SPM Machine Guard MG4-REF11A User manual

SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Instruction Manual
Machine GuardTM MG4-REF11A

SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Machine GuardTM MG4-REF11A
Contents
Safety Precautions ................................................................. 2
Machine Guard MG4-REF11A................................................ 3
General................................................................................... 4
Mechanical installation ........................................................... 5
Electrical installation of MG4.................................................. 6
Connection to PLC via analog output..................................... 8
Programmed measuring parameters ...................................... 9
Reset default parameters ..................................................... 10
The VERSION menu, version and setup................................ 11
The VERSION menu, password and stand-by....................... 12
Programming a vibration channel......................................... 13
Programming a SPM channel................................................ 15
Automatic adjusting of gain ................................................. 16
The effect of alarm delay...................................................... 17
Vibration transducers............................................................ 18
Vibration transducer installation ........................................... 19
Installation of shock pulse transducers ................................. 20
Installation of vibration transducers...................................... 21
VIB – Vibration severity monitoring ...................................... 22
Machine classes .................................................................... 23
VIB Transducers, Series SLD .............................................. 24
VIB Transducers, Series TRV.................................................. 25
Standard cables for transducers ........................................... 26
SPM transducer 42000.......................................................... 27
Technical specifications......................................................... 28
Trouble Shooting .................................................................. 30

SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
2Safety Precautions
1. Safety Arrangements
1:1. General
All persons performing installation or service
on rotating machines and electrical equipment
should be authorised and familiar with general
safety rules and IEC symbols as well as local
requirements, rules and regulations. In case of
doubt the local management should be con-
sulted.
SPM will not be responsible for any accident
caused by persons not observing this Safety
Precautions.
When performing installation or service on
machines in potentially explosive atmosphere,
the requirements according to ATEX EN 60079
should be followed.
1:2. Disconnection
Before starting installation work on machines,
make sure that main power is off and will stay
off until the work is done. Do not simply pull the
switch - remove the fuses, lock the fuse box, put
up warning signs. Check all terminals to ensure
that the equipment is voltage free by using a
voltage tester.
1:3. Electrical Installation
Always read the instructions delivered with the
equipment before performing installation or ser-
vice on electric equipment. If you are in doubt,
please contact your local SPM representative
before installing the equipment. Damage of the
equipment caused by incorrect installation is not
covered by product warranty. Before starting
installation work, make sure that the main power
switch is in off position and will stay off until the
work is done. Check that all terminals, marked
with protective earth IEC symbol, are properly
connected to the protective earthing conduc-
tor of the building installation wiring. In some
countries, the term "protective grounding" is
used instead of "protective earthing". Earth and
ground are used synonymous in this installation
instruction. Choose installation tools that are
safe and suitable for its working environment.
Electrical risks can sometimes be eliminated by
using air, hydraulic or handpowered tools. These
are especially useful in harsh conditions.
1:4. System Components
To ensure optimum safety for user and environ-
ment, only original system components available
from SPM should be used. When using non-
original components, the compliance with EU
directive with respect to electric safety, EMC
and machine safety is not guaranteed by SPM.
1:5. Reapplying Power
For human safety, ensure the electrical equip-
ment or installation is electrically safe. Before
starting the machine, make sure that all protec-
tion covers on the machine are mounted and
secured.
2. Installation Precautions
2:1 Installation of Measuring Units and
Measuring Terminals
Measuring units and terminals should be located
in a protected position assigned by the local
management. The units shall be easily accessible
for undisturbed measurements and service. Sig-
nal cables should not be located close to power
supply cables. The measuring equipment should
be intended and specified for use in existing
environment.
It is important that you read the operating
instructions completely and follow all safety
precautions before operating the measuring
units. Electrical connections and wiring should
be performed only by suitably trained personnel.
2:2 Work Regulations
All personnel should be provided with the local
work regulation before any work is commenced.
It is important that parts of metal, rubber and
plastics are dumped in special containers. Such
parts can cause bad accidents and production
disturbances if dropped on the wrong place.
From an environmental point of view, wrapping
materials should be collected so as not to cause
damage.
Precautions should also be taken when drill-
ing, tapering and grinding to avoid chips and
grindings causing accidents and production
disturbances.
2:3 Inspection and Acceptance
Inspection of transducer positioning, connec-
tions, cable laying, TMU installations and strap-
ping should take place after finished installation.
The cables should be marked in accordance with
agreement with the local contact. Inspection
protocol in accordance with the local regulations
should be used.
IEC symbols
Risk for electric shock Caution
Rotating parts Protective earth

