Periodic Inspection Items - Nachi RMU20-20 Instruction Manual

7.1.3

Periodic inspection items

1) Inspection of safety inputs
When the RMU continues to be used with two safety input signals in the closed state, the input circuit for
the two signals cannot be diagnosed. Therefore, the two contacts of the safety inputs must be opened at
periodic intervals to perform the inspections.
Inspection location
Robot emergency
stop
Safety plug
Emergency stop
Robot LS
2) Displays
Inspection location
RUN LED
(7 segments)
3) Installation and connection statuses
Inspection location
Installation of unit
Screws
Connector
Period
No
.
1
○ ○ ○
2
3
○ ○ ○ ○
4
5
Details of inspection
Set the robot emergency stop
signal, Safety plug signal and
emergency stop signal all to ON,
And make sure that each function
to work properly.
Set the robot LS signal to OFF,
and check that LS signal is OFF
on the screen of the teach
pendant.
Details of inspection
Check that the LED is lighted as if
to describe the number "8."
Details of inspection
Check that the RMU is installed
properly inside robot controller.
Check that the bracket and the
ground terminal are not loose.
Check for loose connectors.
Inspection
item
Cables
Circuit board
○ ○
connectors
Entire unit
Safety inputs
○ ○
Voltage
measurement
○ ○
If each function does not work, check the
connections of the cables to the RMU. If the
cables are connected properly, replace the
RMU.
If the signal does not go off, check the
connections of the cables to the RMU. If the
cables are connected properly, replace the
RMU.
If an error is displayed, proceed with
troubleshooting.
Install it properly inside robot controller.
Tighten up any loose screws.
Insert the connectors properly.
Refer to the section in "Chapter 2 Monitoring
Unit Configuration."
Details of inspection or maintenance
 Check for damage and flattening.
 Loose connectors
 Loose connectors
 Check for dust and dirt.
 Refer to "7.1.3Periodic inspection
items 1)".
 Check that the voltage between
U24V-U0V and U24A-U0A is DC
24V +/-10%.
7.1Periodic Inspections
Remedial action
Remedial action
Remedial action
Method
Visually inspect.
Press by hand.
Visually inspect and
clean.
Visually inspect.
Measure using a
multimeter or
voltmeter.
7-3