HP 3000 III Series Manual page 374

System Installation
11-4. Power Control Module
Perform the following instructions for the peM.
a. Remove the large and small panels (seen from the rear of the
CPU Bay) from the PCM. Save all hardware.
b. Verify that jumpers have been correctly installed on TBI and
TB2 as listed within figure 11-5.
c. Have an electrician perform this step. Connect primary ac
power cable wires to the PCM line filter terminals as shown
within figure 11-3.
d. Remove all ac power plugs from all ac power service strips in
the equipment bays.
e. Have an electrician perform this step. Be sure the ac power
at the Computer Mainframe Power Panel 'and PCM MAIN SYSTEM
POWER and PCU EXTENDED SYSTEM POWER circuit breakers are
turned OFF. Then, connect the other end of the primary ac
power cable wired in step c to the isolation transformer.
Then, turn ON the Computer Mainframe Power Panel main line.
f. Use a suitable voltmeter to check voltages at each of the PCM
line filter terminals for correct value as listed within fig-
ure 11-3.
g. Use a vol tmeter to check the vol tage between ground and neu-
tral. Voltage should not exceed I VAC (rros). Use an oscil-
loscope to check the ripple content of the waveform between
ground and neutral (must not exceed 25 mv p-p).
h. Check that the EMERGENCY OFF pushbutton at the top front of
the CPU Bay is lighted. If it is not, press it once. If it
fails to light, an error exists in that circuit. Do not
proceed further until the error has been corrected and the
pushbutton will light.
i. After confirming that the EMERGENCY OFF lamp lights, set the
PCM MAIN SYSTEM POw~R circuit breaker ON. Then, check the ac
power voltages at the ac power service strips throughout the
cabinets as shown in figure 11-1. If the voltages are in-
correct, set the PCM MAIN SYSTEM POWER and Computer Mainframe
Power Panel circuit breakers OFF and check the ac power ser-
vice strip within the PDU against table 11-3. If any errors
are found, correct them.
j. Set the PCM MAIN SYSTEM POWER circuit breaker to OFF and re-
place the access covers on all PDU's.
k. Connect all fans, card cages, and other devices in the cab-
inets into the appropriate ac power service strips and set
the PCM MAIN SYSTEM POWER circuit breaker to ON. Check that
all fans in the system operate.
11-8