Installation manual

50
Epsilon EP-B Base Drive Reference Manual
Rotor Inertia
This parameter specifies the inertia of the motor rotor. The drive uses this parameter to interpret the “Inertia Ratio”
parameter. “Inertia Ratio” is specified as a ratio of reflected load inertia to motor inertia.
Motor KE
Specifies the Ke of the motor. The units are Vrms/ kRPM. The line-to-line voltage will have this RMS value when the
motor is rotated at 1000 RPM. The range is 5.0 to 500.0 Vrms/ kRPM. The motor manufacturer will typically provide the
Ke data.
Phase Resistance
Specifies the phase-to-phase resistance of the motor. This value is determined by measuring the resistance between
any two motor stator terminals with an ohm meter. The range is.1 to 50 ohms.
Phase Inductance
Specifies the phase-to-phase inductance of the motor.
Max Operating Speed
This parameter specifies the maximum speed of the motor when used with a variable speed drive to achieve velocities
over the rated base speed of the motor.
Encoder Lines/Rev
Specifies a coefficient for determining the number of encoder lines per mechanical revolution. The supported values are
1 to 16383. The equation for determining the total number of encoder lines per revolutions is:
nLines = n*10x
where:
nLines = Total number of Encoder Lines
n = Motor Encoder Lines per Rev Coefficient
x = Motor Encoder Exponent
The total number of encoder lines is used both for commutation and for position/velocity control. To properly commutate
the motor, the drive must know the electrical angle (the angle between the motor magnetic field and stator coils).
Encoder Lines/Rev Exponent
Specifies a coefficient for determining the number of encoder lines per mechanical revolution. The supported values are
1 to 16383. The equation for determining the total number of encoder lines per revolutions is:
nLines = n*10x
where:
nLines = Total number of Encoder Lines
n = Motor Encoder Lines per Rev Coefficient
x = Motor Encoder Exponent
The total number of encoder lines is used both for commutation and for position/velocity control. To properly commutate
the motor, the drive must know the electrical angle (the angle between the motor magnetic field and stator coils).
Encoder Marker Angle
Specifies the electrical angle at which the marker (Z) pulse occurs with reference to V
TS
when the motor is spun in the
encoder reference direction. At power-up the drive obtains an initial estimate of the electrical angle from the status of
the U, V and W commutation tracks. This estimate can be off by as much as 30 °.
When the drive receives the marker pulse, the drive will, within one second, gradually shift the commutation to the more
accurate electrical angle specified by this parameter. The system will then operate more efficiently.
Encoder U-track Angle
Specifies the electrical angle at which the rising edge of the U commutation track will occur with reference to VTS when
the motor is spun in the encoder reference direction.
At power-up the drive looks at the status of the U, V and W commutation tracks and, using this parameter, obtains a
crude (± 30 °) estimate of the electrical angle.
Encoder Reference Motion
Specifies the direction of motion assumed in phase plots of the encoder’s quadrature and summation signals. The
supported values are CW(1) and CCW(0). Your encoder may have the same phase plot but is generated from a different
direction of rotation. This parameter affects the way the drive interprets the quadrature and commutation signals.