50
2. When the motors output current exceeds 103%, of the motors protective electronic thermal
characteristics during the start operation. The T-verters protective (OL1) will allow operation of
the drive for 150% of rated current for one minute before shutting the T-verters output off.
Note:
To protect the motor under an HVAC load (Fan, Pump...etc.), when the motors output current
exceeds 113%, of the motors protective electronic thermal characteristics during the start
operation. The T-verters protective (OL1) will allow the drive to operate at 123% for one minute
before shutting the T-verters output off.
Constant Torque Loads:
With a constant torque load, the
torque loading is not a function of the
speed. This is a characteristic of
traction drives, conveyors, positive
displacement pumps, etc.
As the speed changes, the load torque
will remain constant and the
horsepower will change linearly with
the speed.
Variable Torque Loads:
With a variable torque load, torque
loading is a function of the speed.
This is a characteristic of centrifugal
pumps, and certain types of fans and
blowers. As the speed is increased,
typically the torque will increase with
the square of the speed and the
horsepower will increase with the
cube of the speed.
100
50
50
100
Torque
Horsepower
Percenl Tor
q
ue and Hor
se
p
owe
r
Percenl Speed
0
Per
cenl T
o
rquc and Hor
sepowe
r
Percent Speed
Torque
Horsepower
50
100
12 5
25
100
Percent Speed
Torque
0
50
100
Percent Torque and Horsepower
Percent Torque and Horsepower
50
100
100
50
