Rockwell Automation 1901 SyncPro User Manual
Page 30
4-4
Setup and Commissioning
1901-UM020C-EN-P – June 2013
Setup (cont.)
R
F
1 & R
F
2 Resistor Setup (cont.)
Procedure for Selection of Resistors
Discharge resistance
–
___________
ohms
Sample resistance
–
___________
ohms
0 % speed peak to peak voltage
–
___________
V (Vpeak@0)
95% speed peak to peak voltage
–
___________
V (Vpeak@95)
Induced voltage (0 % speed)
–
___________
V (Vrms@0)
Vp0/2.828
Induced voltage (95% speed)
–
___________
V (Vrms@95) Vp95/2.828
Induced current (0 % speed)
–
___________
A (Arms@0)
Vrms0/Rs
Induced current (95% speed)
–
___________
A (Arms@95) Vrms95/Rs
Induced voltage (0 % speed)
–
___________
V
I0 x Rd
Induced voltage (95% speed)
–
___________
V
I95 x Rd
0 speed induced voltage across the entire discharge resistor
= 50 ohms* 20 amps = 1000 volts
95% speed induced voltage across the entire discharge resistor
= 50 ohms* 12 amps = 600 volts
R
F
1/R
F
2 Resistance Required
___________
Ohms