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Chapter 4
4.3.11 Home search function
The home search function allows you to make the inverter locate the
motor shaft at a specified position. You can use this function, for
example, to stop a metal-cutting machine to replace the tool attached
to the main spindle. When using the home search function, be sure to
insert a reference point pulse signal between the EZP pulse and EZN
pulse signals from the encoder.
Item
Encoder pulse-per-revolution
(PPR) setting
Home search stop position setting
Home search speed setting
Home search direction setting
Home search completion range
setting
Home search completion delay
time setting
Position loop gain setting
Terminal function
Terminal function
Alarm relay terminal function
Operation command (FW or RV)
ORT terminal
Output Frequency
Z pulse
POK signal
1) When the operation command is turned on with the ORT terminal turned on, the inverter accelerates the motor to
the speed specified by the home search speed setting (P015), and then runs the motor at a constant speed. (If the
motor is already running, the inverter changes the speed to the home search speed when the ORT terminal is
turned on.)
2) After the home search speed is reached, the inverter switches to position control mode when it detects the first Z
pulse.
3) The inverter performs position control by rotating the motor by one turn as the target amount from the position
specified by the home search stop position setting (P014) when running the motor forward, or by two turns as the
target amount from the home search stop position (P014) when running the motor reversely. In this case, the
shorter the deceleration time, the larger the position loop gain setting (P023) becomes. (This deceleration time
does not follow the deceleration time setting.)
4) The inverter outputs a POK signal when the time specified by the home search completion delay time setting (P018)
elapses after the remaining number of pulses enters the range specified by the home search completion range
setting (P017). (The inverter continues to output the POK signal until the ORT terminal is turned off.) After home
search operation has been completed, servo lock status continues until the operation command is turned off.
Function code
Data or range of data
128. to 9999. or 1000 to 6553
P011
(10000 to 65535) (pulses)
P014
0.00 to 99.99 or 100.0 to 120.0
P015
P016
0. to 9999. or 1000 (10000)
P017
P018
P023
0.00 to 99.99 or 100.0 (rad/s)
C001 to C008
C021 to C025
C026
ON
ON
(2)
(1)
Speed control
4-104
Explanation of Functions
Related code
P011: Encoder pulse-per-revolution (PPR) setting
P014: Home search stop position setting
P015: Home search speed setting
P016: Home search direction setting
P017: Home search completion range setting
P018: Home search completion delay time setting
P023: Position loop gain setting
C001 to C008: Terminal [1] to [8] functions
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
0. to 4095.
See Note 1.
(Hz)
00
01
(pulses)
0.00 to 9.99 (s)
45
ORT: Orientation
23
POK: Positioning end signal
Home search speed setting (P015)
(3)
Home search completion
range setting (P017)
ON
(4)
Home search completion delay
Position control
time setting (P018)
Description
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