Before Starting Positioning Operation; Note On Setting Parameters - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
7.

Before Starting Positioning Operation

DESIGN PRECAUTIONS
• Provide a safety circuit on the outside of the PLC so that the whole system operates to ensure the safety even when external power
supply trouble or PLC failure occurs.
Otherwise, malfunctions or output failures may result in an accident.
1) An emergency stop circuit, a protection circuit, an interlock circuit for opposite movements, such as normal and reverse rotations,
and an interlock circuit for preventing damage to the machine at the upper and lower positioning limits should be configured on the
outside of the PLC.
2) When the PLC CPU detects an error, such as a watch dog timer error, during self-diagnosis, all outputs are turned off. When an
error that cannot be detected by the PLC CPU occurs in an input/output control block, output control may be disabled.
Design external circuits and mechanisms to ensure safe operations of the machine in such a case.
3) When some sort of error occurs in a relay, triac or transistor of the output unit, output may be kept on or off.
For output signals that may lead to serious accidents, design external circuits and mechanisms to ensure safe operations of the
machine in such cases.
• At forward/reverse rotation limits wiring, make sure to wire in negative logic and use NC contact. Setting in positive logic and using
NC-contact can cause serious accidents.
DESIGN PRECAUTIONS
• Observe the following items. Failure to do so may cause incorrect data-writing by noise to PLCs and result the PLC failure, machine
damage or an accident.
1) Do not lay close or bundle with the main circuit line, high-voltage line, or load line.
Noise and Surge induction interfere with the system operation.
Keep a safe distance of least 100 mm (3.94") from the above lines during wiring.
2) Ground the shield wire or shield of a shielded cable at one point on the PLC. However, do not ground at the same point as high
voltage lines.
• Install in a manner which prevents excessive force from being applied to the built-in connectors dedicated to programming, power
connectors and I/O connectors.
Failure to do so may result in wire breakage or failure of the PLC.
7.1

Note on Setting Parameters

Set the positioning parameters and servo parameters according to the system.
The following parameters must be set.
1) Servo series [Servo parameters (Basic setting)]
This parameter must be set to transfer information between 20SSC-H and the servo amplifier.
Set the servo series of servo parameters according to servo amplifier.
Servo parameters must be saved to the flash memory in 20SSC-H.
2) Function selection C-4 [Servo parameters (Expansion setting)]
Immediately after power ON, this parameter needs to be set to operate other than the JOG or manual
pulse generator operation modes.
Set "1: Not needed to pass motor Z-phase after the power supply is switched on" (default setting) here.
In other setting cases, the servo motor should be rotated more than one revolution by the JOG or manual
pulse generator immediately after power-ON.
3) Zero return interlock setting [Positioning parameters (Operation parameter 2)]
Immediately after power ON, this parameter needs to be set to operate in modes other than the JOG,
manual pulse generator or mechanical return operation modes.
Set "invalid" here.
In other setting cases, operate to be set to the zero return executed flag.
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7 Before Starting Positioning Operation
→ For servo series details, refer to subsection 11.2.1
→ For details, refer to subsection 8.1.1 and 11.2.3
→ For details, refer to subsection 7.6.9 and 11.1.2
7.1 Note on Setting Parameters