Page 1
Motion Sensors
Milltronics MFA 4p
Operating Instructions
Edition
08/2017
Page 2
Page 3
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Milltronics
Motion Sensor s
Milltronics MFA 4p
Operating Instructions
08/2017
A5E33988839_AB
Introduction
1
Milltronics MFA 4p Overview
2
Installing/mounting
3
Connecting
4
Service and maintenance
5
Troubleshooting
6
Technical data
7
Dimension drawings
8
Technical Reference
A
Applications
B
Support
C
Page 4
Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E33988839
Ⓟ
Copyright © Siemens AG 2017.
All rights reserved
Legal information
Warning notice system
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
Qualified Per sonnel
personnel qualified
Proper use of Siemens products
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
Disclaimer of Liability
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
The product/system described in this documentation may be operated only by
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Note the following:
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
for the specific
08/2017 Subject to change
Page 5
Table of contents
1 Introduction ............................................................................................................................................. 5
2 Milltronics MFA 4p Overv iew ................................................................................................................... 7
3 Installing/mounting .................................................................................................................................. 9
4 Connecting ........................................................................................................................................... 13
5 Service and maintenance ...................................................................................................................... 21
6 Troubleshooting .................................................................................................................................... 25
7 Technical data ...................................................................................................................................... 27
1.1 Transportation and Storage ...................................................................................................... 5
1.2 Unit Repair and Excluded Liabil ity ............................................................................................ 5
3.1 Location Requirements ............................................................................................................. 9
3.2 Proper Mounting ....................................................................................................................... 9
3.3 Mounting Details ..................................................................................................................... 10
3.4 Wiring ...................................................................................................................................... 11
4.1 MFA 4p Circuit Board Layout .................................................................................................. 13
4.2 Interconnection ....................................................................................................................... 14
4.2.1 MSP-3 or MSP-9 Probe with RMA (remote mounted amplifier) ............................................. 14
4.2.2 MSP-12 Probe with IMA (internally mounted pre-amplifier) ................................................... 15
4.2.3 XPP-5 with IMA (internally mounted pr e-amplifier) ................................................................. 16
4.2.4 Cable length from RMA or IMA to MFA 4p ............................................................................. 16
4.2.5 Interconnection Diagram for XPP-5 ........................................................................................ 17
4.3 Connection to Power............................................................................................................... 18
4.4 MFA 4p Wiring for Automatic Start Delay ............................................................................... 19
5.1 Calibration ............................................................................................................................... 21
5.2 Signal Generator Interface ...................................................................................................... 23
5.3 Cleaning .................................................................................................................................. 24
5.4 Maintenance ........................................................................................................................... 24
6.1 Troubleshooting ...................................................................................................................... 25
7.1 Power ...................................................................................................................................... 27
7.2 Performance ........................................................................................................................... 27
7.3 Outputs ................................................................................................................................... 28
7.4 Construction ............................................................................................................................ 28
7.5 Approvals ................................................................................................................................ 28
7.6 Operating Conditions .............................................................................................................. 29
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
3
Page 6
Table of contents
8 Dimension drawings .............................................................................................................................. 31
A Technical Reference ............................................................................................................................. 39
B Applications .......................................................................................................................................... 43
C Support ................................................................................................................................................. 51
Index .................................................................................................................................................... 53
8.1 MFA 4p ................................................................................................................................... 31
8.1.1 Type 4X/NEMA 4X/IP65 Polycarbonate Enclos ur e ............................................................... 31
8.1.2 Type 4/NEMA 4/IP65 Painted Steel Enclosure & Type 4X/NEMA 4X/IP65 Stainless
Steel Enclosure ...................................................................................................................... 32
8.2 Probes .................................................................................................................................... 33
8.2.1 High Temperature Probe MSP-3 ........................................................................................... 33
8.2.2 Stainless Steel Probe MSP-9 ................................................................................................. 34
8.2.3 Standard Probe MSP-12 ........................................................................................................ 35
8.2.4 Hazardous Locations XPP-5 .................................................................................................. 36
A.1 Principles of Operation ........................................................................................................... 39
B.1 Bucket Elevators .................................................................................................................... 43
B.2 Bucket Elevator ...................................................................................................................... 45
B.3 Shafts ..................................................................................................................................... 46
B.4 Rotating Shaft of Rotary Feeder ............................................................................................ 47
B.5 Drive Sprocket on Rotary Feeder .......................................................................................... 47
B.6 Belt Conveyors ....................................................................................................................... 48
B.7 Screw Conveyors ................................................................................................................... 48
B.8 Screw Conveyor Flights ......................................................................................................... 49
B.9 End Bearing on Screw Conveyor ........................................................................................... 49
B.10 Non-ferrous Window .............................................................................................................. 50
C.1 Certificates ............................................................................................................................. 51
Milltronics MFA 4p
4 Operating Instructions, 08/2017, A5E33988839_AB
Page 7
1
Note
The MFA 4p (Motion Failure Alarm)
otherwise protection provided by the equipment may be impaired.
