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Explains the basic principle and construction of induction-disk undervoltage relays.
Describes the protective function of these relays for closing trip or alarm circuits.
Details the behavior of the Type IAV54E relay, including its single closing contact and inverse time characteristics.
Specifies operating-circuit ratings, contact ratings, and current-carrying ratings based on tap selection.
Details the electrical burdens (volt-amps, power factor, watts) for various relay types at rated voltage.
Describes the relay case construction, mounting options, and internal connection points.
Provides guidance for installing the relay in a suitable location for inspection and testing.
Specifies that the relay should be mounted on a vertical surface and refers to drilling dimensions.
Details internal and external connection diagrams and grounding requirements.
Explains how to adjust the target, seal-in unit, and voltage settings using tap plugs and adjusting rings.
Describes how to set the time dial and adjust the permanent magnet for operational time.
Details what to inspect on the relay at the time of installation for proper functioning.
Provides steps for checking factory adjustments, dropout voltage, and performing tests.
Advises on maintaining factory adjustments and points to observe when restoring original settings.
Instructions for testing the lower jewel and ensuring proper disk centering in the air gap.
Recommends using a flexible burnishing tool for cleaning fine silver contacts to avoid damage.
Guidance on stocking and ordering replacement parts, specifying catalog numbers and bulletins.
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