Motor Protection - Toshiba Q9 Installation And Operation Manual

Motor Protection

Motor circuit protection is accomplished using circuit breakers that have adjustable trip thresholds. The
threshold settings must be properly matched to the motor being driven and the application. The circuit
breakers are set to the minimum current value of the circuit breaker at the factory and must be adjusted for
the motor being used and to properly match the requirements of the application.
The motor protection hardware is comprised of a Motor Circuit Protector (MCP) at the 3-phase system
input and an Overload Circuit Protector (OCP) connected to the motor (see Figure 7 on pg. 29).
Overload settings are application-specific and should be set and/or adjusted by Qualified Personnel
ONLY.
The MCP that is used on the L1, L2, and L3 input power lines has a Shunt Trip feature which may be
used to further enhance the system protection function of the Q9 F S . The Shunt Trip feature may
LOW AVER
be connected such that the L1, L2, and L3 MCP may be opened by a state change of the LS switch. The
LS switch may be operated by an ancillary circuit or relay. If an ancillary circuit is experiencing a
condition which warrants a system shutdown (e.g., door is opened), the L1, L2, and L3 MCP will be
opened by the completed Shunt Trip circuit. During normal operation the Shunt Trip circuit is open.
R e a d an d u n d e rs tan d al l s af e t y w ar n i n g s b e f o r e o p e r at in g t h i s e q u ip m en t !
Q9 FlowSaver Installation and Operation Manual 15
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