3 Operating the Power Supply Locally
Power Supply OK Signal
The Power Supply OK signal on the J1 connector indicates a fault condition in the power supply. J1 pin 16 is a TTL output signal. Pins 2 and 3, which are connected internally, are the signal common. All pins are optically isolated from the power supply output. With no fault, Power Supply OK is high, with a maximum source current of 2mA. When a fault occurs, Power Supply OK is low, with a maximum sink current of 1mA. The following faults set this signal low:
Enable/Disable signal true Shut Off signal true Remote interface failure Output turned off
Daisy-Chained Output Shut-down
It is possible to configure a multiple power supply system to shut down all the units when a fault condition occurs in one of the units. SW1 setup switch 5 must be in the Down position to enable the daisy- chain operation. Other switches are unaffected by this setting.
If a fault occurs in one unit, its Power Supply OK signal is set low and its display will indicate the fault. The other units shut off with their displays indicating SO. When the fault condition is cleared, all units will recover according to their
The following figure shows three units
POWER SUPPLY
#1
Com | Supply OK | Shut Off |
POWER SUPPLY |
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| #2 |
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Com |
| Supply OK | Shut Off | ||
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POWER SUPPLY
#3
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Com |
| Supply OK Shut Off | ||
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Analog Programming of Output Voltage and Current
| J1 pin 12, pin 22, and pin 23 are internally connected to the negative sense | |
CAUTION | ||
terminal. Do not reference these pins to any terminal other than the negative | ||
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| sense terminal, as it may damage the unit. | |
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| In Local mode, the output voltage and current is programmed with | |
| the front panel VOLTAGE and CURRENT knobs or over the remote | |
| interface. In Analog mode, the output voltage and current can be | |
| programmed either by an analog voltage or by resistors connected to | |
| the rear panel J1 connector. |
42 | Series N5700 User’s Guide |