Machine Guard MG4-REF11A 3
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
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Machine Guard MG4-REF11A
Machine Guard MG4-REF11A is a continuous monitoring unit. It measures vibration severity (VIB)
and the mechanical shocks (SPM) arising when the disc segments in a refiner touches each other.
It provides, for each channel:
• Status display (green - red light) and system fault (yellow light)
• Display of measured value with continuous updates
• Analog output current 4 - 20 mA with programmable range
• Relay action at two programmable alarm levels (red alarm)
When the unit is in its normal measuring mode, the green - red status light shows the status of the
channel with the worst condition. The yellow status light indicates system fault. The display shows
the measuring result on both channels.
On pressing SET, the cursor will be on channel 1 and the status light will correspond to the result
on channel 1. With SET one can step through all channels.
Pressing LEFT or RIGHT opens a window where you can see the instrument version, set measuring
unit and contrast, disable the TLT alarm and switch off the measuring function.
Pressing ENT starts the programming mode for the selected channel. This is password protected.
With the password set to ON, you can see the channel configurations but are unable to make
changes.
Vibration channel /
Shock pulse channel
Power supply
230/115 Vac
Relays,
250 V (1), 125 V (4)
4 - 20 mA
analog out (4)
Push ENT to
see setup
for channel
selected
with SET
Push SET to select
channel status display
Status light
for channel
with worst
condition
Push RIGHT
for VERSION
menu
Measuring results,
all connected channels
REF11A
VIB 1.5 mm/s
SPM 40 %

4 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
General
A contact of the disc segments can be prevented using the SPM Shock Pulse Method. A shock pulse
transducer measures the mechanical shocks arising when the disc segments touches each other.
A shock pulse transducer (A) is fixed to the refiner housing so that mechanical shocks from the
segments are transmitted to the transducer with a minimum of reduction. The transducer signal
is transmitted via the cables to the MG4-REF11A electronics which analyses the frequency of oc-
currence and magnitude.
During normal operation the instrument reading is 20 - 60 %. If the discs run together, the meas-
ured value exceeds an alarm limit (see default settings) and a relay is activated which gives signal
to open the disc gap.
A vibration transducer (B) is also fixed to the refiner housing. The vibration measurement returns
one value (mm/s RMS) according to ISO standard 2372.
The measuring results can be put on any of the available analog output channels and connected
with any of the relays.
The MG4-REF11A includes one relay 250 Vac / 5 A /1250 VA and four relays 125 Vac / 1 A / 60 VA
(150 Vdc / 1 A / 30 W).
One analog output for the VIB channel and three for the SPM channels are supplied. The MG4-
REF11 is the active unit in the 4-20 mA loop and is feeding about 10 V DC to the PLC or the devices
in the loop. Including cable resistance, the max. loop resistance is 400 Ω.
Please note: The vibration frequency range is factory set 10 – 1000 Hz and cannot be changed
by the user.
B
A

Machine Guard MG4-REF11A 5
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Mechanical installation
The MG4-REF11A is designed for wall mounting. It is fastened with 4 screws, the screw hole di-
ameter is 4 mm.
If possible, do not mount the unit against vibrating machine parts. The max. continuous vibration
level should not exceed 5 mm RMS.
The casing material is polycarbonate/PVC, dimensions 200 x 144 x 77 mm. The casing is classed
IP65. The cable inlet M12 for vibration measuring cable is tight for cable diameters 3 to 6.5 mm.
The cable inlet Pg11 is tight for cable diameters 5.5 to 10 mm.
The temperature range of the MG4-REF11A is 0 to 50 °C (32 to 122 °F).
The maximum length of the transducer cables is 100 m for SPM shock pulse transducers type 42000.

