PRECISION FILTERS Precision 28000 - 28002 Power Supply; 28004-ACPS-X Power Supply; Changing a Fuse: 28004-ACPS-X

Maintenance and Troubleshooting
Page 74
28000 Signal Conditioning Installation Instructions Precision Filters, Inc.
Rev. B
All 28000 systems are congured with the proper power supply line voltage requirements
and fuse(s) for your country when shipped from the factory, unless other requirements are
specied.
3.2.2 28002 Power Supply
The 28002 power supply has no replaceable fuses or parts.
3.2.3 28004-ACPS-X Power Supply
The 28004-ACPS-X power supply powers Precision 28004-M3/M5 4-card slot mainframes
and is available in two variations: 15 VAC with an operating range of 104 to 126 VAC and 230
VAC with an operating range of 207 to 253 VAC input power line voltage.
Table 21 lists the line voltage and fuse requirements for each model number.
Table 21 28004-ACPS-X Model Number Chart
Model Line Voltage ±10% Fuse 5X20 SLO-BLO
28004-ACPS-1 115 VAC 3 A 250V (1)
28004-ACPS-2 230 VAC 1.5 A 250V (2)
Changing a Fuse: 28004-ACPS-X
Fuses are located in the fuse drawer behind the fuse door on power entry module on the rear
panel. See Figure 51.
J502
SIGNAL
GROUND
CHASSIS
GROUND
PRIMARY POWER
SWITCH/CONNECTOR
J500 J501
Primary Power
Switch
Power Entry
Module
AC Power
Connector
Fuse
Drawer
Figure 51 28004 Rear Panel Power Entry Module
Step 1 Switch the front-panel power switch to the Off position and switch the rear-panel
primary power switch to the Off position.
Step 2
Remove the AC power cord from the AC power connector.
Step 3 Open the fuse door. Insert a small at-head screwdriver into one of the two slots
on right of the fuse holder door and loosen. Use the second slot to free the door and
then swing the door to the left. See Figure 52.