SKF CMSS 785 Series User manual

User manual
Eddy Current Probe Systems
CMSS  Series, API- Proximity transducers,  and  mm

Thank you for purchasing the CMSS  Proximity Transducer Sys-
tem.This instruction manual (referred to as “this manual” hereafter)
explains handling instructions and precautions to be taken in respect
of the CMSS Transducer system (referred to as “this unit”
hereafter).
Read this manual carefully before using the unit. If you have any
questions regarding this manual or the unit, please contact SKF
technical support group.
Product support – contact information
Product support – To request a Return Authorization, Product Cali-
bration or a Product Support Plan, go to skf.com/cm and use the
contact and support links on the web site.
Product sales – For information on purchasing condition monitoring
products, services or customer support, contact your local SKF sales
office.
Technical support group
Discuss/review issues of specific interest with maintenance and relia-
bility specialists from around the world at the Knowledge Centre’s
“forum and blog”. For technical support on issues like troubleshoot-
ing product installation or product performance, etc., use our techni-
cal support web page to contact one of our technical support groups.
• When using this product, it is necessary to be not only knowledge-
able about the contents of this manual, but also in respect of other
instrumentation and equipment connected to this unit. For safety,
it is necessary to be familiar with safe working practices and proce-
dures, appropriate to the installation site.
• Whilst the CMSS  series has been comprehensively evaluated
in respect of EMC (electro-magnetic compatibility), test and real
world conditions can differ substantially because of:
–Intensity/source of EMI (interference)
–Temperature and humidity
–Equipment layout
So, it remains important to observe the precautions and follow the
instructions contained in this manual.
• This unit is comprised of the following components:
–CMSS / sensor (referred to as probe hereafter)
–CMSS  cable (hereafter known as extension cable)
–CMSS  transducer (referred to as driver hereafter)
Only specific combinations of these components can be used to build
a measurement system. For guidance and examples, refer to section
..
• This manual contains some explanations for supplementary parts
(sold separately), in order to explain their relationship to this unit.
• Any illustrations in this manual of such parts, should only be
regarded as illustrative and not definitive as to their actual appear-
ance, dimensions etc.
• Any company names and product names listed in this manual are
the trademarks or registered trademarks of their respective
companies.
• When disposing of this product, make sure to follow all local laws
and regulations.
Important information



Important information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1. Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
.. Warning symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Important precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
. Measurement principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Permissible system combinations . . . . . . . . . . . . . . . . . . . . . 
3. Part no. and dimensional data . . . . . . . . . . . . . . . . . . . . . . . 9
. Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Extension cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
4. Installation guidelines/planning . . . . . . . . . . . . . . . . . . . . . . 16
. System installation requirements . . . . . . . . . . . . . . . . . . . . . 
. EMC considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Connections to the monitoring system . . . . . . . . . . . . . . . . . 
5. Fitting system components . . . . . . . . . . . . . . . . . . . . . . . . . . 23
. Probe and Extension Cable installation . . . . . . . . . . . . . . . . . 
. Driver installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Making connections to the monitoring system . . . . . . . . . . . 
. Probe gap voltage confirmation . . . . . . . . . . . . . . . . . . . . . . . 
6. Service/inspection recommendations . . . . . . . . . . . . . . . . . 31
. Periodic inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Unit life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
7. Information about intrinsically safe applications . . . . . . . . 33
. CSA Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. System drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. System drawing, cont. . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Label information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. ATEX Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. System drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Applicable standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Label information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Appendix A – product specifications . . . . . . . . . . . . . . . . . . 37
A – Frequency response graph . . . . . . . . . . . . . . . . . . . . . . . . . . 
Appendix B – Influences on the output characteristic . . . . . . 39
B – Standard static characteristic. . . . . . . . . . . . . . . . . . . . . . . . 
B – Sensor temperature characteristics ( m system). . . . . . . . 
B – Driver temperature characteristics ( m system) . . . . . . . . 
B – Effect due to driver supply voltage variation . . . . . . . . . . . . 
B – Response to different target materials . . . . . . . . . . . . . . . . 
B – Effect due to target diameter . . . . . . . . . . . . . . . . . . . . . . . . 
B – Effect of a curved target surface . . . . . . . . . . . . . . . . . . . . . 
B – Effect due to (abrupt) target edge . . . . . . . . . . . . . . . . . . . . 
B – Effect due to the proximity of a side wall . . . . . . . . . . . . . . . 
Appendix C – Cable wiring/laying recommendations. . . . . . . 48
Appendix D – Limited Warranty. . . . . . . . . . . . . . . . . . . . . . 50
Contents





