HP 3000 III Series Manual page 382

Rated
Vol tage
System Installation
Table 11-5. Primary Power Voltage Tolerances
---------------r---------------------------------
I
Acceptable Steady-State Voltage
1
I-----------------r---------------
1
From
1
To
1 1
---------------1-----------------1---------------
200
1
180.0
1
208.0
208
·1
187.2
I
216.32
220
I
198.0
I
228.8
230
I
207.0
1
239.2
240
I
216.0
I
249.6
1 I
Note: In general, peripherals not receiving
power via the CPU bay Power Control Mod-
ule require a steady-state line voltage
from 10 3 • 5V to 119. 6V for 60- Hz site sand
from 207.0V to 239.2V for 50-Hz sites.
However, various power options are avail-
able for most HP peripherals. Regardless
of the peripheral power option ordered,
the available steady-state voltage must
be within the limits of +4/-10 percent of
the rated vol tage.
d. Remove the isolation transformer primary side cover plate
shown in figure 11-6.
WARNING
Ensure that all Power ·Control
~dule
circuit
breakers are set their OFF positions and that
the main power cable is not connected to the
power source. Failure to comply may resul t
in serious injury or death.
e. Using figure 11-6 as a guide, check that the isolation trans-
former is correctly strapped for the primary power rated vol-
tage available at the site. If necessary, restrap the isola-
tion transformer for the available RATED voltage (not the
actual STEADY-STATE voltage measured in step a) •
The isolation transformer must always be strapped for the
available RATED voltage and not for the actual STEADY-STATE
voltage measured in step a. For example, if the site RATED
vol tage is 208 VAC ana the measured STEADY-STATE vol tage is
216 VAC, strap the isolation transformer for the RATED volt-
age of 208 VAC even though the STEADY-STATE voltage of 216
VAC seems to indicate strapping for 220 VAC. Thecornputer
site must be wired to provide a RATED primary power source
11-16