The Line Monitoring Function; Line Sags And Drop-Outs; Line Surges - HP E1135C Operating And Service Manual

The Line Monitoring Function

As long as the Mains Disconnect Switch is closed — applying power to the Control Board
— the line (ac mains) is continuously monitored by the PDU. If the line voltage exceeds the
factory-set limits shown in Table 4 for more than one cycle, the Line/EMO Error Indicator will
light and you will not be able to turn the outputs on. If the Voltage Selector Switch (S1) is not
in the correct position (page 10), the monitoring circuit will treat it as a high- or low-line
condition.
Table 4. Line Monitoring Limits at PDU Turn-on
S1 = 115V
Low Limit 90.5 Vac ± 3%
High Limit 133.5 Vac ± 3%

Line Sags and Drop-outs

If the line sags below the low limit for more than one cycle, the contactor will open and there
will not be power to switched loads, and the Line/EMO Error Indicator will light. If the line
subsequently returns to normal, the outputs will remain off and the Line/EMO Error Indicator will
remain lit. To reset the PDU, switch the Outputs Enable Switch off for at least 15 seconds and
then on again; this will restore the output.
If the line drops to zero volts for more than 10 seconds, the outputs of the PDU will come
back on when power is restored. A line interrupt of less than 10 seconds is treated as a sag.

Line Surges

Once the outputs of the PDU are turned on, line surges will not affect the PDU unless they
are about 20 percent over the high limits of Table 4. Then, if the surge lasts longer than one
cycle, the outputs will be turned off and the Line/EMO Error Indicator will light. If the line
subsequently returns to normal, the outputs will remain off and the Line/EMO Error Indicator will
remain lit. To reset the PDU, switch the Outputs Enable Switch off for at least 15 seconds and
then on again; this will restore the output.
OPERATING DESCRIPTIONS
S1 = 230V
181 Vac ± 3%
267 Vac ± 3%
HP E1135C POWER DISTRIBUTION UNIT Rev. C
Frequency
47–63 Hz
47–63 Hz
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