. Safety information
Read this section carefully in order to be able to use this product safely.
.. Warning symbols
In this document, rules that must be followed in order to prevent injury or financial loss and for
the safe usage of this unit, are labeled with the following markings. Make sure to understand the
content of these cautions and to follow the guidance provided.
WARNING
This symbol is used to warn of the possibility of injury. Always
follow the instructions to ensure safety.
CAUTION
This symbol is used to draw attention to the potential for dam-
age. Always follow these instructions to prevent damage to
equipment.
DANGER
This symbol is used to warn against the possibility of serious or
fatal injury. Always follow the instructions to ensure safety.
NOTE
This symbol is used to emphasize important items or to provide
useful information.



Rules to follow
. Important precautions
Be sure to observe the following instructions for safe use of this unit.
Prohibited actions
DANGER
Never disassemble or modify this unit.
Do not use the unit under conditions outside the limits detailed
in the specifications. Doing so may lead to equipment failure,
fire, or personal injury.
CAUTION
Do not use transceivers and other radio equipment/cellular
phones in close proximity to this unit. If it or the signal cables are
exposed to EMI (Electromagnetic Interference), the unit may not
satisfy the precision and performance characteristics indicated
in the specifications.
DANGER
When installing this unit, be sure to follow the procedures
described in sections  and . If the procedures indicated are not
followed, it may lead to failures of the unit, fires, or personal
injury.
CAUTION
• Before operating this unit, be sure to also read the instruction
manuals for instruments that will be connected to this unit (IMx/
monitoring equipment).
• Installation work, wiring and connections must be performed by
a person with appropriate knowledge of and experience in,
instrumentation systems.
• Before physically handling this unit, be sure to touch a grounded
metal item to discharge any static electricity. The device may be
damaged if exposed to static discharges.
• Do not perform insulation resistance measurements or voltage
endurance tests at locations other than those with insulation
resistance and voltage endurance specifications indicated. Doing
otherwise, may damage the unit.
• If performing a megger test (insulation test) of the signal trans-
mission cable, always disconnect the cable from the unit and the
monitor. When reconnecting the cable, first short it to ground so
as to discharge any remaining potential. Connecting cables to
the unit or the monitor in a charged condition, may damage that
equipment.
• Perform the following measures to ensure the stability of the
system.
–Be sure to install surge suppressors for each and every relay
used in the vicinity of this system.
–Include provision for the measuring loop to be bypassed or
inhibited at the monitoring system so that maintenance/fault
finding can be performed.
• If there is any likelihood of EMI (interference), the driver should
be placed inside an EMC shielding enclosure. Section . shows
a typical arrangement with probe and monitor cables also run
within grounded conduit.
• If any one of the following conditions occurs, stop using the unit
and contact support.
–There is a strange odor coming from the unit.
–It is heating up abnormally.
–If the unit has been dropped.
–The casing of the unit has been damaged.
Continuing to use the unit in an abnormal condition may result in
fires or further failures.
• Store this unit in a location away from direct sunlight, under the
following conditions.
–Temperature within the range: – to  °C
–Humidity:  to % RH (no condensation)
Do not store in a location exposed to high temperatures and/or
humidity, or where corrosive gasses are present.



