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Operational Modes and Motion Modes
What is the condition for changing between the different unit modes?
The motor must be off.
What are the possible sources of current commands in current mode?
TC (internal)
Analog (external)
PWM (external)
What are the possible sources of the velocity command in velocity mode?
Profiler, external analog command, follower on external encoder
Explain the usage and meaning of the SF (smooth factor)?
Smooth factor is the sinusoidal adjustment of the acceleration.
How would you set VH[2] in relation to HL[2]?
HL[2] is the limitation of VH[2] so VH[2] = HL[2]/2
Elmo drives can output 50% and 100% PWM velocity duty cycle command format through the auxiliary encoder? True or false
False
100% only since it enables the highest possible resolution.
What is the PM parameter? What is the difference between PM=0 and PM=1?
PM=1 Use the profiler (acc + dec + SF)
PM=0 Bypass the profiler – gives step response to the system.
What movement is faster – SF=50 or with SF=100?
SF=50.
What are the additional functional features of the Advanced version of an Elmo drive?
ECAM, 32 KB of memory.
Why do we need the Follower feature?
Synchronize motion with an external axis.
What is dual position mode? Why do we need it?
Using two encoders as an input to close the position and commutate the motor. For example, it is used when closing the position on the linear encoder of a ballscrew stage and commutation for the motor on the end.
What is the position reference generator? What are the 5 modes of software referencing?
The position reference generator is a software command, external position reference and stop manager.
Point-to-point, jog, PT, PVT, idle
PTP May be initiated at any time. True or False?
True
What is Jog? At what mode of operation do we run it?
Moving at a constant velocity. Position unit mode.
Give an example of a machine that can use ECAM.
A textile curtain machine rotating a drum while outputting positions to 50 separate motors in order to sew a certain pattern.
What is pulse and direction? Explain
This involves a separate input through the Elmo auxiliary encoder input. Each pulse advances the position by one count and gives the direction. The width of the pulse determines its speed.
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