Integrated bypass contactor
VMX Series System Protection
World-class motor & system protection…
in a soft starter that is easy to install, easy to wire & easy to use
Separate Start & Run Overload Protection
Two programmable overload trip 100%. curves allow for the thermal capacity required to start the load, while providing more closely matched overload protection during the run time.
Real-Time Thermal Modeling
A dynamic thermal register continuously calculates motor operating temperature even when your motor is not running. Knows when the motor is cool enough for a successful restart.
Retentive Thermal Memory
Remembers the motor thermal condition even in the event of a power loss or blackout. Extrapolates motor temperatures using a real-time clock.
Dynamic Reset Capacity
Overload will not reset until thermal capacity in the motor is sufficient for a successful restart. Starter learns and retains this information from previous starts.
Duty Cycle Protection
- Back-spin timer ensures coast-down before restart
- Minimum time between starts lock-out
- Starts-per-hour lockout to prevent motor damage
Equipment ground fault trip and monitoring (residual current method)
PTC thermistor input for use on motors with embedded PTC temperature sensors
Current imbalance trip and biasing of the thermal register
Phase loss protection based on current and voltage
Electronic shear pin trip (overcurrent) with trip delay
Load loss trip (under current) with trip delay
Phase rotation protection
Pre-start shorted load protection checks for motor lead or winding damage
Running short circuit trip acts like a high speed “electronic fuse”
Shorted SCR lockout, defeatable for “must run” situations
Bypass discrepancy monitoring ensures the Bypass Contactor closes
Over temperature trip keeps track of heat sink temperature to avoid SCR damage
Shunt trip detects welded contactor or multiple shorted SCRs (when used with shunt trip breaker)
Remaining thermal capacity metering, to predict overloads
Metering of A, B, C phase and ground fault currents