. Introduction
. Measurement principles
This unit (probe, extension cable, driver system) provides a means for non-contact measure-
ment of the distance (gap) between the probe tip and the measured object (target), by out-
putting a voltage signal corresponding to that gap.
CMSS 75 Probe
CMSS 78 Probe
CMSS 785 Driver
CMSS 985 Extension cable
CMSS 985 Extension cable
System cable length,  m or  m
Connector
Connector
An oscillator in the driver provides a high frequency signal (circa  MHz) that radiates from a
coil encapsulated in the probe tip.
As a conductive surface approaches the coil, eddy currents are generated on the target, and
this in turn causes a detectable decrease in the field’s strength that is reflected by a corre-
sponding decrease of the driver’s output.
The driver linearizes and normalizes its output to a standard sensitivity; , mV/m
(200 mV/mil), across its working range.
The signal’s DC bias represents the average probe gap or position and its AC component, the
relative motion or vibration. It is readily used in many applications concerned with machinery
monitoring.
-24
-20
-16
-12
-8
-4
0
0,0 0,5 1,0 1,5 2,0 2,5
Output [V]
Gap [mm]


. Applications
When suitably installed and combined with an appropriate (IMx) monitoring system, it is pos-
sible to measure the vibration of a rotating shaft, its eccentricity, (thrust) position, rotating
speed or to provide phase data etc.
The unit aims to facilitate continuous measurement or monitoring of shafts rotating at either
high or low speeds, across a range of machine types. This unit is not designed for use in any
other application.
. Permissible system combinations
The unit can be provided as either a  or  m system. This refers to the total, nominal, cable
length being used irrespective of whether this is made up solely of probe cable or probe and
extension cabling. In each case an appropriate  or  m driver completes the system. Only the
component combinations shown in the graphic below are allowed.
CMSS  or
CMSS  probe +
CMSS 
extension cable
=
System
cable
length
→
CMSS  driver
A B C
, m + , m =  m →CMSS -/-
, m + , m =  m →CMSS -/-
, m – =  m →CMSS -/-
, m + , m =  m →CMSS -/-
, m + , m =  m →CMSS -/-
, m – =  m →CMSS -/-
AB C
Any excess cable is typically coiled and tied, and doing so does not affect the measurement
capability or performance of the system.
NOTE
Performance specifications for the system are presented in Appendix A, noting that a
non-functioning/non-conforming system will result from:
• Any combination of system components that results in a system length that is not  or  m.
• A  m driver being used in a  m system (or vice versa).
• The shortening or lengthening of the cable between the probe and driver.
• The inclusion of any non-CMSS  system components, including from earlier SKF
systems.



. Part no. and dimensional data
. Probes
Three basic probe types are available: a  mm diameter tip,  mm tip and a reverse mount  mm
tip. These three are mechanically different but electrically equivalent: when considering permis-
sible system combinations only the cable length has to be considered, as described in . above.
Note that as indicated on the dimensional drawings, the actual physical length of probes and
cables may be longer than but not shorter than, the nominal length.
3.1.1 Probes: 5 mm
C M S S 7 5 - - - -
CMSS 75: 5 mm probe
Armor
LWithout armor
A With armor (without
fluoro resin coating)
Thread size
M M×
U /- UNF
Unthreaded length (if M1)
 mm increments,
– mm; L ≤ L– mm
e.g. 06 =  mm
Unthreaded length (if U1)
. inch increments, –. in
L ≤ L – . inches
e.g. 04 = . inches
Case length (if M1)
 mm increments, – mm
e.g. 25 =  mm
Case length (if U1)
. in increments, .–. inches
e.g. 35 = . inches
Cable length
 , m
 , m
 , m
 , m
L1 L2 L3


Example
CMSS 75-LM1-06-25-10  mm, no armour, thread size Mx, unthreaded length (L)  mm ( =  mm),
case length (L)  mm ( =  mm), cable length (L) , m
+30%
–0%
L
3
5 (0.2˝)
∅5 (0.2˝)
3 (0.12˝) L
1
5
(0.2˝)
L
2
∅7,1 (0.28˝)
Cable ∅ , ConnectorSensor tip Lock nut Threaded area
CMSS 75-L standard probe (without armour)
Example
CMSS 75-AU1-02-10-05  mm, armour, thread size UNF /-, unthreaded length (L) . in,
case length (L) . in, cable length (L) , m
+50 mm
–100 mm
L
3
5 (0.2˝) 5
(0.2˝)
3 (0.12˝)
∅5 (0.2˝)
L
1
20 (0.8˝)L
2
+30%
–0%
L
3
∅7,1 (0.28˝)
50
(1.97˝)
4,5
Cable ∅ , ConnectorSensor tip Lock nut Threaded area Flexible armour
CMSS 75-A armoured probe


