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
• Make sure to have the following safety circuits outside of the PLC to ensure safe system operation even during external power supply
problems or PLC failure. Otherwise, malfunctions may cause serious accidents.
1) Most importantly, have the following: an emergency stop circuit, a protection circuit, an interlock circuit for opposite movements
(such as normal vs. reverse rotation), and an interlock circuit (to prevent damage to the equipment at the upper and lower
positioning limits).
2) Note that when the PLC CPU detects an error, such as a watchdog timer error, during self-diagnosis, all outputs are turned off.
Also, when an error that cannot be detected by the PLC CPU occurs in an input/output control block, output control may be
disabled. External circuits and mechanisms should be designed to ensure safe machinery operation in such a case.
3) Note that when an error occurs in a relay, triac or transistor output device, the output could be held either on or off. For output
signals that may lead to serious accidents, external circuits and mechanisms should be designed to ensure safe machinery
operation in such a case.
• At Forward/Reverse rotation limits, make sure to wire the contacts with NC, negative-logic. Wiring contacts with NO, positive-logic
may cause serious accidents.
DESIGN PRECAUTIONS
• Make sure to observe the following precautions in order to prevent any damage to the machinery or accidents due to abnormal data
written to the PLC under the influence of noise:
1) Do not bundle the main circuit line together with or lay it close to the main circuit, high-voltage line or load line. Otherwise, noise
disturbance and/or surge induction are likely to take place. As a guideline, lay the control line at least 100mm (3.94") or more away
from the main circuit or high-voltage lines.
2) Ground the shield wire or shield of the shielded cable at one point on the PLC. However, do not ground them at the same point as
the high-voltage lines.
• Install module so that excessive force will not be applied to the built-in programming connectors, power connectors or I/O connectors.
Failure to do so may result in wire damage/breakage or PLC failure.
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 the 20SSC-H and servo amplifier.
Set the servo series of servo parameters according to the 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 in modes 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.
40
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 7.8.9 and 11.1.2
7.1 Note on Setting Parameters