1. INTRODUCTION
11
1.5
Nexsys UPS Rear Panel
Cooling Fans
This UPS uses cooling fans to ensure maximum cooling protection in all operating
modes.
External Battery Pack (EBP) Connector
This connector accepts a standard plug for an Alpha external battery pack which
extends available backup time. The UPS's smart charge system will automatically
select a higher charge current.
Nameplate Label
The nameplate label displays vital UPS information. Always verify the input
voltage and frequency (e.g., 120 VAC / 60 Hz) before using the UPS.
Communication/Alarm Interface Connector
This communication/alarm RS–232 interface connects to a host computer for
remote monitoring, control, and calibration of the UPS. A special serial cable to
connect the UPS to the computer is available from Alpha Technologies. The part
numbers for the cables are:
•
870-540-21
Cable Assembly, Nexsys–PC, RS–232, DE–9M to DB–25F
•
870-540-22
Cable Assembly, Nexsys–PC, RS–232, DE–9M to DE–9F
Input/Output Receptacle Plate
The standard Nexsys UPS comes with an input/output receptacle plate with the
following:
AC Input Circuit Breaker
The AC input circuit breaker automatically disconnects the UPS from the
utility line AC power if an overcurrent is applied to the UPS input.
AC Output Receptacles
The equipment to be protected is connected to these UPS output recep-
tacles. The style of the output receptacle varies, depending on country,
frequency, and voltage.
AC Line Cord Connector
An AC line cord is supplied with the UPS for North American customers.
Optional Terminal Block
A terminal block connection box can be used instead of the standard input/output
receptacle plate.
5. MAINTENANCE
50
IMPORTANT: Read the safety precautions at the front of this manual before
proceeding.
WARNING: Do not short out the battery terminals. Do not lay tools or parts on
top of the batteries. Do not allow tools or leads to contact the
chassis during assembly or disassembly.
WARNING: The UPS does not need to be shut off to change the batteries, but if
it does not have external batteries attached, and the input power
fails during the change out procedure, the output power of the UPS
will also fail. Do not change the batteries while operating critical
systems. The loads are not protected when changing internal
batteries without an external battery pack attached to the UPS.
Once a year, inspect the batteries for signs of cracks, leaks, or swelling and
always replace them with batteries of identical type and rating. Never install
old or untested batteries. Order batteries from Alpha Technologies.
The batteries are hot swappable. They can be changed without shutting off the
UPS.
Procedure:
For all models:
1.
If the UPS has an external battery pack attached and is running
properly, go to Step 3.
2.
Switch the UPS into Hot Swap mode by following the procedure in
Section 3.6.9, “Hot Swap Mode.”
3.
Undo the five screws that secure the front panel and swing the front
panel open.
For the Nexsys 600:
4.
Undo the two screws on the battery holding bracket. Remove the
battery holding bracket and the battery holding foam block.
5.
Unplug the red/blue battery connector. This disconnects the UPS from
internal battery power.
6.
Pull out the batteries about 2 inches (5 cm) and unscrew the battery
leads from the battery terminals. Wrap the leads in electrical tape to
prevent the leads from shorting.
7.
Remove the batteries from the chassis.
5.3
Internal Battery Replacement
