2. Other Specifications

1) Power supply input low-voltage protection: +8.5 VDC(activated at +10.2 VDC)
2) Power supply input over-voltage protection: +36 VDC
3) Power supply reverse connection protection: The CR1 in the POWER board
It will blow fuse mounting on the power supply cable.
Make sure to replace the fuse by following the input power supply specifications. The
specifications are; for 12 VDC input, 15 A; for 24 VDC input, 8 A.
4) 48 VDC, 42 VDC, 5 VDC output voltage monitoring:
If any of the predefined voltage values gets to the 70% level or lower of the original
level for approx. 2 second or longer, the power supply will be shut down. When
abnormality is observed for the 48 VDC or the 5 VDC, the light for CR115 will turn
on, and when abnormality for the 42 VDC is observed, the light for CR 215 will turn
on.
5) Power efficiency: 80% or more

3. Adjusted Parts

The oscillating frequency for the switching regulator power supply is 70 kHz ± 1 kHz. The
oscillating frequency is measured by connecting a frequency counter between TP105 and
TP202 (GND).
TP202(GND)
Table 11.1.1 POWER board output specifications
48 VDC
47 to 49 V 41.2 to 42.8 V
0.63 A
0.82 A
TP105
R123: 70 kHz ADJ.
11-11
11.1 Communication unit: FB-2000
42 VDC 6 VDC
5.7 to 6.1 V
1.43 A 1.1 A
1.7 A 1.5 A
Fig. 11.1.8 POWER (16P0276) board
5 VDC
5.0 to 5.2 V
5 A
5.5 A
CR215 ON:
Voltage lowered to 42 V
CR115 ON:
Voltage lowered to
48 V or 5 V