Instruction manual
ACU-1000 Operations Manual
2-6 Interoperability Now
2.6 AC Power Requirements
The ACU-1000 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. The AC power consumption is 80 VA typical, 100 VA maximum.
The ACU-1000 is a microprocessor-controlled device. As with any such equipment, a very
short loss of AC Power can cause operational problems and/or cause the unit to reset.
Raytheon recommends that the ACU-1000 be connected to an AC power source that utilizes an
uninterruptible power system (UPS). If the overall site does not have UPS protection, the unit
should be plugged into a smaller UPS, such as those used for personal computer systems
2.6.1 AC Line Voltage Selection
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As shipped from the factory, the ACU-1000 is normally set for the 115 VAC, but if stipulated
on the Purchase order, the unit will instead be configured for 230 VAC. However, the voltage
selection should always be checked before initial operation. The number visible at the bottom
of the AC Power Input Module (located on the rear panel – See Figure 2-2 Control and
Connector Locations) indicates the nominal line voltage range in the following manner:
110 position: nominal 115V Operation
220 position: nominal 230V operation
Note that if the AC Voltage selection is changed, the AC fuse must also be changed. To
change the voltage selection, first remove the line power cord, and then use a small flat blade
screwdriver to slide the fuse assembly out. A tab on the fuse assembly prevents its removal
unless the power cord is disconnected, and the slot that’s used when sliding the assembly out is
only accessible when the cord is disconnected. Remove the fuse from the base of the assembly
and replace with the correct fuse. Now use the screwdriver to push open the drawer in the fuse
assembly and replace the spare fuse with a spare that corresponds with the AC line voltage.
Slide the fuse assembly back into the AC Power Input Module, making sure that it is fully
seated.
Finally, use the screwdriver to switch the line voltage selection to the correct position and
reconnect the AC power cord.
Nominal 115V Operation- Use 250V, 3 amp, T (time delay)
Nominal 230V Operation- Use 250V, 1.6 amp, T (time delay)
To replace a blown fuse, follow the same procedure using the spare fuse in the drawer.