3.1.2 Probes: 8 mm
C M S S 7 8 - - - -
CMSS 78: 8 mm probe
Armor
LWithout armor
A With armor (without
fluoro resin coating)
Thread size
M M×
U /- UNF
Unthreaded length (if M2)
 mm increments, – mm;
L ≤ L– mm
e.g. 06 =  mm
Unthreaded length (if U2)
. inch increments, –. in
L ≤ L – . inches
e.g. 04 = . inches
Case length (if M2)
 mm increments, – mm
e.g. 25 =  mm
Case length (if U2)
. in increments, .–. inches
e.g. 35 = . inches
Cable length
 , m
 , m
 , m
 , m
L1 L2 L3


Example
CMSS 78-LU2-00-12-10  mm diameter probe, no armour, /- UNF thread,
unthreaded case length (L)  in, case length (L) . in, pigtail cable length (L)  m
50
(1.97˝)
+30%
–0%
L
3
∅8 (0.31˝)
L
1
54,5
L
2
∅7,1 (0.28˝)
5 (0.2˝)
3 (0.12˝)
Sensor tip Cable ∅ , Connector
Lock nut Threaded area
CMSS 78-L standard probe (without armour)
Example
CMSS 78-AM2-04-20-90  mm diameter probe, armoured, Mx thread, unthreaded case length (L)  mm,
case length (L)  mm, pigtail cable length (L) , m
∅8 (0.31˝)
L
1
5
(0.2˝)
20
(0.8˝)
L
2
∅7,1 (0.28˝
)
+50 mm
–100 mm
L
3+30%
–0%
L
3
50
(1.97˝)
4,5
∅8,6 (0.34˝)
5 (0.2˝)
3 (0.12˝)
Without fluoro resin coating
Cable ∅ , Connector
Sensor tip Lock nut Threaded area Flexible armour
CMSS 78-A standard probe (with armour)


3.1.3 Probes: 8 mm reverse mount
C M S S 7 8 - R - - -
CMSS 78-R: 8 mm reverse mount probe
Thread size
M M×
U /- UNF
Unthreaded length
 =  mm
 = . inches
Case length
 =  mm
 = . inches
Cable length
 , m
 , m
 , m
 , m
L1 L2 L3
Example
CMSS 78-RM2-05-03-05  mm probe, reverse mount, thread size Mx, unthreaded length (L)  mm,
case length (L)  mm ( =  mm), cable length (L) , m
CMSS 78-RU2-02-12-90  mm probe, reverse mount, thread size /- UNF, unthreaded length (L) . in,
case length (L) . in ( = . in), cable length (L) , m
+30%
–0%
L
3
5 (0.2˝) 5
(0.2˝)
∅8 (0.31˝)
30 (1.18˝)
∅7,1 (0.28˝)
5 (0.2˝)
Cable ∅ , ConnectorSensor tip
CMSS 78-R reverse mount
Threaded areaPacking


. Extension cables
Extension cables are chosen such that the probe + extension cable lengths match the desired
system length ( or  m). If a probe with a full system length integral cable is used, no exten-
sion cable is required/can be used.
C M S S 9 8 5 - -
CMSS 985
Armor
LWithout armor
A With armor (without
fluoro resin coating)
Cable length
 , m
 , m
 , m
 , m
L
+20%
–0%
L
∅6,8 (0.27˝) ∅7,1 (0.28˝)
∅3,6 (0.14˝)
+50 mm
–200 mm
L
∅6,8 (0.27˝)
+20%
–0%
L
∅7,1 (0.28˝)
∅8,6 (0.34˝)
CMSS 985-L extension cable without armour
CMSS 985-A extension cable with armour
Connector Cable Connector
Connector Cable Flexible armour Connector
Extension cables
Example
CMSS 985-L-40 No armour, not agency approved, , m length
CMSS 985-L-45 No armour, not agency approved, , m length
CMSS 985-L-80 No armour, not agency approved, , m length
CMSS 985-L-85 No armour, not agency approved, , m length
CMSS 985-A-40 Armoured, not agency approved, , m length
CMSS 985-A-45 Armoured, not agency approved, , m length
CMSS 985-A-80 Armoured, not agency approved, , m length
CMSS 985-A-85 Armoured, not agency approved, , m length


