212 Rockwell Automation Publication 7000-UM202D-EN-P - May 2018
Appendix H Encoder Use and Torque Capabilities
MIXERS
Chemical CT 175 75 100 Contact
factory
Yes
Liquid CT 100 100 100 Heavy Yes
Slurry CT 150 125 100 Heavy Yes
Solids CT 175 125 175 Contact
factory
Yes
PULPER VT 40 100 150 Contact
factory
No
PUMPS
Centrifugal,
discharge open
VT 40 100 100 Normal No
Oil field Flywheel CT 150 200 200 Contact
Factory
Yes
Propeller VT 40 100 100 Normal No
Fan Pump VT 40 100 100 Norma No
Reciprocating /
Positive
Displacement
CT 175 30 175 Contact
factory
Yes
Screw type,
started dry
VT 75 30 100 Normal No
Screw type,
primed, discharge
open
CT 150 100 1000 Heavy Yes
Slurry handling,
discharge open
CT 150 100 100 Heavy Yes
Turbine,
Centrifugal, deep-
well
VT 50 100 100 Normal No
Vane-type,
positive
displacement
CT 150 150 175 Contact
factory
Yes
SEPARATORS,
AIR
(fan type)
VT 40 100 100 Normal No
(1) Torque required to start a machine from standstill.
(2) Torque required to accelerate a load to a given speed, in a certain period of time. Calculate the average torque to accelerate a
known inertia (WK):
T = (WK x change in RPM) / 308t
where:
T = acceleration torque in N•m (lb•ft)
W = force N or kgf (lb)
K = gyration radius m (ft)
WK = total system inertia (kgf x m [lb•ft]) that the motor must accelerate, including motor, gear box, and load
t = time (s) to accelerate total system load
Table 23 - Typical Application Load Torque Profiles (Continued)
Application Load
Torque
Profile
Load Torque as Percent of Full-Load Drive
Torque
Required
Drive Service
Duty Rating
Encoder
Required for
Extra
Starting
Torque?
Break-
away
(1)
Accelerating
(2)
Peak
Running
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