Reliance electric 57C409, Instruction Manual

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O/A
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Figure 2.1 Ć Typical Input Circuit
There are 4 LED indicators on the faceplate of the module which
reflect the status of the onĆboard 4mhz clock. The top LED indicates
whether common clock, which can be generated from numerous
modules, is on. The next LED indicates whether this module is driving
the common clock. The bottom two LEDs are used for factory testing
purposes only and should be ignored by the user. See figure 2.2.