SNV-12 Operations Manual
3-6
3.6
Power Requirements
The SNV-12 will accept either AC or DC power. If both are supplied simultaneously, the unit
will draw DC power only if the AC line sags. The yellow LEDs on the PSM module‟s front
panel will display the presence of AC and DC supply voltages. The LEDs do not indicate
which power source the SNV-12 is currently using.
3.6.1
AC Voltage
The SNV-12 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 50 VA typical, 100 VA maximum.
The SNV-12 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. The voting
system will be inoperable during the reset period. We recommend that the SNV-12 be
connected to an AC power source that utilizes an uninterruptible power system (UPS). If the
site does not have UPS capability, the SNV-12 should be plugged into a smaller UPS, such as
those used for personal computer systems
3.6.1.1
AC 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 SNV-12 is normally set for the correct 115 VAC unless
otherwise stipulated on the Purchase Order, but the voltage selection should be checked before
initial operation. The number visible at the bottom of the Power Interface Module (located on
the rear panel – See Figure 3-2) 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. 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 Power Interface 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.
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