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1. INTRODUCTION
1.3.2 Interior (Figure 1.2)
Battery Circuit Breaker
This circuit breaker connects or disconnects the batteries. For normal
operation, it must be ON.
Control and Display Panel
This panel provides vital information about the UPS’s performance and provides
management functions. More information is given in Section 3.
RS–232 Serial Interface
This connects the UPS to the host computer for remote servicing, control and
calibration. More information is given in Section 4.
The serial cable is available from Alpha Technologies:
•
870–540–21, Cable assembly, Nexsys PC, RS–232, DE–9 Male to DB–25
Female.
•
870–540–22, Cable assembly, Nexsys PC, RS–232, DE–9 Male to DE–9
Female.
Battery Connector
This connects the batteries to the UPS.
Temperature Sensor
This sensor measures the battery's temperature. The charging current is
temperature dependent.
Internal Fan Connector
This connects the internal fan to the UPS.
Batteries
They provide the backup power.
Terminal Block
This terminal block is the UPS's input and output. If used, the external alarm
panel is connected here.
There are two types of terminal blocks used: The P1250 (Section 1.4) and the
1250T (Section 1.5).
Shelf Attachment Screws
These two screws secure the shelf to the rear enclosure.
1.3 A Tour of the Alpha P1250 and 1250T
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