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RTU-292 Operations Manual
2.6 POWER REQUIREMENTS
The RTU-292 is designed to operate from 115V or 230V, 47 to 63 Hz, single phase AC power
source. The unit will meet all of its specifications over a voltage range of +15% from nominal.
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 INPUT POWER SELECTION
2.7.1 LINE VOLTAGE SELECTION
CAUTION
To prevent damage to the unit, check the power line voltage selection before
applying power. Also be certain that the unit is connected to a grounded outlet.
As shipped from the factory, the RTU-292 is normally set for the correct line voltage in the
area where it will be installed, but the voltage selection should be checked before initial
operation. The number visible through the window in the line power module (located on the
rear panel) indicates the nominal line voltage range in the following manner:
100 or 120 position: nominal 115V operation
220 or 240 position: nominal 230V operation
(The number will be easier to see if the clear fuse cover is slid to the left with the line cord
removed.) To change the voltage selection, remove the line power cord and slide the clear
plastic fuse cover to the left, exposing the fuse. Pull the small handle marked “Fuse Pull”,
rotate the handle to the left and remove the fuse. With the “Fuse Pull” handle to the left, pull
the voltage selector card from its slot and replace it with the desired operating voltage
appearing at the top left side. Rotate the “Fuse Pull” handle back to the right and snap the fuse
back into the metal clips.
The fuse should be either:
115V operation: 1 A time-delay fuse
230V operation: 1/2 A time-delay fuse
To replace a blown fuse, follow the same general procedure, except that the voltage selector
card need not be removed.
2.7.2 DC INPUT POWER SELECTION
Internal slide switch S6 is used to configure the RTU-292 to accept DC power from a (nominal)
+12 or +24/+28 VDC source. The +12/+28 VDC position will work with +24 VDC (nominal
JPS Communications, Inc.
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