16
Appendix 2:
Operating
Voltages
and Fuses
The Model 3211 can operate from 100, 120, 220, or
240 V AC with AC frequencies of 47–63 Hz. The
unit is configured at the factory for the standard
AC voltage in the user’s country. To select a differ-
ent operating voltage, please refer to Fig. 4 and fol-
low the directions below:
1. Disconnect the power cord.
2. Open the cover of the power entry module on
the rear panel with a small blade screwdriver or
similar tool.
3. Insert the tool into the voltage selection slot and
remove the wheel from the unit.
4. Turn the wheel and re-insert into the module so
the desired voltage is shown.
NOTE:
Do not attempt to rotate the wheel while it
is still in the power entry module; the wheel must
be removed, turned, and then re-inserted.
5. Close the cover.
6. Verify that the proper voltage is showing through
the module’s window.
The power entry module requires two 5x20-mm,
slow-blow fuses, such as Littlefuse’s
®
Slo-Blo
®
239
Series: one for the hot line and the other for the
neutral line. Replacement fuses should be as follows:
AC Voltage
Fuse Rating
Little Fuse
100 V AC
1.6 A
239 01.6
120 V AC
1.6 A
239 01.6
220 V AC
0.8 A
239.800
240 V AC
0.8 A
239.800
