Lenze E94P PositionServo with MVOB - Manual (Page 77)

S94H201E_13426446_EN L 75
Operation
6.5 Position Mode Operation (gearing)
In position mode the drive will follow the master reference signals at the 1-4 inputs of P3. The distance the
motor shaft rotates per each master pulse is established by the ratio of the master signal pulses to motor
encoder pulses (in single loop configuration). The ratio is set by “System to Master ratio” parameter (see
section 5.3.16).
Example 1
Problem: Setup the drive to follow a master encoder output where 1 revolution of the master
encoder results in 1 revolution of the motor
Given: Master encoder: 4000 pulses / revolution (post quadrature)
Motor encoder: 8000 pulses / revolution (post quadrature)
Solution: Ratio of System (motor encoder) to Master Encoder is 8000/4000 = 2/1
Set parameter “System to master ratio” to 2:1
Example 2
Problem: Setup drive so motor can follow a master encoder wheel where 1 revolution of the
master encoder results in 3 revolutions of the motor
Given: Motor encoder: 4000 pulses / revolution (post quadrature)
Master encoder: 1000 pulses / revolution (post quadrature).
Desired “gear ratio” is 3:1
Solution: Ratio = (motor encoder PPR / master encoder PPR) x the “gear ratio”:
(Motor PPR / Master PPR)*(3/1) => (4000/1000)*(3/1) => 12/1
Set parameter “System to master ratio” to 12:1
6.6 Enabling the PositionServo
Regardless of the selected operating mode, the PositionServo must be enabled before it can operate. A
voltage in the range of 5-24 VDC connected between P3 pins 26 and 29 (input IN_A3) is used to enable
the drive (section 4.1.7, note 3). There is a difference in the behavior of input IN_A3 depending on how
the “Enable switch function” is set.
TIP! If using the onboard +5VDC power supply for this purpose, wire
your switch between pins P3.6 and P3.29. Jumper P3.5 to P3.26. If doing this, all inputs in group must be
powered by P3.6.
When the “Enable switch function” is set to “RUN”:
IN_A3 acts as positive logic ENABLE or negative logic INHIBIT input depending on:
If user program is not running: Activating IN_A3 enables the drive
If user program is running: Activating IN_A3 acts as negative logic
“Inhibit” and operates exactly as if parameter
“Enable switch function” set to “Inhibit”
When the “Enable switch function’ set to “Inhibit”:
IN_A3 acts as negative logic INHIBIT input regardless of mode or program status.
Activating input IN_A3 doesn’t enables the drive. The drive can be enabled from the user’s program or
interface only when IN_A3 is active. Attempt to enable drive by executing the program statement “ENABLE”
or from interface will cause the drive to generate a fault, F_36. Regardless of the mode of operation, if the
input is deactivated while the drive is enabled, the drive will be disabled and will generate a fault, F_36.
WARNING!
Enabling the drive allows the motor to operate depending on the reference command.
Before enabling the drive, make sure that the motor and machine are safe to operate and
that moving elements are appropriately guarded.
Failure to comply could result in damage to equipment and/or injury to personnel!