Motor Circuit Protector Adjustment And Setting - Toshiba Q9 Plus Bypass ASD Installation & Operation Manual

Motor Circuit Protector Adjustment and Setting

The trip threshold of the MCP is set to the lowest setting when the product ships from the factory. Refer
to the NEC Table 430-152 for recommendations and guidelines on establishing the proper MCP setting
for a given application. With the vast number of application system variables, the MCP may have to be
set as a reference, tested, and adjusted up or down until the desired result is achieved.
When using a Design E motor, the setting for the instantaneous trip circuit breaker shall not be more
than 1100% of the full-load input current. The maximum setting for a motor, other than Design E, shall
be 800% of the input current. This is done to ensure that the protection does not activate while starting
the motor but is able to provide adequate protection for a fault condition.
Overload settings are application-specific and should be set and/or adjusted by Qualified Personnel
ONLY (see Qualified Personnel on pg. 2).
Figure 3. MCP Adjustment.
Set to minimum at the factory. Application-specific adjustment is required.
18 Q9 Plus Bypass ASD/Bypass Box Installation and Operation Manual