SM500A—Automatic Switching System
Black Box Corporation
17
990-000-0001-E8
Figure 2.7. AC Redundant Power Supply unit (SM535A) rear panel
2.6.3 Installation Procedure
Mount the Chassis (SM535A), in the communication cabinet.
1. Check the slide switches located on the rear panel of each Power Supply Unit for proper
AC voltage selection—that is, 115 V (factory set) or 230 V. This procedure must be followed
to avoid damage to the Power Supply Unit.
2. Connect the two AC cords to the RS500 chassis. Verify that the two power indicator
LEDs are illuminated.
3. Connect up to eight supply cables (SM539) from the rear connectors on the AC
Redundant Power Supply chassis labeled SYS 1, . . . , SYS 8 to the corresponding chassis.
CAUTION BEFORE POWERING THE AC REDUNDANT POWER SUPPLY UNIT:
The AC Redundant Power Supply unit is factory set to 115VAC at both power inputs. For
230VAC operation, move the desired slide switch to the 230VAC setting and replace the fuses
with the ones supplied for use with 230VAC (.8A SB 230VAC).
2.6.4 Maintenance
No preventive or routine maintenance is required for the AC Redundant Power Supply. An
LED will indicate when one of the plug-in Power Supply Units is not functioning and
replacement is therefore necessary.
To replace plug-in Power Supply Unit (SM537):
1.
Unplug the AC cord from power source.
2.
Unscrew captive screws and remove the plug-in Power Supply Unit.