6 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
↑↑
Power
RelaysAnalog current
SPM transducer
VIB transducer
Front panel Fuse (F):
230 VAC = T32 mA
115 VAC = T32 mA
Protective
earth
Main power switch
or circuit-breaker
F
230 VAC (115 VAC)
Make sure that the main power switch is
in off position and will stay off until the
work is done. Lock the switch if possible.
Cable inlets Pg11
Electrical installation of MG4
To connect an MG4-REF11A, remove the lower part of the front panel. The terminals of type push-
in for power supply and outgoing signals are situated beneath the lower part of the instrument
panel. Switch off the main power switch before removing the panel. A label on the rear side of the
cover shows the channel layout.
Power supply
The supply voltage can be 230 V AC or 115 V AC. Note that the power connection is labelled with
the factory set supply voltage for the unit. The fuse is a slow glass tube fuse rated T32mA. The
cable inlets (Pg11) are tight for cable diameters 5.5 to 10 mm. An adequately rated power cord
should be used.
The supply power should come via an external main power switch or a circuit-breaker, from a
power source with an even load (nominal voltage ± 10%, no excessive transients). The switch or
circuit-breaker must be suitably located and easily reached. It must be marked as the disconnecting
device for the equipment. See the figure above for connection to mains power terminals. Check
that the unit is connected to protective earth, marked with IEC symbol, and that protective earth
is properly connected to the protective earthing conductor of the building.
Read the Safety Precautions on page 2 before performing electrical installation. If you are in doubt,
please contact your local SPM representative before installing the equipment.

Machine Guard MG4-REF11A 7
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Transducer inputs
The coaxial cable from the shock pulse transducer is connected to a TNC connector on the underside
of the MG4-REF11A unit. The vibration transducer is connected via a shielded twisted pair cable
to the input terminals on the circuit board inside the unit (fig.1) or to a TNC connector (option)
underside of the unit. The TNC connector for SPM is closest to the front panel, the connector for
VIB closest to the rear side of the housing.
Recommended vibration transducers are SPM type SLD or IEPE (ICP®) type transducers with bias
6 to 14 VDC and sensitivity 0.9 to 12.0 mV/m/s2. Vibration transducers of type SLD are isolated
from machine ground. The cable shield shall be connected in one end only, preferably to the earth
terminal. The cable shield shall not be connected to the earth terminal in cases where the shield
already is connected at the transducer end. The cable inlets (M12) are intended for measuring
cables with diameter 5 mm (IP65).
Relays
The relay specifications are 250 Vac / 5 A /1250 VA for the main relay (Relay 1, connectors 4-5).
The four secondary relays are specified 125 Vac / 1 A / 60 VA (150 Vdc / 1 A / 30 W). As default,
the relays are NC = normally closed and open on alarm or power failure. You can change that to
NO = normally open when programming the unit, see page 11.
Analog outputs
The four analog outputs (fig.2) have no galvanic separation, but a common earth connection. In
case galvanic separation is required, the user must supply a suitable insulation module.
Check supply current
type and voltage
Note relay channel
numbering
Note analog channel
numbering
Use correct transducer
connector
Default: NC
Fuse
Please note:
Regarding the outputs: analog output channels and relays can be linked to any of the input chan-
nels by programming the MG4-REF11A, see page 14.
When TLT is set to ON (page 11), the MG4-REF11A indicates TLT fault (fault on transducer line
test) when the transducer is not connected or when the transducer line is not OK (open or short
circuit for VIB, TLT value below 15 for SPM). This will cause the connected analog output to go to
approx. 0 mA. Setting TLT to OFF prevents the analog output from dropping below 4 mA.
12
+(A) –(B)
Twisted pair cable to
vibration transducer
Ground
shield
Analog outputs
Ch. 4 Ch. 3 Ch. 2 Ch. 1
A
4-20mA
Max. loop
resistance 400 Ω
Vibration input
Channel 1

8 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Power supply
Shielded cable, twisted pairs
Shield not
connected
Shield connected to ground
Connecting
terminals for
AI = analog input
(4 - 20 mA) and
DI = digital input
(relays),
and power
Connection to PLC via analog output
To connect an MG4-REF11A unit to a PLC, one uses a shielded cable with twisted conductor pairs.
The analog 4-20 mA outputs of the MG4-REF11A are connected to an AI unit (analog input), the
relays to a DI (digital input) unit.
The condition monitoring parameters are set up in the MG4-REF11A. Control, display and data
storage are handled by the PLC.
PLC = Programmable Logic Control
CPU = Central Processing Unit
AI = Analog Input 4-20 mA from the MG4-REF11A
AO = Analog Output 4-20 mA to an external display
DI = Digital Input 0 or 24 V from a relay in the MG4-REF11A
DO = Digital Output 0 or 24 V to an external relay
DCS = Distributed Control System
Power supply
DCS

