Danfoss VLT 5000 Operating Instructions Manual page 27

No. Parameter
722 Motor/encoder gear
denominator
MOT/ENC GEAR
DEN
723 Maximum jog
velocity
MAX.JOG
VELOCITY
724 Jog ramp time
JOG RAMP TIME
725 Error behaviour
ERROR
BEHAVIOUR
726 Maximum tolerated
PID error
MAX. TRACK
ERROR
26
Positioning Controller
Default Range
value
1 0 ... 1,000
100 ERPM 1 ...
999,999 ERPM
5,000 ms 50 ... 100,000 ms
0 0 = electronic
brake
1 = mechanical
brake
20,000 qc 0 ...
1,000,000,000 qc
Description
See the description of P721.
If the encoder is mounted directly on the
motor shaft this parameter setting should
remain at "1".
The maximum speed allowed while jogging
the application is specified in terms of
Encoder Revolutions Per Minute (ERPM).
NB! This setting must never exceed a
value that is approx. 5% lower than the
value calculated in P799.
This parameter specifies both the ramp-up
time as well as the ramp-down time used
during jogging.
The ramp time is defined as the time in
milliseconds it would take to ramp from
standstill to the maximum allowed velocity
(P799).
This parameter determines the behaviour
of the drive after an error is detected.
If "0" is selected the drive will ramp down to
standstill with the shortest possible ramp
(P719). After achieving standstill it will
activate the electronic brake according to
the setting of P716. If the drive is coasted at
any point during ramp down (e.g. due to an
OVER CURRENT trip – ALARM 13) the
drive will immediately activate the brake and
coast the drive.
If "1" is selected the drive will immediately
activate the brake and coast the drive.
NB! The brake is always activated after an
error situation (or quick stop) regardless of
the P715 setting.
The PID track error is defined as the diffe-
rence between the internal controller set-
point and the actual position. The better
tuning of the PID controller (P702-709) the
lesser the PID track error.
At every sample time the current track
error is compared with the setting of P726.
It is defined as an error situation ("PID
track error too big" - P798 = 9) if the track
error is bigger than the setting of P726.
MG.50.P3.02 - VLT is a registered Danfoss trademark