1.1
Transportation and Storage
WARNING
1.2
Unit Repair and Excluded Liability
This instruction manual covers the installation, operation, and maintenance of the Milltronics
MFA 4p.
This instruction manual covers the installation, operation and maintenance of the Milltronics
MFA 4p. It is essential that this manual be referred to for proper installation and operation of
your unit. Adhering to the installation and operating procedures will insure a quick, trouble
free installation and allow for the maximum accuracy and reliability of your motion sensing
alarm unit and probes.
is to be used only in the manner outlined in this manual,
Cardboard shipping package provides limited humidity and moisture protection. This
product can only function properly and safely if it is correctly transported, stored, installed,
set up, operated, and maintained.
● The user is responsible for all changes and repairs made to the device by the user or the
user’s agent.
● All new components are to be provided by Siemens Milltronics Process Instruments.
● Restrict repair to faulty components only.
● Do not reuse faulty components.
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
5
Page 8
Introduction
Note
This product is intended for use in industrial areas.
In a domestic environment this device may cause radio interference.
1.2 Unit Repair and Excluded Liability
Milltronics MFA 4p
6 Operating Instructions, 08/2017, A5E33988839_AB
Page 9
2
Milltronics MFA 4p is a highly sensitive, single setpoint motion sensor alarm unit, used with
MSP and XPP probes. The probe detects an increase or decrease in the speed of rotating,
reciprocating, or conveying equipment and sends the information to the MFA 4p. The MFA
4p works with a pre-amplifier which can be internal to the motion sensing probe or remote
from the motion sensing probe.
Pulses generated from the probe are continually compared to the adjustable setpoint. If the
pulse rate is lower than the setpoint, the alarm relays operating in a faiI-safe mode will deenergize, indicating failure. The relays will not energize until the pulse rate increases above
the setpoint.
Milltronics MFA 4p
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7
Page 10
Milltronics MFA 4p Overview
Milltronics MFA 4p
8 Operating Instructions, 08/2017, A5E33988839_AB
Page 11
3
Note
Installation shall only be performed by qualified personnel and in accordance with local
governing regulations.
3.1
Location Requirements
Note
Do not mount
3.2
Proper Mounting
Functionality loss indicators:
The MFA 4p (and RMA if applicable) must be mounted in a non-hazardous area that is
clean, dry, vibration-free, within the ambient temperature range, and non-corrosive to the
electronics or its enclosure. The door should be accessible for viewing and to allow
calibration of the MFA 4p.
Consider the probe location carefully before installation. Avoid strong magnetic fields
(50/60 Hz) from nearby power transformers, heater elements, or large industrial motors,
because these can affect the probe’s performance.
MFA 4p in direct sunlight.
The probe should be mounted onto a vibration free structure using the mounting flange. The
gap between probe and target should be large enough to prevent the target from damaging
the probe. The probe environment must be within the probe's ambient temperature range
and non-corrosive to the probe's body. Refer to Applications (Page 43).
