Renishaw OMI-2H User manual

OMI-2H optical machine interface
Installation guide
H-5157-8504-01-B

Renishaw part no:
First issued:
Revised
H-5157-8504-01-B
04.2016
12.2022
© 2016–2022 Renishaw plc. All rights reserved.
This document may not be copied or reproduced in whole or in part, or transferred to any other media
or language, by any means, without the prior written permission of Renishaw plc.
Renishaw plc. Registered in England and Wales. Company no: 1106260. Registered office: New Mills,
Wotton-under-Edge, Gloucestershire, GL12 8JR, UK.
Compliance information for this product is available by scanning the QR code or visiting
www.renishaw.com/mtpdoc

i
Contents
Before you begin .............................................................1.1
Disclaimer .................................................................1.1
Trade marks................................................................1.1
Warranty ..................................................................1.1
CNC machines .............................................................1.1
Care of the interface .........................................................1.2
Patents ...................................................................1.2
Intended use ...............................................................1.2
Safety ....................................................................1.2
OMI-2H basics................................................................2.1
Introduction ................................................................2.1
Power supply ............................................................2.1
Input voltage ripple........................................................2.1
OMI-2H visual diagnostics.....................................................2.2
START SIGNAL LED (yellow)................................................2.3
LOW BATTERY LED (red) ..................................................2.3
PROBE STATUS LED (green, red)............................................2.3
ERROR LED (red, blue, yellow) ..............................................2.3
SIGNAL CONDITION LED (red, yellow, green) ..................................2.3
ACTIVE SYSTEM LEDs (green) .............................................2.3
OMI-2H inputs ..............................................................2.4
OMI-2H output..............................................................2.4
OMI-2H output waveform .....................................................2.5
Switch SW2................................................................2.6
Switch on / switch off ......................................................2.7
OMI-2H dimensions..........................................................2.8
OMI-2H specification.........................................................2.9

OMI-2H installation guide
ii
Contents
System installation ...........................................................3.1
Mounting bracket (optional)....................................................3.1
Wiring diagram .............................................................3.2
OMI-2H cable ..............................................................3.3
Cable sealing ............................................................3.3
Fitting flexible conduit......................................................3.4
Screw torque values Nm (lbf.ft) .................................................3.5
Maintenance .................................................................4.1
Maintenance ...............................................................4.1
Removing the OMI-2H window .................................................4.2
Fitting the OMI-2H window ....................................................4.3
Fault-finding .................................................................5.1
Parts list .....................................................................6.1

1.1
Before you begin
Disclaimer
WHILE CONSIDERABLE EFFORT WAS MADE TO VERIFY THE ACCURACY OF THIS DOCUMENT
AT PUBLICATION, ALL WARRANTIES, CONDITIONS, REPRESENTATIONS AND LIABILITY,
HOWSOEVER ARISING, ARE EXCLUDED TO THE EXTENT PERMITTED BY LAW.
RENISHAW RESERVES THE RIGHT TO MAKE CHANGES TO THIS DOCUMENT AND TO THE
EQUIPMENT, AND/OR SOFTWARE AND THE SPECIFICATION DESCRIBED HEREIN WITHOUT
OBLIGATION TO PROVIDE NOTICE OF SUCH CHANGES.
Trade marks
RENISHAW® and the probe symbol are registered trade marks of Renishaw plc. Renishaw
product names, designations and the mark ‘apply innovation’ are trade marks of Renishaw plc or its
subsidiaries.
Other brand, product or company names are trade marks of their respective owners.
Warranty
Unless you and Renishaw have agreed and signed a separate written agreement, the equipment
and/or software are sold subject to the Renishaw Standard Terms and Conditions supplied with such
equipment and/or software, or available on request from your local Renishaw office.
Renishaw warrants its equipment and software for a limited period (as set out in the Standard Terms
and Conditions), provided that they are installed and used exactly as defined in associated Renishaw
documentation. You should consult these Standard Terms and Conditions to find out the full details of
your warranty.
Equipment and/or software purchased by you from a third-party supplier is subject to separate terms
and conditions supplied with such equipment and/or software. You should contact your third-party
supplier for details.
CNC machines
CNC machine tools must always be operated by fully trained personnel in accordance with the
manufacturer's instructions.

