Danfoss VLT 5000 Operating Instructions Manual page 25

No. Parameter
713 Encoder type
ENCODER TYPE
714 Encoder resolution
ENCODER RES.
715 Automatic brake
control
AUTO. BRAKE
CTRL
24
Positioning Controller
Default Range
value
0 0 = incremental
1 = absolute
260kHz clock
2 = absolute
105kHz clock
3 = absolute
260kHz clock
& error
correction
4 = absolute
105kHz clock
& error
correction)/
+100 enable
hardware
encoder
monitor.
4.096 ps. 1 ... 1,000,000
pulses
1 0 = disabled
1 = enabled
Description
It is possible to use two types of encoder. If
you select any absolute encoder the home
flag is instantly set high, thus no homing is
required preceding a positioning
command.
Type 3 and 4 are to be used for linear
absolute encoder. A possible leap in the
position data can be detected if it is larger
than the encoder resolution/2. The correc-
tion is made by means of an artificial
position value which is calculated from the
last velocity. If the error continues for more
than 100 read-outs (> 100 ms), there will
be no further correction which will then
lead to a tolerated position error exceeded.
Type 3 and 4 are only available if encoder
feedback is via MK 3 D (see description of
parameter 748) type.
100 ... 104 = like 0 ... 4, however, hard-
ware monitoring of the encoder will be
activated. Error 92 will be issued in case of
open or short circuit.
NB! When switching from a setting of ab-
solute encoder to a setting of incremental
encoder, the home flag is automatically
cleared. A homing procedure afterwards is
necessary before any positioning com-
mands can be executed.
The encoder resolution must be entered in
pulses per revolution (not quad-counts per
revolution).
When the automatic brake control function
is enabled, the electromechanical brake is
automatically activated every time the
application has been at standstill for a time
period specified in parameter 718. This is
especially useful in hoist applications
where the motor could overheat if it has to
deliver full torque at standstill for a pro-
longed period of time.
When the automatic brake control function
is disabled, the drive controls the applica-
tion also at standstill.
MG.50.P3.02 - VLT is a registered Danfoss trademark