The probe design detects a changing magnetic field, typically caused by a ferromagnetic
target disturbing the probe's magnetic field. Extremely strong magnetic fields (like those
produced by the 30 A/m requirements of 1EC 60004-8, Power Frequency Magnetic Field
Immunity test) will be detected and will result in loss of functionality.
● Alarm conditions by relay trip
● False pulse readings in LED1
Milltronics MFA 4p
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Page 12
Installing/mounting
3.3
Mounting Details
MSP-9 Mounting Details
3.3 Mounting Details
Dimensions in mm (inch)
① 6 (0.25) ∅ 4 holes equally spaced on a 114 (4.5) BCD
② 95 (3.75) ∅ probe clearance hole
③ Panel cutout
④ Probe flange
● For high temperature and corrosion resistance applications
● 304 stainless steel body comes with stainless steel clamp and silicone gasket
● 1.5 m (5 ft) Belden 83321 Teflon
● Pre-amp is mounted in an enamel painted steel Hammond 1414N4E enclosure
1)
Teflon is a registered trademark of E.I. du Pont de Nemours and Company
1)
cable potted in probe
Milltronics MFA 4p
10 Operating Instructions, 08/2017, A5E33988839_AB
Page 13
Installing/mounting
MSP-3, MSP-12, XPP-5 Mounting Details
3.4
Wiring
3.4 Wiring
Dimensions in mm (inch)
① 95 (3.75) ∅ probe clearance hole
② 6 (0.25) ∅ hole for ¼ - 20 nut and bolt or drill and tap, four holes on 114 (4.5) BCD
③ 6 (0.25) ∅ hole for ¼ - 20 bolt on 114 (4.5) BCD, four places
④ 113 (5.25) O.D.
⑤ 2" NSPL
Where possible, the probe components should be interconnected via flexible conduit. This
allows for easier removal or adjustment of the probe and mounting flange assembly.
Milltronics MFA 4p
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Page 14
Installing/mounting
3.4 Wiring
Milltronics MFA 4p
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Page 15
4
4.1
MFA 4p Circuit Board Layout
Milltronics MFA 4p
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13
Page 16
Connecting
4.2
Interconnection
Note
Use shielded cable and connect all cable shields to the
differential ground loops.
4.2.1
MSP-3 or MSP-9 Probe with RMA (remote mounted amplifier)
4.2 Interconnection
MFA shield terminals to avoid
Maximum cable length from probe to RMA is 30 m/100 ft of shielded cable, 18 ga. wire.
See Cable length from RMA or IMA to MFA 4p (Page 16) for cable lengths from RMA to
main group.
Milltronics MFA 4p
14 Operating Instructions, 08/2017, A5E33988839_AB
Page 17
Connecting
4.2.2
MSP-12 Probe with IMA (internally mounted pre-amplifier)
4.2 Interconnection
Wire can be run in conduit common to motor supply or control wiring. Connection to probe
terminals can be made under probe cap.
See Cable length from RMA or IMA to MFA 4p (Page 16) for cable lengths from probe at
MFA 4p.
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
15
Page 18
Connecting
4.2.3
XPP-5 with IMA (internally mounted pre-amplifier)
Note
Refer to
4.2.4
Cable length from RMA or IMA to MFA 4p
Wire gauge
Length in feet
Length in meters
22 AWG (0.34 mm2)
2 500
760
18 AWG (0.75 mm2)
5 000
1 520
12 AWG (4 mm2)
25 000
7 600
4.2 Interconnection
XPP-5 cable must be run in dedicated, approved metal conduit, boxes and fittings and to
procedures in accordance with all governing regulations. See Cable length from RMA or IMA
to MFA 4p (Page 16) for cable lengths from probe at MFA 4p.
Interconnection Diagram for XPP-5 (Page 17)
Milltronics MFA 4p
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Page 19
Connecting
4.2.5
Interconnection Diagram for XPP-5
4.2 Interconnection
Milltronics MFA 4p
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17
Page 20
Connecting
4.3
Connection to Power
4.3 Connection to Power
● Terminal 10 must be connected to reliable ground.
