User's Manual Part 2

Initial Power Up – continued

DRAFT

SC4812ET BTS Optimization/ATP — CDMA LMF

Apr 2001

2-4

Failure to connect the proper AC feed will damage the

surge protection module inside the AC load center.

CAUTION

Power Up Sequence

The first task in the power up sequence is to apply AC power to the

Power cabinet. Once power is applied a series of AC Voltage

measurements is required.

Table 2-3: AC Voltage Measurements

Step Action

1 Measure the AC voltages connected to the AC load center (access the terminals from the rear of the

cabinet after removing the AC load center rear panel). See Figure 2-2.

2 Measure the AC voltage from terminal L1 to neutral. This voltage should be in the range of nominally

115 to 120 V AC.

3 Measure the AC voltage from terminal L1 to ground. This voltage should be in the range of nominally

115 to 120 V AC.

4 Measure the AC voltage from terminal L2 to neutral. This voltage should be in the range of nominally

115 to 120 V AC.

5 Measure the AC voltage from terminal L2 to ground. This voltage should be in the range of nominally

115 to 120 V AC.

6 Measure L1 – L2 – should be from 208 to 240 V AC.

If the AC voltages are in excess of 120 V (or exceed

200 V) when measuring between terminals L1 or L2 to

neutral or ground, STOP and Do Not proceed until the

cause of the higher voltages are determined. The power

cabinet WILL be damaged if the Main breaker is turned

on with excessive voltage on the inputs.

CAUTION