Lenze S94P01B2 - Manual (Page 39)

S94P01B2
37
Parameters
5.3.1.3 Position Mode
In this mode the drive reference is a pulse-train applied to P3.1-4 terminals, if the
parameter “Reference” is set to “External”. Otherwise the reference is taken from the
drive’s internal variables. (Refer to Programmer’s manual for details).
P3.1-4 inputs can be configured for two types of signals: step and direction and Master
encoder quadrature signal. Refer to section 4.2.1 for details on these inputs connections.
Refer to section 8.3 for details about positioning and gearing.
When the Reference is set to Internal, the drives reference position, (theoretical or
Target position), is generated by trajectory generator. Access to the trajectory generator
is provided by motion statements, MOVEx and MDV, in the User Program.
5.3.2 Drive PWM Frequency
This parameter sets the PWM carrier frequency. Frequency can be changed only when
the drive is disabled. Maximum overload current is 300% of the drive rated current when
the carrier is set to 8kHz, it is limited to 250% at 16kHz.
5.3.3 Current Limit
The CURRENT LIMIT setting determines the nominal current, in amps RMS per phase.
5.3.4 Peak Current Limit (8kHz and 16 kHz)
Peak current sets the motor RMS phase current that is allowed for up to 2 seconds.
After this two second limit, the current limit will be reduced to the value set in the Current
Limit parameter. When the motor current drops below nominal current for two seconds,
the drive will automatically re-enable the peak current level. This technique allows for
high peak torque on demanding fast moves and fast start/stop operations with high
regulation bandwidth. The control will use only the Peak current limit parameter for the
carrier frequency selected.
5.3.5 Analog Input Scale (Current)
This parameter sets the analog input sensitivity for current reference used when the
drive operates in Torque mode. Units for this parameter are A/Volt. To calculate this
value use the following formula:
Iscale = Imax / Vin max
Imax maximum desired output current (motor phase current RMS)
Vin max max voltage fed to analog input at Imax
Example: Imax = 5A (phase RMS)
Vin max = 10V
Iscale = Imax / Vin max = 5A / 10V = 0.5 A / Volt (value to enter)
5.3.6 Analog Input Scale (Velocity)
This parameter sets the analog input sensitivity for the velocity reference used when the
drive operates in Velocity mode. Units for this parameter are RPM/Volt. To calculate this
value use the following formula:
Vscale = VELOCITYmax / Vin max
VELOCITYmax maximum desired velocity in RPM
Vin max max voltage fed to analog input at Velocity
max
Example: VELOCITYmax = 2000 RPM
Vin max = 10V
Vscale = VELOCITYmax / Vin max
= 2000 / 10V
= 200 RPM / Volt ( value to enter)