User Manual

Initial Power Up – continued
PRELIMINARY
SC 4812ETL BTS Optimization/ATP
08/15/2000
2-4
Failure to properly connect the external AC power cable
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 external AC power to
the cabinet. Once power is applied, a series of AC Voltage measurements
is required.
Table 2-3: AC Voltage Measurements
Step Action
1 Gain access to the ACLC external power connection terminals from the rear of the cabinet by opening
the power entry compartment access door and removing the ACLC rear cover (see Figure 2-2).
2 Measure the AC voltage from terminal L1 to neutral. Voltage should be in the nominal range of 115 to
120 Vac.
3 Measure the AC voltage from terminal L1 to ground. Voltage should be in the nominal range of 115 to
120 Vac.
4 Measure the AC voltage from terminal L2 to neutral. Voltage should be in the nominal range of 115 to
120 Vac.
5 Measure the AC voltage from terminal L2 to ground. Voltage should be in the nominal range of 115 to
120 Vac.
6 Measure L1 – L2 – should be from 208 to 240 Vac.
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 cabinet WILL be
damaged if the Main breaker is turned on with excessive
voltage on the inputs.
CAUTION
2