VMX
2
Series Digital Solid State Soft Starter User Manual
2 |
P a g e
1.1.2
Advanced Motor Protection Features
Thermal Model Electronic
Overload Protection
A sophisticated Thermal Model of the motor operation is created in the
microprocessor to accurately track all starting, stopping, and running conditions,
thus, providing maximum motor protection.
Two Stage
Overload Curves
Starting: Programmable for Class 5 through 30
Run: Programmable for Class 5 through 30 when "At-Speed" is detected.
Overload Reset
Manual (default) or automatic.
Retentive Thermal Memory
Overload circuit retains thermal condition of the motor regardless of control
power status. Unit uses real time clock to adjust for off time.
Dynamic Reset Capacity
Overload will not reset until thermal capacity available in the motor is enough for
a successful restart. Starter learns and retains this information by monitoring
previous successful starts.
Current Imbalance Trip
Trip Level: 5 - 30% Imbalance in any two phases.
Trip Delay: 1 -20 seconds.
Over Current Trip
(Electronic Shear Pin)
Trip Level: 100 - 300% of FLA
Trip Delay: 1 - 20 seconds
Voltage Protection
Over Voltage Trip Level: 1 - 10% of Line Voltage.
Under Voltage Trip Level: 1 - 20% of Line Voltage.
Separate Under Voltage levels for Start and Run modes.
Voltage Imbalance Trip Level: 1 - 30% Phase Difference.
Voltage Imbalance Trip Delays: 1 - 20 seconds.
Phase Loss
Phase Loss trip: Any phase current less than 12% of unit CT value.
Can be disabled in programming for testing with smaller loads.
Phase Rotation
Phase Rotation Trip: ABC, ACB or insensitive.
Phase Protection Trip Delays: 1 - 3 seconds.
Power Protection
Motor kW Trip Settings: Over / Under Trip.
Under kW Trip Level: 20 - 100% of calculated motor kW.
kW Trip Delay: 1 - 9999 minutes.
PF Trip Setting: Lead, Lag or Lead/Lag.
PF Trip Level: 0.01 -
1.0 (cos. θ).
PF Trip Delay Time 1 - 2 seconds.
Equipment Ground Fault
Protection
Type: Residual Current Method.
Range: 5 - 90% of unit CT ratio.
Trip Delay: 1 - 60 seconds.
Load Loss Trip
Under Current Trip Level: 10 - 90% of motor FLA.
Trip Delay: 1 - 60 seconds.
Coast Down (Back Spin)
Lockout Timer
Prevents restart when motor may be spinning backwards.
Coast Down Time Range: 1 - 3600 seconds.
Starts-per-hour Lockout
1 - 10 successful starts per hour.
Minimum Time between
Starts Lockout
Range: 1 - 60 minutes between start attempts.
Restart Delay
Sequential Start Feature for restarting delay after a power outage ends.
1-999 seconds after a power loss.
Auto Reset
Can be programmed to attempt resetting after selected faults.
0 - 10 Attempts, in 1 minute cycles.
Power Device Monitoring
Shorted SCR Lockout (1 shorted SCR) and independent Shunt Trip (multiple
shorted SCRs). Can be disabled in programming.