. Drivers
In addition to the two available system lengths, the drivers can be provided with a choice of
mechanical mounting.
C M S S 7 8 5 -
CMSS 785
System cable length
 m
  m
Mounting plate
DIN rail ( mm) mount
 Screw mount, multi-pitch (, × , mm and  ×  mm)
CMSS 785-11, CMSS 785-21
Unit: mm
29 (1.14˝)
35
(1.4˝)
32 (1.26˝) 40 (1.57˝)
72 (2.8˝) 6
(0.24˝)
68
(2.7˝)
Terminal block
Sensor input
connector
Mounting
plate
CMSS 785-12, CMSS 785-22
Unit: mm
29 (1.14˝)
61 (2.4˝)
5 (0.2˝)
31
(1.22˝)
50.8
(2.0˝)
50.8 (2.0˝)
92 (3.6˝)
4x ∅4.5
(0.178˝)
4x ∅4.5 (0.178˝)
64
(2.52˝)
72 (2.83˝) 15
(0.6˝)
15
(0.6˝)
102 (4.0˝)
Terminal block
Sensor input
connector
Mounting plate


. Installation
guidelines/planning
CAUTION
• Locate the driver away from motors and relays. Install the input/output signal cables
away from power and control system cables. Noise occurring due to motor or relay
operation can adversely affect the unit.We recommend using separate wiring ducts.
• Allow sufficient space in housings etc. to respect the minimum allowed bend radius of
the probe and extension cables:
–Without armoured cable:  mm
–With armoured cable:  mm
NOTE
For information regarding typical/recommended cable wiring and installation methods,
refer to Appendix C: “Cable wiring/laying recommendations”.



. System installation requirements
Major considerations include temperatures, pressures and mechanical stress to which the
probe, driver and cables are subjected. It is essential that the probe be rigidly mounted, yet
easily adjusted (SKF mounting accessories are ideal for this).
The target material, target surface finish, flatness and size can all affect the output character-
istic. It is expected that the target area will have been prepared so as to minimize both
mechanical and electrical run-out, that may otherwise cause a false vibration indication.
In Appendix B, the effect that the precise nature of the target, operating environment etc. can
have on the system output characteristic is quantified by way of examples B through B.
Further guidance on the installation requirements for probes is given in .. and ...
4.1.1 General
4.1.2 Probes used for speed/phase detection
Special recommendations are made for target sizing where the probe is to be used for speed
or phase detection. Three scenarios are shown:
1 Multi-tooth or multi target wheel (speed only)
2 Raised, single target for speed and/or phase detection
3 Single slot target for speed and/or phase detection
DD
C
B
A A
C
DB
C
Dimension of target (recommended for rotational speed measurement) Set gap (recommended)
mm mm
A ≥  , to ,
B ≥ 
C ≥ 2,5
D ≥ 


