NOVA electronics Inc.
MCX514 -
46
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46
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2.5.4
Setting a Search Speed and a Mode
To perform an automatic home search, the following speed parameters and mode must be set.
■
Setting speed parameters
Table 2.5-2 Setting Speed Parameters
Speed parameter
Command code (hex)
Description
Drive speed (DV)
05
High-speed search and drive speed that is applied in Steps 1 and 4.
However in irregular operation of Step 2, when the user searches in
the direction opposite to a specified search direction, this drive
speed is applied. Acceleration (AC) and initial speed (SV) must also
be set to appropriate values to perform acceleration/deceleration
driving. See chapter 2.2.2.
Home search speed (HV)
14
Low-speed search speed that is applied in Steps 2 and 3.
Set a value lower than the initial speed (SV) to stop instantly when a
search signal becomes active. See chapter 2.2.1.
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Automatic home search mode setting 1
Automatic home search mode setting 1 can be set by setting each bit of WR6 register as shown below and then writing automatic
home search mode setting 1 command (23h) into WR0 register. It specifies execution/non-execution of each step, detection signal,
search direction, deviation counter clear output and logical/real position counter clear.
D7
D6
D5
D4
H
L
D15
D14
D13
D12
D11
D10
D9
D8
D3
D2
D1
D0
S1EN
S1DR
S1G0
S1G1
S2EN
S2DR
S2SG
S2RC S2DC
S2LC
S3EN
S3DR
S3RC S3DC
S3LC
S4EN
WR6
①
Execution/non-execution of each step
Specify whether operation of each step is executed.
0: Non-execution, 1: Execution
The specified bit for execution / non-execution in each step is shown in the table below.
Table 2.5-3 Execution / Non-execution Specified Bit in Each Step
Step 1
Step 2
Step 3
Step 4
Execution / Non-execution
Specified Bit
D0 bit
S1EN
D4 bit
S2EN
D10 bit
S3EN
D15 bit
S4EN
0: Non-execution
1: Execution
②
Search direction of each step
Specify the search direction of a detection signal in each step.
0:
+
direction, 1:
-
direction
The specified bit for a search direction in each step is shown in the table below.
Table 2.5-4 Search Direction Specified Bit in Each Step
Step 1
Step 2
Step 3
Step 4
Search Direction
Specified Bit
D1 bit
S1DR
D5 bit
S2DR
D11 bit
S3DR
―
0:
+
direction
1:
-
direction