Nova Electronics MCX514, Руководство пользователя

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2.5.8 Examples of Automatic Home Search
■
Example 1 Home search using a home signal
High-speed and low-speed home search is performed by one home
signal, and encoder Z-phase search is not performed. Make sure to
input a home signal to nSTOP1.
Fig. 2.5-13 Connection of Example 1 Automatic Home Search
The operation steps of an automatic home search are shown in the table below.
Table 2.5-12 Automatic Home Search Example 1 Operation
Step Operation
Execution/
Non- execution
Detection
signal
Signal level Search direction Search speed
１
High-speed search Execution
nSTOP1
Low active
－
direction 20,000pps
２
Low -speed search Execution
－
direction 500pps
３
Z-phase search Non- execution
－ － － －
４
Offset drive Execution
－
－ ＋
direction
20,000pps
In Step 1, a home search is performed at a high-speed of
20,000pps in the
－
direction until nSTOP1 signal detects Low
level, and if it detects Low level (active), operation stops by
deceleration.
In Step 2, if nSTOP1 signal is Low level (active), it drives at
a low-speed of 500pps in the direction opposite to a specified
direction (in this case
＋
direction ) by irregular operation
①
,
and then if nSTOP1 signal becomes Hi level (that is it escapes
nSTOP1 active section), operation stops. After that it drives
at a low-speed of 500pps in the direction specified by Step 2
and if nSTOP1 signal becomes Low level again, operation stops.
Fig. 2.5-14 Operation of Example 1 Automatic Home Search
In Step 1, in the case when it passes through nSTOP1 active section and then stops by deceleration, as the dash line shown in the
figure above, it returns in the opposite direction once and escapes nSTOP1 active section, then search operation is performed in
the specified direction by Step 2. This operation is applied to only when a detection signal and search direction is the same in Step
1 and Step 2.
When the automatic home search starting position is in point A as shown in the figure above, the function performs irregular
operation
①
of Step 2 without executing Step 1. When the starting position is in point B, the function performs irregular
operation
②
of Step 2 after setting the limit in the search direction in Step 1. For more details of the irregular operation
②
, see
chapter 2.5.1.
In this example, suppose that a home search is performed without an encoder such as a stepping motor, and Z-phase search is not
performed in Step 3. In Step 4, offset driving is performed to the operation home position up to 3500 pulses in the
＋
direction.
nSTOP1
Home Sensor
Photo
Coupler
MCX514
nSTOP1
Search
Direction
Step1
Step2
Ａ Ｂ
Active
Section
Active
Section
Over Run Limit in the
Search Direction