Hitachi SJ700-4000HFU2

Chapter 4 Explanation of Functions
4-104
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
Function code
Data or range of data
Description
Encoder pulse-per-revolution
(PPR) setting
P011
128. to 9999. or 1000 to 6553
(10000 to 65535) (pulses)
Home search stop position setting
P014
0. to 4095.
Home search speed setting
P015
0.00 to 99.99 or 100.0 to 120.0
(Hz)
See Note 1.
Home search direction setting
P016
00
01
Home search completion range
setting
P017
0. to 9999. or 1000 (10000)
(pulses)
Home search completion delay
time setting
P018
0.00 to 9.99 (s)
Position loop gain setting
P023
0.00 to 99.99 or 100.0 (rad/s)
Terminal function
C001 to C008
45
Terminal function
C021 to C025
23
ORT: Orientation
Alarm relay terminal function
C026
POK: Positioning end 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.
Operation command (FW or RV)
ORT terminal
Z pulse
Output Frequency
Home search speed setting (P015)
ON
ON
ON
POK signal
Home search completion
range setting (P017)
Home search completion delay
time setting (P018)
Speed control
Position control
(1)
(2)
(3)
(4)
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
Related code