Overload Module; Terminal Boards - Hobart 140GT17P Operation And Maintenance Manual With Illustrated Parts List

OM-2029

(4) Overload module

Each output of the generator set has an overload module (item 13 for No. 1 output, or item 14
for No. 2 output). Each overload module is a solid-state device designed to interpret a signal
from a set of overload current transformers (item 5 for No. 1 output, or item 5 for No. 2 output)
and to send a signal to the protective monitor module when an overload condition exists in
any generator output phase. A pull-apart electrical connector is mounted on the overload mod-
ule to provide quick-disconnect facilities for all wiring to a module. Each overload module is
equipped with a hermetically-sealed, reed-type relay. Relay contacts are normally open. The
solid-state circuitry is designed to close relay contacts when output current in ANY phase
reaches 125% of normal rated output capacity. The closed relay sends a signal to the protec-
tive monitor. This signal "gates" the overload SCR (silicone-controlled rectifier) in the protec-
tive monitor and interrupts the load contactor holding circuit, allowing the load contactor to
open.
The following is a list of overload module characteristics:
NOTE : The overload protective system will function when any phase carries 123% to 127% of rated load.
• At 125% load the module will function in 5 minutes.
• At 150% load the module will function in 16 seconds.
• At 200% load the module will function in 4 seconds.
NOTE : All times are plus or minus 25% and are nonadjustable.

(5) Terminal boards

Two terminal boards (7) provide connection facilities for small leads.
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September 30/89 Revised