Lenze IMSS500+ Simple Servo 500 600 i1000 - Manual (Page 41)

SimpleServo 500/600/i1000 User Manual Rev 3.4
• Motor Voltage Constant (Ke).
This must be set in Volts per thousand RPM (V/kRPM). The motor voltage constant will typically
be between Ke = 1V/kRPM and Ke = 70 V/kRPM. This entry should be made to 3 significant
places. Include the decimal places if the number is given as a whole number (for example, if Ke is
given as 34 V/kRPM, then enter 34.0). The program expects to enter Ke voltage constant for
Phase-Phase voltage RMS value. If you have Ke for peak sine wave then multiply by 0.707 to get
correct Ke RMS value.
• Phase to phase winding Resistance (R) in Ohms ( Ω).
This is also listed as the terminal resistance (Rt). The phase-to-phase winding Resistance will
typically be between R = 0.5 Ohms and R = 200 Ohms.
• Phase to phase winding Inductance (L).
This must be set in milliHenries (mH). The phase-to-phase winding Inductance will typically be
between L = 0.5 mH and L = 150.0 mH.
Note
If the units for the phase-to-phase winding Inductance (L) are given in microHenries (
µH),
then multiply by 1000 to get mH.
• Nominal phase current (RMS Amps) Maximum continuous phase current rating (Imax) in Amps
RMS. Do not use the peak current rating.
Note
Sometimes the phase current rating will not be given. The equation below may be used to
obtain the maximum continuous phase-to-phase winding current from other variables.
Imax= Continuous Stall Torque / Motor Torque Constant (Kt)
The same force x distance units must be used in the numerator and denominator in the equation
above. If T (torque) is expressed in units of pound-inches (lb-in) then, Kt must be expressed in pund-
inches per Amp (lb-in/A). Likewise, if T is expressed in units of Newton-meters (N-m), then units for Kt
must be expressed in Newton-meters per Amp (N-m/A).
Example: Suppose that the maximum continuous phase to phase winding current (Imax) is
not given. Instead, we look up and obtain the following:
Continuous stall torque T = 3.0 lb-in
Motor torque constant Kt = 0.69 lb-in/A
Dividing, we obtain:
Imax = 3.0 lb-in / 0.69 lb-in/A =4.35 (A)
Our entry for Imax would be 4.35. Note that the pound-inch (lb-in) units cancelled in the
equation above leaving only Amps (A). We would have to use another conversion factor if the
numerator and denominator had different force x distance units.
• Nominal Bus Voltage (V
BUS
).
If the motor nominal terminal voltage is 200 - 240VAC phase to phase, enter 325(V).
If the motor nominal voltage is below 200VAC enter 165 (V).
This value is initial (seed) voltage for drive and correct voltage will be calculated dynamically
depending on the drive’s incoming voltage value.
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