Siemens SINAMICS V90 Operating Instructions Manual page 174

Control functions
7.3 Pulse train input position control (PTI)
Electronic gear
With the function of electronic gear, you can define the motor revolutions according to the
number of setpoint pulses, and sequentially define the distance of mechanical movement.
The minimum travelling distance of load shaft according to one setpoint pulse is called a
length unit (LU); for example, one pulse results in 1 µm movement.
Benefits of electronic gear (example):
Move the workpiece for 10 mm:
Required number of setpoint pulses:
2500 ppr × 4 × (10 mm/6 mm) = 16666
The electronic gear ratio is a multiplier factor to pulse train setpoint. It is realized with a
numerator and a denominator. Four numerators (p29012[0], p29012[1], p29012[2].
p29012[3]) and one denominator (p29013) are used for the four electronic gear ratios:
Parameter
p29012[0]
p29012[1]
174
Without electronic gear
Range Factory setting
1 to 10000 1
1 to 10000 1
With electronic gear
Required number of setpoint pulses:
(10 mm × 1000) / 1 LU = 10000
Unit Description
- The first numerator of electronic gear
- The second numerator of electronic gear
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2015, A5E36037884