Machine Guard MG4-REF11A 9
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Programmed measuring parameters
The measuring and alarm parameters of an MG4-REF11A are programmed, using the keys on the
front panel. The program is password protected, which means that a the password ‘SPM’ has to
be input before any parameter can be changed.
Programmed parameters are:
• Measuring time 1 to 15 seconds (VIB only)
• Two alarm limits per channel
• Alarm delay 0 to 600 seconds
• Link between the measuring channel and analog output channels
• Working point can be set 20 to 60%
• Link between an alarm limit and one of the relays. Several different alarms
can be linked with the same relay.
The length measuring unit can be set to either mm or inch under SETUP on the VERSION menu.
There you can also set TLT to OFF. TLT is the transducer line test. For the VIB channel, this test
checks for interruption or short circuit in the cable between vibration transducer and MG4-REF11A,
or in the transducer itself.
For the SPM channel, the test checks the characteristics of the whole measuring circuit and returns
a TLT number which should be larger or equal to 15. On TLT fault, the analog output normally
goes to approx. 0 mA. Setting TLT to OFF prevents the analog output from dropping below 4 mA.
Yellow system alarm will not be shown, but the relay, if linked, will still react to the system alarm.
Programmed measuring parameters:
• Measuring time (VIB only)
• Two alarm limits per channel, max and min
• Alarm delay 0 to 600 seconds
• Measuring channel’s link to analog output
• Working point 20 to 60%
• Alarm limit, link to relay
Select channel
Start programming
Save and exit
Set parameters
REF11A
VIB 1.5 mm/s
SPM 40 %

10 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Reset to default values:
• Hold down the invisible RESET button and press SET
to restore default parameters
Invisible RESET
button
REF11A
VIB 1.5 mm/s
SPM 40 %
Reset default parameters
An unmarked button is located in the space below the RIGHT and to the right of the DOWN but-
ton. Pressing SET while holding down this invisible RESET button restores the default parameters.
The message ”Def. init.” (default initiation) is displayed while the reset takes place. These are the
default settings:
SPM channel:
Working point: ............... 30%
TLT Alarm: ...................... relay 5
A1 (max): ....................... 70%, relay 1
A2 (min): ........................ 10%, relay 2
Analogue out:................. 1 [ % ]
Analogue out: ................ 2 [ dBsv ] absolute
value of dBc
Analogue out: ................ 3 [ dBsv ] absolute
value of dBm
4 mA: .............................. 0 [dBsv]
Alarm delay:.................... – – –
General:
Password......................... ON
Measuring....................... ON
TLT .................................. ON
Relays ............................. NC
VIB channel:
Measuring time............... 1sec
Machine class.................. 3
TLT Alarm ....................... relay 5
A1 (max): ...................... 11.3 [mm/s], relay 3
A2 (min): ......................... 0.5 [mm/s], relay 4
Analogue out:................. 4 [mm/s]
20mA: ............................. 50.0 [mm/s]
Alarm delay:.................... – – –

Machine Guard MG4-REF11A 11
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
The VERSION menu, version and setup
The VERSION menu shows the basic setup of the MG4-REF11A unit, which is permanently pro-
grammed and cannot be changed, and also a number of general settings which can be changed
with the function keys on the front panel.
To reach the menu (A), press the RIGHT key. With SET you move the cursor to one of the four
headers. Press ENT to open the first one, VERSION (B). This shows the MG4-REF11A version, the
vibration measuring ra nge and the shock pulse transducer type. On line 4 you see the version
numbers of the three processors CPU, VIB, and SPM. None of these settings can be changed. Press
ENT to exit to the VERSION menu.
The menu under SETUP (C) allows you to make changes. Use SET to go to the setting to be changed.
The UP or the DOWN key toggles between the length measuring units mm and inch. This setting
affect the vibration velocity reading (mm/s or inch/s). Set or measured values are automatically
recalculated when the unit is changed.
Contrast means display contrast, changed with UP and DOWN. You can see the change when
repeatedly pressing one of these keys.
The TLT function is toggled ON/OFF with the UP or DOWN key. TLT = OFF means that a transducer
line fault will not let the output analog current drop below 4 mA. The yellow status light will not
be shown, but if a relay is linked to the TLT fault, it will be triggered. You can check the nature of
the TLT fault by selecting the channel with SET and pressing ENT. The TLT status is shown on the
first menu.
Relay NC (normally closed) can be toggled to Relay NO (normally open). This setting affects all
relays.
Press RIGHT for
VERSION menu
Press SET for
menu selection,
ENT to open sub menu
Press UP / DOWN to change value,
SET for menu selection, ENT to exit
Press ENT to exit
Version: Setup:
Unit mm
Contrast
TLT On
Relay NC
Version
Setup
Password On
Measuring On
REF11A
10-1000 Hz 42000
Ver
3.00 3.00 2.00
A
BC