● All current-carrying conductors must be protected by a fuse or circuit breaker in the
building installation, having a breaking capacity of up to 15 A.
● A circuit breaker or switch in the building installation, marked as the disconnect switch,
must be in close proximity to the equipment and within easy reach of the operator, and
must disconnect all current-carrying conductors.
● AC input circuit, relay circuits, min. 14 AWG copper wire.
● Recommended torque on terminal clamping screws, 7 inch/ lb max.
● All field wiring shall have insulation suitable for the highest applied input or relay voltage
(whichever is greater).
● Relay contact terminals are for use with equipment that has no accessible live parts and
wiring that has insulation suitable for at least 250 V. The maximum allowable working
voltage between adjacent relay contacts shall be 250 V.
Milltronics MFA 4p
18 Operating Instructions, 08/2017, A5E33988839_AB
Page 21
Connecting
4.4
MFA 4p Wiring for Automatic Start Delay
Note
1.
2.
START
3.
Time Delay
4.4 MFA 4p Wiring for Automatic Start Delay
Interlocks and Safety Pull Switches are not shown.
If
allow MFA 4p contact to latch. In this case, program a timer contact into the circuit.
CSA requires an 8 A or less fuse to protect contacts. For 240 V AC, protect the contacts
with a 1 500 VA transformer as well.
Should the
continuously from a separate source and the potentiometer turned to zero. This is usually
necessary for automatic up-stream startup of conveying devices after the down-stream drive
has reached its operation speed.
is initiated by programmable logic controller, closure time may be too brief to
feature on start-up not be required, power should be applied
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
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Page 22
Connecting
4.4 MFA 4p Wiring for Automatic Start Delay
Milltronics MFA 4p
20 Operating Instructions, 08/2017, A5E33988839_AB
Page 23
5
5.1
Calibration
Note
To help the calibration procedure, short N.O. contacts of relays to prevent motor shutdown
(terminals 1
setpoint is established.
MFA 4p
Start Delay
CCW
Underspeed
SW3
Underspeed
pulses per minute (ppm)
SW2
X 100
ppm
(CW) to 30
ppm
CCW
ppm
2 ppm
ppm
CW
SW2
X 10
X 1
CCW
SW2
0
Start Delay
The probe and pre-amplifier require no calibration.
Connect the probe, pre-amp, and MFA 4p as shown in the Interconnection (Page 14)
chapter. Connect the MFA 4p to power as shown in the Connection to Power (Page 18)
diagram, and if applicable, as shown for MFA 4p Wiring for Automatic Start Delay (Page 19).
to 2 and/or 4 to 5). This allows the system to run uninterrupted until an operating
Refer to MFA 4p Circuit Board Layout (Page 13)
1. Operate monitored equipment at its normal operating speed.
2. Confirm that Probe LED 1 is pulsing at a regular frequency.
3. Set
1. Set switch
2. Set
3. Turn
4. Determine incoming pulse rate by slowly turning
5. If no response is obtained when you set the
6. When Relay LED 2 goes on, indicating the incoming pulse rate, turn potentiometer
2 goes on. As the MFA 4p requires 2 pulses within range before energizing relays, low
applications (e.g.
intervals.
suffers), reset potentiometer fully
and repeat step 4.
slightly past this point to obtain an operating setpoint that allows for normal fluctuations
due to load and voltage variations. For 50 % of full speed, set potentiometer (and
required) to halfway between incoming pulse rate of normal speed and
fully counter-clockwise (
to
potentiometer fully clockwise
.
switch
) may require stepping of potentiometer at appropriate time
, set switch
) to 0 seconds.
to
potentiometer to 3 (below this stability
position.
