Rockwell Automation 1901 SyncPro - 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