12 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
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On the VERSION menu,
press SET to select Password,
press UP for OFF
Press UP to change letter,
RIGHT for next position,
ENT to exit
Password:
Version
Setup
Password On
Measuring On
Password
SPM
On the VERSION menu,
press SET to select Measuring,
press UP for OFF
Version
Setup
Password On
Measuring Off
Normal measuring mode:
MG4-REF11A
VIB 1.5 mm/s
SPM 40 %
Automatic exit to
measuring mode
The VERSION menu, password and stand-by
The measuring channel configuration is protected by the password ‘SPM’. While Password = ON
is shown on the VERSION menu (A), you can enter the channel programming mode and check all
settings, but you cannot make any changes (the UP/DOWN keys are locked). On the VERSION
menu, you can select PASSWORD with SET, then change to OFF with UP or DOWN. This will open
the password menu (B), with the cursor on the first of three positions marked * * *. Press and hold
down UP until the first position reads the required letter. Step to the next position with RIGHT,
use UP to set the next letter and step to the next position with RIGHT and set the last letter. You
can also use the DOWN key to change letters, and go to the previous position with LEFT. With
ENT you exit to the VERSION menu. If you have set the password, it will now be OFF, else it is
still ON and you cannot program channels. Please note: Reset the password to ON once you have
finished programming.
Measuring = OFF means that the analog and relay outputs are frozen (stand-by mode). This set-
ting is selected before disconnecting any of the VIB or SPM input channels, else disconnecting a
transducer will cause a system fault alarm.
When no keys are pressed, the unit will automatically return from the VERSION menu to the normal
measuring result display (C) after 30 seconds. You can also exit with LEFT or RIGHT. Please note
that selecting the VERSION menu or the programming mode has the same ”freezing” effect as
setting the measuring mode to off, and that normal operation is resumed as soon as you return,
intentionally or automatically, to the measuring result display.
A
BC

Machine Guard MG4-REF11A 13
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Programming a vibration channel
To enter the programming mode for a channel, select the channel with the SET key (moves the
cursor at the beginning of line 1 to the next line), then press ENT. You get a sequence of program-
ming menus.
The cursor will jump to the next position which can be changed whenever you press the SET key. In
each programmable position, the keys UP and DOWN will alter the value. When a programmable
parameter consists of several positions, e.g. a three digit number, you go to the next position with
RIGHT, or to the previous position with LEFT.
The first line contains the channel name. This can be changed, one position at a time. The new
channel name is also shown on the following programming menus.
TLT (line 2 on menu A) means transducer line test and shows the transducer line quality. For a VIB
channel it can be OK (no fault), H = high (interrupted circuit) or L = low (short circuit).
Line 3 on menu (A) contains a parameter, the ISO machine class number. Setting one of the num-
bers 1 to 6 will automatically set the limit for “unacceptable” vibration as alarm level A1 (max) (red
alarm). The alarm level A2 (min) is the minimum alarm (red alarm). Alarm will be triggered when
the level is above A1 (max) and below level A2 (min). The setting “ – “ means no machine class
and requires a manual entry of the alarm limits on a later menu. Changing the alarm limits on that
menu removes the machine class information on menu (A).
On menu (B) select the transducer sensitivity value (0.9–12.0 mV/m/s2). Enter the value from the
transducer’s calibration/data card.
Press SET to
select the channel
Channel name,
TLT status display,
ISO machine class
Transducer sensitivity
VIB channel
TLT H (L OK)
Class 3
UP
RIGHT
DOWN
Press ENT to enter and exit
the programming mode
B
A
VIB channel
Transducer
sensitivity
3.71 mV/m/s2

