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MOP
MOP
The Motor Operated Pot (MOP) function uses either digital inputs or network
commands to increment or decrement the speed reference at a programmed rate.
The MOP has three components:
•
[MOP Rate] parameter
•
[Save MOP Ref] parameter
•
[MOP Frequency] parameter
MOP increment input
MOP decrement input
The MOP rate is the rate at which the MOP reference will change when
commanded to increment or decrement. This rate is independent of acceleration
and deceleration times.
MOP rate is defined in Hz/sec. The MOP reference will increase/decrease linearly
at that rate as long as the MOP inc or dec is asserted. Asserting both MOP inc and
dec inputs simultaneously will result in no change to the MOP reference.
[Save MOP Ref] is a parameter that provides configurability of the initial MOP
reference value after a power down or Stop command.
Bit 0
0 = Don’t save MOP reference on power-down (default)
1 = Save MOP reference on power-down
If the value is “SAVE MOP Ref” when the drive power returns, the MOP
reference is reloaded with the value from the non-volatile memory. When the bit
is set to 0, the MOP reference defaults to zero when power is restored.
Bit 1
0 = Reset MOP reference when STOP is asserted
1 = Don’t reset MOP reference when STOP is finished (default)
Important:
The MOP reset only occurs when a stop event completes and is not
continuously cleared while the drive is stopped. The reset only applies
to the stop edge and not when a fault is detected.
Incrementing or decrementing the MOP frequency is independent of whether or not
MOP is being used as the speed reference. See "Speed Reference" on
page 98
for
an explanation of activating a specific speed reference.
The [MOP Frequency] parameter shows the value of the MOP reference.
MOP handling with Direction Mode
If the Direction Mode is configured for “Unipolar,” then the MOP decrement will
clamp at zero not allowing the user to generate a negative MOP reference that is
clamped off by the reference generation. When Direction Mode = “Bipolar” the
MOP reference will permit the decrement function to produce negative values. If
the drive is configured for Direction Mode = “Bipolar” and then is changed to
“Unipolar”, the MOP reference will also be clamped at zero if it was less than zero.
70EC
700VC
700H
✔ ✔
MOP Dec
MOP Inc
MOP Reference