GE GFK-0787B Noise Reduction Machine User Manual


 
8
8-17GFK-0787B Chapter 8 Installation Information
Output Wiring for a 32-Circuit, 4-Block Group (continued)
Output Load Considerations for 32-Circuit 4-Block “H” 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.