14 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Link to relay, alarm:
VIB channel
Measuring
time 1 s
VIB channel
TLTA Relay 5
A1 11.3 Relay 3
A2 0.5 Relay 4
VIB channel
Analog out 4
20mA = 50.0 mm/s
Alarm delay:
VIB channel
Alarm
delay – – – s
Press ENT to exit to
the measuring mode
C
DF
Programming a vibration channel
The default setting for the vibration measuring time (C) is 1 second. The time can be set to max.
15 seconds.
On the menu (D) you see the alarm limit A1 (max) corresponding to the selected ISO machine class
number. Changing the alarm limits menu removes the machine class information (see previous
page, A). The alarm level A2 (min) is default 0.5 mm/s.
System alarm (TLTA) and the two alarm limits A1 and A2 can be linked to any of the available relays
by setting the relay number 1 to max. 5. Each relay can be linked to more than one alarm cause.
The setting ” - ” means no link to a relay.
On the menu (E) you set the link to an analog output channel for the 4 - 20 mA signal by setting a
channel number from 1 to max. 4. The analog line can not, of course, be linked to more than one
measuring channel. When stepping with UP or DOWN, only free channel numbers are displayed.
On this menu, you also set the measuring range to max. 10, 20, 30, 40, or 50 mm/s RMS. The
analog current will be scaled accordingly, max. vibration value = 20 mA out.
Alarm delay is set in steps of 2 seconds by stepping to a number above 0 on menu (F). The maxi-
mum is 600 seconds or 10 minutes.
E
Measuring time: Output channel, range:

Machine Guard MG4-REF11A 15
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Programming a SPM channel
Select the SPM channel with the SET key and press ENT to get the sequence of programming menus.
”TLT” on line 2 of menu (A) shows the transducer line status. For an SPM channel it is a number
expressing the quality of the measuring circuit. Normal values are around 20, the lowest acceptable
value is 15 (recommended). Values below 15 invalidates the measuring results because the input
signal quality is poor. RETURN takes you back to the main menu. Press ENT.
Move the cursor with SET to mark SETUP (A). Press ENT (password should be open). In menu B the
first line contains the channel name, which can be changed. W-POINT is the working point and can
be set 20 to 60 % (default 30%). The correct gain will be set automatically from this preset value
(the MG4-REF11A unit automatically adjusts the gain).
On the menu (C) you can change the value for TLTA ( = transducer line alarm) and the two standard
alarm limits A1 (70%) and A2 (10%). Both limits are relative values based on dBc values. A1 and A2
will trigger the relays and change the evaluation in green/red, indicated by the status LED display.
System alarm (TLTA) and the two alarm limits A1 and A2 can be linked to any of the available relays
by setting the relay number 1 to max. 5. A relay can be linked to more than one alarm cause. The
setting ” – ” means no link to a relay.
On the menu (D) you set the link to an analog output channel for the 4 - 20 mA signal by setting a
channel number from 1 to max. 4. SPM monitoring returns three values, % (relative value based on
dBc), maximum value dBm (dBsv) and carpet value dBc (dBsv). The analog line can not, of course,
be linked to more than one measuring channel. Only free channel numbers are displayed.
On the menu (E) you set the dBsv value corresponding to 4 mA (100 dBsv is always 20 mA out).
The analog current will be scaled accordingly to the setting.
Alarm delay is set in steps of 2 seconds by stepping to a number above 0 on menu (E). The maxi-
mum is 600 seconds or 10 minutes.
Set W-point:
SPM channel
TLT 18 return
Adjust
Setup
SPM channel
W-point 40 %
SPM channel
Analog out 1 %
Analog out 2 dBc
Analog out 3 dBm
dBsv and alarm delay:
SPM channel
4 mA = 0 dBsv
Alarm
delay – – – s
Press ENT to exit to
the measuring mode
A
B
E
D
Select setup: Analog output channel:
Alarms, links to relays:
SPM channel
TLTA 15 Relay 5
A1 % 70 Relay 1
A2 % 10 Relay 2
C

