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RTU-292C Operations Manual
2-5
2.6
POWER REQUIREMENTS
The RTU-292C’s external supply requires a single-phase AC power source and operates on an
input range of 90 to 270 VAC, with input frequency from 47 to 63 Hz. Power consumption is
20 VA typical, 50 VA maximum.
Alternatively, the unit may be operated from a (nominal) +12, +24, or +28 VDC supply. At the
+12VDC setting, the unit will operate from +11 to +15VDC, and at the +24/+28 VDC setting,
the unit will operate from +22 to +30 VDC. Slide switch S6 on the Main Board selects either
+12 or +24/+28 VDC.
2.7
POWER SELECTION
2.7.1
LINE VOLTAGE SELECTION
The external power supply provided with the RTU-292C operates from 90 to 270 VAC and
therefore does not require any switch settings for proper operation.
2.7.2
DC INPUT POWER SELECTION
Internal slide switch S6 is used to configure the RTU-292C to accept DC power from a (nominal)
+12 or +24/+28 VDC source. The +12/+28 VDC position will work with +24 VDC (nominal
and +28 VDC (nominal) supplies. The unit will automatically switch over to the use of the DC
input when the AC source drops too low or is not available. Slide switch S6 on the Main Board
is used to select 12 or +24/+28 VDC operation. S1 is located near the left front edge of
the Main Board; the +12V and +24/+28V switch positions are clearly marked on the board. The
RTU-292C is set in the factory to the +24/+28 VDC position.
CAUTION: Always disconnect both the AC and DC input power cabling
from the SNV-12 prior to servicing the unit.
2.7.3
FUSE INFORMATION
Three fuses are used in the RTU-292C. F2 fuses the DC input and is located on the inside of the
rear panel. It can only be accessed with the top cover removed. F3 and F4 fuse the telephone
line input; they are located on the main PCB. There is no fuse labeled F1.
Table 2-2
RTU-292C Fuses
F2
5AF 250V, 3AG
DC Input
DC Power Input Fuse
F3, F4 800mA 250V microfuse
TNV Input
TNV (phone line) circuit protection
Содержание RTU-292C
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