Rockwell Automation 1519 MV DRIVE HARMONIC FILTER PF CORRECTION UNIT - Manual (Page 12)


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2-2 Physical Layout and Component Identification
Component Identification 592 Overload Relay
and Functional Descriptions
(cont.)
A Bulletin 592 thermal overload relay is used to prevent an excessive current
condition in the reactor and capacitors. This is a manually reset, eutectic alloy-
type device. The ratchet stud assembly is heated by current flowing through
the heater element. Relay operation occurs when the temperature of the ratchet
stud reaches the melting point of the eutectic alloy, freeing the ratchet wheel
and opening the normally closed contact.
Reset Relay/Pushbutton
The reset relay is used to latch in a fault that occurs on the harmonic filter.
The reactor thermal switches, 592 overload contact, and SMP-3 relay contact
for a filter leg are wired in series with the reset relay. When one of these
devices operates the reset relay latches open until the individual device(s) are
reset and the reset pushbutton associated with the reset relay is depressed.
Surge Suppressor
Acts to reduce voltage transients associated with de-energization of a reset
relay coil.
Cooling fan
Each cabinet has two continuously running cooling fans each with a 550 CFM
capacity. They are supplied either 110/120 V or 220 V depending on the
control voltage available. The fans are oriented to blow air out of the top,
forward-facing vent.
Strip Heater and Thermostat (Optional)
Strip heaters are located in each cabinet for preventing condensation which
may occur if the cabinet temperature is lower than the ambient temperature.
They are available for either a 110/120 V or 220 V separate source.