Front Panel Operation - 4

4 - Setting a Protection Feature

You can set the ac source to disable its output if it detects an overvoltage or overcurrent fault condition. Other automatic fault conditions (such as overtemperature) also will disable the output. Set the

overcurrent protection feature as follows:

 

Action

Display

1.

On the Function keypad, press Protect.

PROT:CLEAR

2.

Press ° to obtain the overcurrent command.

CURR:PROT OFF

3.

On the Entry keypad, press once to scroll to the ON parameter and press Enter. The

CURR:PROT ON

 

OCP annunciator will light, indicating that the overcurrent protection circuit is on.

 

 

CURR:PROT ON

 

 

If you wish to set a time delay between the detection of the fault and the disabling of

DELAY .1

 

the output, scroll to the delay command on the protection menu. The default delay is

 

 

100 milliseconds.

 

Enter the delay from the Entry keypad, such as . 2 5 0 Enter.

4.When you want to restore normal operation after the cause of the overcurrent condition has been removed, scroll to the protection clear command and press Enter. The OCP annunciator then will go off.

DELAY .250 PROT:CLEAR

5 - Clearing Protection Conditions

When the output Prot annunciator is on, the output of the ac source has turned off due to one or more of the following conditions:

Annunciator

OV

OCP

SOA

OT

RI

Rail

Action

Description

overvoltage protection has tripped rms overcurrent protection has tripped safe operating area has tripped overtemperature protection has tripped

an external remote inhibit signal has occurred rail protection has tripped

Bit Number

0

1

2

4

9

11

Bit Weight

1

2

4

16

512

2048

Display

1.You must first identify the cause of the protection shutdown, and then eliminate its cause before you can continue operating the unit.

2.To identify the problem, press Shift Status.

3.Press to obtain the Questionable Event command.

4.Press Enter to find out which bits have been set in the Event Register.

Note: The value returned is the sum of all of the binary weights of the bits that have been set. For example, a value of 20 indicates that bit 2 (bit weight=4) and bit 4 (bit weight=16) have been set. Refer to the previous table for the bits and bit weights that are assigned to the protection conditions. Refer to the following table for information on eliminating the couse of the protection condition. Refer to Chapter 4 in the ac source Programming Guide for a complete discussion of the status system.

*CLS

QUES:EVEN?

QUES:EVEN 20

49

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Agilent Technologies 6811B, 6813B, 6812B manual Setting a Protection Feature, Clearing Protection Conditions, Annunciator
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