.
potentiometer
to
and then
until relay LED
if required,
ppm.
if
7. Set
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
normal operating speed before LED 2 can turn off.
by adjusting potentiometer so that equipment being monitored can attain
21
Page 24
Service and maintenance
Overspeed
SW3
Overspeed
ppm
SW2
X 1
ppm
CCW
ppm
ppm
2 ppm
ppm
CCW
SW2
X 10
X 1
Note
If N.O. contacts were shorted as described in final note of calibration preamble, remove them
now as calibration is complete.
5.1 Calibration
1. Set switch
2. Set
3. Set
4. Determine incoming pulse rate by slowly turning
to
switch
to
potentiometer fully
.
position.
to 0.
potentiometer CW until Relay LED
2 goes on. Because the MFA 4p requires 2 pulses within range before energizing relays,
low
applications (e.g.
) may require stepping of potentiometer at appropriate
time intervals.
5. If no response is obtained when you set the
suffers), reset potentiometer fully
potentiometer to 3, (below this stability
and set switch
to
, and then
if
required, and repeat step 4.
6. When Relay LED 2 goes on, indicating the incoming pulse rate, turn potentiometer CW
slightly past this point to obtain an operating setpoint that allows for normal fluctuations
due to load and voltage variations.
Milltronics MFA 4p
22 Operating Instructions, 08/2017, A5E33988839_AB
Page 25
Service and maintenance
5.2
Signal Generator Interface
5.2 Signal Generator Interface
① Signal generator
② 6 V p-p sine
③ 6 V p-p square
④ 3 V p square
Milltronics MFA 4p
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23
Page 26
Service and maintenance
5.3
Cleaning
5.4
Maintenance
5.3 Cleaning
If it is necessary to clean the enclosure and circuit boards:
1. First, make sure the power is disconnected at the main breaker.
2. Use a vacuum cleaner and a clean, dry paint brush.
3. Check all electrical contacts for corrosion and arcing.
It is a good idea to periodically check the face of the probe: it should be free of material
buildup, corrosion or deformation.
The Motion Failure Alarm MFA 4p requires no maintenance: however, we recommend a
program of periodic checks.
Milltronics MFA 4p
24 Operating Instructions, 08/2017, A5E33988839_AB
Page 27
6
6.1
Troubleshooting
LED 1
LED 2
Term 7/8
(note 1)
C8
Term 1/2
relay 1 out
Term 4/5
relay 2 out
Alarm
pulsing
off
24 V
27 V
open
open
open circuit
short circuit
Relay defective
pulsing
on
24 V
27 V
open
open
Normal pulsing on 24 V 27 V closed closed
Probe reversed
polarity
Probe wiring
Probe wiring
on off 20 V 27 V open open
off off 27 V 27 V open open
off off 0 V 27 V open open
Milltronics MFA 4p
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25
Page 28
Troubleshooting
Notes:
SW2
X 1
MSP-3 and MSP-9
750 ohms
6.1 Troubleshooting
● Voltage levels are DC, nominal values, and may appear to be pulsing, coincidental with
LED 1.
● If diagnosis does not solve the malfunction, the probe, pre-amp or MFA 4p may be
defective.
● If no spare circuit boards or probes are available for interchanging, the MFA 4p may be
tested as follows in order to determine which section is defective:
– To find out if the MFA 4p is defective:
i. Disconnect the pre-amp.
ii. Set ppm switch
to
position and turn potentiometer to 15.
iii. Connect one Iead of a 530 ohm, 1 watt resistor to terminal 7 and then momentarily
contact terminal 8 at a rate of once per second. If the MFA 4p is functional, the relays
will energize after two puIses and de-energize approximately 8 seconds after last
pulse.
– To find out if the RMA is defective:
i. Disconnect pre-amp from the MFA 4p. Attach probe across terminals TB1 1/2 and a
24 V DC (floating) power supply across terminals TB2 3/2, according to the MSP-3 or
MSP-9 Probe with RMA (remote mounted amplifier) (Page 14) connection diagram.
ii. Run equipment to be monitored at normal operating speed or pass a ferrous object
in front of and as close to probe as possible at a continuous rate.
iii. With an oscilloscope, look for approximately 6 V peak to peak pulses or alternating
hi/lo levels across ground and link 3. Or with an amp meter connected in series
between the RMA and the 24 V DC power supply, Iook for hi/lo levels of approximately
12 mA/40 mA alternating at the rate of the passing ferrous objects.
