Controlling The Output With An External Signal - HP E1135C Operating And Service Manual

OPERATING DESCRIPTIONS
J1
1 LINE
2 LAMP
3 LAMP / W 30K
4 LOAD
J1
1 LINE
2 LAMP
3 LAMP / W 30K
4 LOAD
J1
1 LINE
2 LAMP
3 LAMP / W 30K
4 LOAD
Figure 7. Wiring a Remote Output Enable Switch

Controlling the Output with an External Signal

To control the output using an external low-level dc signal, the PDU must be set up as a
Branch PDU, which means that it is set up to be controlled by another PDU (page 18).
Set the Main/Branch Switch (S2) to the Branch position (page 9). With no Outputs Enable
Switch wired to the PDU (J1), connect the external control wires to J2 pins 1 (+) and 2 (-). A
twisted-pair or shielded cable works best for noise immunity. A voltage greater than 3 volts (at
500 microamps) will turn the PDU's outputs on; less than 3 volts turns the outputs off. The
voltage must not exceed 100 volts.
When the outputs are on, an isolated signal between 10 and 15 volts dc is present at J2 pins
3 (+) and 4 (-). This signal can be used to control other PDUs.
HP E1135C POWER DISTRIBUTION UNIT Rev. C
14
Switch
Switch Only
Switch
Switch with Internal
Lamp rated at 125
Lamp
volts ac
Switch
Switch with Internal
Res Lamp
Lamp rated at 250
volts ac
ENABLE1.WPG