Motor Protection - Toshiba Q9 Plus Bypass ASD Installation & Operation Manual

Read and understand all safety warnings before operating this equipment!

Motor Protection

Motor circuit protection is accomplished using circuit breakers that have adjustable trip thresholds. 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 driven and the requirements of the application.
The motor protection hardware is comprised of a Motor Circuit Protector (MCP) at the three-phase
system input and an Overload Circuit Protector (OCP) connected to the motor (see Figure 7 on pg. 31).
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 that may be used
to further enhance the system protection function of the Q9 Plus Bypass ASD/Q9 Plus Bypass Box. The
Shunt Trip feature may 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 that 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.
Should the Shunt Trip circuit activate and terminate the three-phase input power, a manual reset is
required to resume normal system operation.
Q9 Plus Bypass ASD/Bypass Box Installation and Operation Manual 17