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Step 3 Direction search direction
－
Step 4 Enable enable/disable
Enable
Enable
Step 4 Direction search direction
＋
＋
direction
Position Clear
Enable
Position counter clear after finishing home search.
Using Limit Signal
Disable
Disable
DCC Enable
deviation counter clear enable
Disable
Disable (not used)
DCC Level
deviation counter clear level
0
DCC Width (
μ
sec)
deviation counter clear width
10
■
Example of executing home search by only limit signal
For a simple home search, the limit signal of one side is used as an alternative to home signal. However, the following two
conditions are applied.
●
When high-speed search operation is performed, decelerating stop must sufficiently be performed within the distance
from limit signal activation position to mechanical limit position.
●
Home search position cannot be beyond the limit signal active section in the search direction.
In this example, the limit signal in the –direction is used as home signal.
●
Connect LMT-input to STOP0 and STOP1 input pins as shown
in the diagram.
●
To perform high-speed search of Step 1, set a limit stop mode
to decelerating stop.
●
Set the same logical level for the LMT-, STOP0, and STOP1
signals.
●
Enable Using Limit Signal (using over run limit) of home
search mode.
●
Execute Step 4 (offset driving) to escape from the limit.
[Operation]
Input signal and logical level Search
Direction
Search
Speed
Step 1
STOP0,
Low (GEX Short-circuited)
－
10,000pps
Step 2
STOP1,
Low (GEX Short-circuited)
－
200pps
Step 3
Non-execution
Step 4
500 pulse offset driving in
the
＋
direction.
＋
10,000pps
The axis drives up to the limit at high-speed in the –direction in Step 1. When the – limit signal becomes active, the function stops
operation by decelerating and advances to Step 2. The function exits control from the limit in the opposite direction by irregular
operation (2) of Step 2 and stops operation when Limit Signal Active is detected at low-speed in the search direction. When the
home search starting position is within the limit (point A in the diagram above), the function starts from Step 2 without execution
of Step 1. The function finishes at the out of the limit active section by offset driving in the opposite direction in Step 4.
[Note]
1. The same search direction must be applied for Step 1 and Step 2.
2. Step 4 must be enabled and applied to the direction opposite to Step 1 and 2. Make sure that home search operation finishes at
the out of the limit active section.
3. When enabling Step 3, apply the direction opposite to Step 1 and 2.
4. Limit stop mode should be set to decelerating stop.
XSTOP0
XSTOP1
X -Direction
XLMT-
MR210A/220A
CN4
13
10
11
Over Run Limit
Active
STOP0=STOP1=LMT-
Search Direction
Over Run Limit in the Search Direction
Step 1
Step 2
Ａ
M
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chan
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O
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R
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L
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Section
Step 4