16 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Automatic adjusting of gain
During normal operation, after changing disc segments, the gain should be adjusted. This will set
the correct measuring range adjusted to the shock level of the machine and the W-point.
Select the SPM channel with the SET key, press ENT to get the programming menus. Move the
cursor with SET to select ADJUST in the menu (A). Press ENT.
Move the cursor to YES with SET (B) and press ENT.
The automatic adjusting of gain is activated (C). When the gain is adjusted the display goes back
to the measuring mode.
The SPM values are relative changes in the strength of the shock pulses generated in a machine
during various stages of its operation. Variations between machines are without significance for
the functioning of the monitor, provided that the measuring range (gain) of each instrument is
properly adjusted to the shock level of the machine. The measuring unit for shock pulses is dBsv.
The normal measuring range is 20 dBsv (10 - 100%). By adjusting the gain the measuring range is
automatically shifted upwards or downwards.
Adjust gain:
SPM channel
Adjust gain
No
Yes
A
B
Select adjust:
SPM channel
Adjusting gain C
Automatic adjusting of gain:
SPM channel
TLT 18 return
Adjust
Setup
Gain adjustment

Machine Guard MG4-REF11A 17
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
Delay time
=10 s
Alarm delay reset
Alarm level
Alarm
activated
The effect of alarm delay
Alarm delay is set in steps of 2 seconds, to max. 600 seconds = 10 minutes. During the delay time,
the measured value has to be constantly above the alarm level, else the delay is interrupted and
measurement continued without triggering a relay or changing the status light. First after a full
delay period the relay is triggered.
Alarm is reset automatically when the alarm condition (high measured value) is terminated. There
is no manual reset.

18 Machine Guard MG4-REF11A
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden Technical data are subject to change without notice.
Tel [phone] • Fax [phone] • [email protected] • www.spminstrument.com ISO 9001:2000 certified © SPM 2017-09. 71947 B
TRV-18/19
TRV-20/21
Insulation foot
TRX-18/19
Max. 50 m cable
Vibration transducers
The transducers SLD121/TRV-18/19 (linear frequency range up to 1000 Hz), SLD122/TRV-20/21
(linear frequency range up to 5000 Hz) and SLD144 (linear frequency range up to 10000 Hz) are
piezoelectric accelerometers of compression type. They have built-in pre-amplifiers and are power
supplied (24 Vdc) from the MG4. This allows the detection of a short or open circuit in the trans-
ducer line. The cable length between transducer and measuring unit is max. 50 m (165 ft.).
The nominal transducer output for SLD121/TRV-18/19 is 1.2 mV per m/s2. SLD122/TRV-20/21
has 4.0 mV per m/s2and SLD144 has 10 mV/m/s2. The actual transducer output is printed on the
transducer’s calibration card. This value is input as part of the measuring channel configuration.
The transducer is mounted against a smooth, flat surface on the machine. Transducers of type SLD
have thread size M8 or UNF1/4”. They have SMB connector for coaxial cable or 2 pin connector
for twisted pair cable.
TRV-18 and TRV-20 have thread size M8, while TRV-19 and TRV-21 have thread size UNF 1/4”-28.
Transducers of type TRV are delivered with three washers for adjusting the connector angle. Each
washer turns the transducer 90°. The coaxial cable (SPM 90005-L or 90267-L) with TNC connector
must be secured with a clamp close to the transducer. In moist environments, use sealing TNC cable
connectors (SPM 13008, 15291 or 15837) to prevent cable corrosion. As a rule, an insulation foot,
either TRX-18 for M8 or TRX-19 for UNF 1/4”-28, should be used to provide electric insulation.
The reason is that differences in earth potential between transducer and MG4 can cause measuring
faults. Note, however, that the installation foot limits the linear range of the transducer to ≈ 2000 Hz.
Transducers of type SLD has temperature range –40° to +125° C (–40° to +260°F). TRV-18/19/20/21
has temperature range –20 to +125 °C (4 to +260 °F). The coaxial cable SPM 90005-L is specified
–25 to +70 °C (–13 to +158 °F). The measuring cable SPM 90267-L is specified –55 to +150 °C
(–67 to +302 °F).
SLD121
SLD122
SLD144