4.1.3 Probe mounting
Ensure that the probe mounting location satisfies the following environmental and installa-
tion requirements.
Environmental conditions
• Probe temperature: must always be in the range between – to  °C.
• Vibration levels at the probe: must be  m/sor less ( to  Hz), noting however that if
the sensor vibrates, an accurate measurement cannot be made.
• Locate the probe so as to avoid immersing it in fluid (particularly the probe cable/cable exit)
Installation conditions
• The probe must be installed on a surface or bracket with adequate rigidity, that will not
allow the probe to vibrate. If the probe vibrates, an accurate measurement of the target/
shaft will not be possible.
• The field radiating from the probe tip extends out from the probe tip in all directions. To
maintain the nominal characteristic, a minimum target diameter of  mm, centered on
the probe is required.
• Similarly, when placing probes near to each other, separate the sensor tips as shown
below. If they are placed too close together, the probes will interfere with each other.
∅  mm
or more
 mm
or more
 mm or more
Target
Target
• For the preferred detailing of the probe mounting, refer to the installation examples –
below. If the mounting or other metal object other than the target is near the probe/within
the field, the measurement will be affected.
To ease probe mounting and adjustment, various accessories are separately available:
•
CMSS VZ-A probe mounting bracket (versions for  and  mm probes, metric/UNF threads)
• CMSS VZ-A sensor sleeve (for  mm reverse mount probes)
• CMSS VZ-A sensor housing (usable with ,  mm and reverse mount probes)
See section . for examples of how these mounting accessories can be utilized.
If it is unavoidable to install the probe in a non-ideal way (examples  to ), some guidance is
given on the likely effect. In case of any doubt, where possible, perform an in-situ check of
the actual characteristics of the installation.
Be aware that the probe/driver output will not reduce to zero volts, and that the probe should
not be used/relied upon in situations where the gap between probe and target is small
(. mm or less, example ).



X
X
Y
X
Y
X
Dimension X is to be
 mm or more.
Target
Attachment plate
Probe
Target
Dimension X is to be
 mm or more.
Dimension Y is to be
 mm or more.
Installation example 1 (most recommended)
Installation example 2 (recommended)
Target
Target
Target
Target
After constructing as
shown in installation
example , the area shown
by the shaded line in the
illustration is filled with
resin or other insulating
material.
If dimension X is less than
 mm, it will be affected by
the attachment plate.
If dimension Y is less than
 mm, it will be affected
by the attachment plate.
If the attachment plate
around the sensor tip is
chamfered, it will be
affected by the attachment
plate.
If the target and the sensor
tip are not parallel (dimen-
sion X and X are not the
same), it will affect the
reading.
If dimension X is , mm
or less, measurement will
not be possible. The area
, mm or less is a
non-sensitive area.
Installation example 3 (recommended)
Installation example 4
Installation example 5
Installation example 6
Installation example 7
Installation example 8
X2
X1
Install example  to 
Install example  to 
Install example 
Output, V
Non-sensitive area
(be careful of this area)
Gap, [mm]
The characteristics of output (V) and gap [mm]
Target
Target
Recommended
For further information, refer Appendix B:
Influences on the Output Characteristic.
System characteristic affected


CMSS 785-12, CMSS 785-22
Unit mm
4.1.4 Driver
The driver should be installed in a location that satisfies the following environmental and
installation requirements.
Environmental conditions
• Temperature: the temperature of the driver must remain within the range – to  °C.
• Ambient humidity: must be in the range  to % RH (non condensing).
• Vibration levels at the driver: must be  m/sor less ( to  Hz).
• Air cleanliness: it is desirable to have an air dust particle amount of , mg/mor less. It is
also desirable to have an especially low concentration of corrosive gasses such as hydrogen
sulfide, NOx gas, and chlorine, and conductive particles such as iron dust and carbon. (The
allowable amount of hydrogen sulfide and NOx gas is based on JEIDA- () CLASS S.)
JEIDA: Japanese Electronic Industry Development Association
–JEIDA- () CLASS S
–Hydrogen sulfide: , ppm or less
–NOx gas: , ppm or less
–(Ambient temperature:  °C ±  °C, humidity:  to % RH)
Installation conditions
• Do not locate the driver enclosure directly above heat sources.
• Take into account both conducted and radiated heat from the machine, when it is running
and when it is shutting down.
The driver is not weatherproof, so always mount it in a suitable cabinet or enclosure, see also
the EMC considerations that follow in section ..
The detail of the driver mounting differs according to the model chosen:
CMSS 785-12 and CMSS 785-22 are screw mounting
The driver/mounting plate assembly offers two mounting options to the user’s enclosure/
panel:
• x mounting holes on a , mm pitch, or
• x mounting holes on a  x  mm pitch
All mounting holes are , mm diameter, refer drawing below.
31
(1.22˝)
50.8
(2.0˝)
50.8 (2.0˝)
92 (3.6˝)
4x ∅4.5
(0.178˝)
4x ∅4.5 (0.178˝)
