8

Output Wiring for a 32-Circuit, 4-Block Group (continued)

Output Load Considerations for 32-Circuit 4-Block ªHº Pattern Redun- dant Output Groups

Minimum load:

1.0 milliamp

Maximum load:

0.5 Amp

Maximum inrush current:

4 Amps for up to 10 milliseconds

Maximum total load for block group:

16 Amps at 35 degrees C

Output Off Leakage Current:

20 microamps

For Outputs to be Autotested:

 

Minimum pickup time:

Greater than 1 millisecond

Minimum dropout time:

Greater than 1 millisecond

Caution

Check the characteristics of each output device against the list above to verify that it can be autotested and/or used in the 4-block output group. Otherwise, critical output loads could be adversely affected.

Output Autotest and Pulse Testing

If output circuits are to be autotested, the loads will be subject to pulse testing, which is an integral part of the output autotest sequence. Pulse testing verifies the ability of a block's outputs to change state with a short pulse that is not intended to affect the actual load. Pulse testing occurs whether the output is in the On state or in the Off state by executing one of two tests. These are the pulse ON±OFF±ON test and the pulse OFF±ON±OFF test. Outputs that are to be autotested must be able to withstand On and Off pulse times of approximately 1 millisecond.

GFK-0787B

Chapter 8 Installation Information

8-17

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GE GFK-0787B user manual Milliamp