Emerson FM-3 Manuel D’Utilisation

222

FM-3 Programming Module Reference Manual

IR = Inertia Ratio

R = ramp in ms/kRPM
Ta = (unsigned) percent continuous torque required during acceleration ramping (0 
- 300)
Td = (unsigned) percent continuous torque required during deceleration ramping 
(0 - 300)
Vm = motor constant value from Table 18 below

Where:

IR = Inertia Ratio

R = ramp in ms/kRPM
Vm = motor constant value from the table below
Tau = (unsigned) percent continuous torque required during acceleration ramping 
while moving up (against the constant force)
Tdu = (unsigned) percent continuous torque required during deceleration ramping 
while moving up (against the constant force)
Tad = (unsigned) percent continuous torque required during acceleration ramping 
while moving down (aided by the constant force)
Tdd = (unsigned) percent continuous torque required during deceleration ramping 
while moving down (aided by the constant force)

If you are using an external position controller to generate motion you may need to connect 
the ramp units as desired below.

Many position controllers define acceleration in units per sec

2

. The formulas above use ms/

kRPM. Make sure you make this conversion when entering the information into the formula.

Where:

MPK = accel ramp in ms/kRPM 

RPSS = accel ramp in revolutions per second

2

1

4000

Tdd))

 

 

Tad

 

 

Tud

 

(Tau 

 

Vm

 

 

(R

  

 

IR

−

+

+

+

•

=

60)

 

 

(RPSS

10

 

MPK 

6

•

=