OMI-2H installation guide
1.2
Before you begin
Care of the interface
Keep system components clean.
Patents
None applicable.
Intended use
The OMI-2H, which acts as a combined optical transceiver and machine interface, converts signals
from the optical probe into a voltage-free solid state relay (SSR) output for transmission to the CNC
machine controller.
Safety
Information to the user
In all applications involving the use of machine tools, eye protection is recommended.
The OMI-2H has a glass window. Handle with care if broken to avoid injury.
Information to the machine supplier/ installer
It is the machine supplier’s responsibility to ensure that the user is made aware of any hazards
involved during operation, including those mentioned in Renishaw product literature, and to ensure that
adequate guards and safety interlocks are provided.
If the probe system fails, the probe signal may falsely indicate a probe seated condition. Do not rely on
probe signals to halt the movement of the machine.
Information to the equipment installer
All Renishaw equipment is designed to comply with the relevant EC and FCC regulatory requirements.
It is the responsibility of the equipment installer to ensure that the following guidelines are adhered to,
in order for the product to function in accordance with these regulations:
•any interface MUST be installed in a position away from any potential sources of electrical noise,
(for example power transformers, servo drives);
•all 0V/ground connections should be connected to the machine “star point” (the “star point” is a
single point return for all equipment ground and screen cables).This is very important, and failure
to adhere to this can cause a potential difference between grounds;
•all screens must be connected as outlined in the user instructions;
•cables must not be routed alongside high-current sources, (for example motor power supply
cables), or be near high-speed data lines;
•cable lengths should always be kept to a minimum.
•the dc supply to this equipment must be derived from a source which is approved to
BSENIEC62368-1

1.3
Before you begin
Equipment operation
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired.
Optical safety
This product contains LEDs that emit both visible and invisible light.
OMI-2H is ranked Risk Group: Exempt (safe by design).
The product was evaluated and classified using the following standard:
BS EN 62471:2008 The photobiological safety of lamps and lamp systems.
Renishaw recommends that you do not stare at or look directly into any LED device, irrespective of its
risk classification.

OMI-2H installation guide
1.4
Before you begin
This page is intentionally left blank.

2.1
Introduction
The OMI-2H is a combined optical receiver and machine interface which is designed to be mounted
within the machine’s working envelope.
The OMI-2H operates using a ‘Modulated’ optical transmission mode and is compatible with machine
probes that also operate in ‘Modulated’ mode.
Power supply
The OMI-2H can draw its supply from the CNC machine’s nominal 12 Vdc to 30 Vdc supply.
The maximum peak supply current is 160 mA when the OMI-2H is transmitting. The average supply
current is 40 mA when the OMI-2H is receiving.
The values quoted are for a 24 Vdc supply and assume all outputs are open circuit.
CAUTION: This equipment will only perform to specication if the power supply 0 V is connected to
the machine ground (“star point”).
Input voltage ripple
The input voltage ripple must not cause the voltage to fall below 12 V or rise above 30 V.
OMI-2H basics

OMI-2H installation guide
2.2
OMI-2H basics
OMI-2H visual diagnostics
A visual indication of system status is provided by
LEDs. Indication is provided for:
•START;
•LOW BATTERY;
•PROBE STATUS;
•ERROR;
•SIGNAL;
•ACTIVE SYSTEM.
ERROR LED
PROBE STATUS LED
LOW BATTERY LED
SIGNAL LED
START LED
NOTE: Keep the window clean (For more information see Section 4, “Maintenance”).
ACTIVE SYSTEM
LED
ACTIVE SYSTEM
LED