Drive control and features
70
Preset functions
Preset functions are used to set the position system according to a parameter value
(preset position) or actual position. The physical position of the driven machinery is
not changed, but the new position value is used as home position. Preset functions
can be used, eg, in synchron control to change the follower position without moving
the master.
The preset function trigger signal is selected by parameter 62.12 PRESET TRIG.
There are three different preset functions:
• SYNCH REF: Preset drive synchron reference chain (4.16 SYNC REF GEARED)
to the value of 62.13 PRESET POSITION.
• ACT TO SYNCH: Preset drive synchron reference chain (4.16 SYNC REF
GEARED) to the value of actual position (1.12 POS ACT).
• WHOLE SYSTEM: Preset whole position system of the drive to the value of 62.13
PRESET POSITION. The whole position system consists of the position
reference chain and synchron reference chain (4.13 POS REF IPO, 4.16 SYNC
REF GEARED, 4.17 POS REF LIMITED, 1.12 POS ACT).
In addition, homing method 35 (selectable by parameter 62.01 HOMING METHOD)
can be used to set the position reference chain (4.13 POS REF IPO, 4.17 POS REF
LIMITED, 1.12 POS ACT) to the value of 62.09 HOME POSITION on a rising edge
of 62.03 HOMING START.
27 Home switch No Negative* Negative
28 Home switch No Negative* Negative
29 Home switch No Negative Negative
30 Home switch No Negative Negative
31…32 Reserved
33 Index pulse No Negative None
34 Index pulse No Positive None
35 None
Any
No None None
*Opposite direction if home switch is active at start of homing sequence.
**Example:
Method Homing latch signal Homing done condition**
Homing
speed 2
Starting
direction
Limit switches
required
Home latch signal
Positive direction
Index pulse
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