– To find out if the probe is defective (non-IMA type only; i.e. MSP-3 and MSP-9):
i. Disconnect probe from pre-amp.
ii. Connect an ohm meter across the black and white leads.
Milltronics MFA 4p
26 Operating Instructions, 08/2017, A5E33988839_AB
iii. Nominal probe impedances are as follows:
If impedance deviates substantially from these values, an open or short circuit
condition is indicated.
Page 29
7
Note
Always use product in accordance with specifications.
7.1
Power
7.2
Performance
Repeatability
Temperature coefficient (setpoint variance)
Setpoint adjustment range
Dynamic range
● 100 ... 240 V AC ± 10 %, 50/60 Hz, 15 VA
Fuse: 5 x 20 mm, Slow Blow, 1A, 250 V
● ± 1 %
● 0.018 %/°C (0.01 %/°F)
● 2 ... 3 000 ppm (pulses per minute): standard model
● 0.15 ... 15 ppm: slow speed version
● 0 ... 7 200 ppm
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
27
Page 30
Technical data
7.3
Outputs
Resistive rating
7.4
Construction
Weight
7.5
Approvals
7.3 Outputs
● 2 relays with Form C (S.P.D.T.) fail-safe contacts (relays operate in unison)
● 8 A @ 250 V AC
● Polycarbonate enclosure: 1.5 kg (3.3 lb)
● Mild steel or stainless steel enclosure: 4.3 kg (9.5 lb)
● CE, CSA
● EMC performance available on request
(C/US),
FM
Milltronics MFA 4p
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Page 31
Technical data
7.6
Operating Conditions
Location
Indoor/outdoor
Altitude
2 000 m max.
Relative humidity
Suitable for outdoor (Type 4X / NEMA 4X / IP65)*
Pollution degree
4
Related Equipment
Ambient Temperature Range
Approx wt.
RMA
-40 ... 60 °C (-40 ... 140 °F)
2.3 kg (5 lb)
MSP-12
-40 ... 60 °C (-40 ... 140 °F)
1.4 kg (3 lb)
XPP-5
-40 ... 60 °C (-40 ... 140 °F)
1.8 kg (4 lb)
MSP-3
-50 ... 260 °C (-58 ... 500 °F)
1.4 kg (3 lb)
MSP-9
-50 ... 260 °C (-58 ... 500 °F)
1.8 kg (4 lb)
7.6 Operating Conditions
Ambient temperature -20 ... 50 °C (-4 ... 122 °F)
Installation category II
*Type 4/ NEMA 4 /IP65 with mild steel enclosure
Milltronics MFA 4p
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Page 32
Technical data
7.6 Operating Conditions
Milltronics MFA 4p
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Page 33
8
8.1
MFA 4p
8.1.1
Type 4X/NEMA 4X/IP65 Polycarbonate Enclosure
Note
•
•
Dimensions in mm (inch)
① 4.3 (0.17) ∅ mounting holes, 4 places
② Suitable location for conduit entrance
③ Lid screws
Non-metallic enclosure does not provide grounding between conduit connections: use
grounding type bushings and jumpers.
Use only approved, suitable size hubs for watertight application.
Milltronics MFA 4p
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31
Page 34
Dimension drawings
8.1.2
Type 4/NEMA 4/IP65 Painted Steel Enclosure & Type 4X/NEMA 4X/IP65 Stainless Steel Enclosure
Note
•
•
8.1 MFA 4p
Dimensions in mm (inch)
① Suitable location for conduit entrance (customer specified)
Painted steel enclosure does not provide grounding between conduit connections: use
grounding type bushings and jumpers.
Use only approved, suitable size hubs for watertight application.
Milltronics MFA 4p
32 Operating Instructions, 08/2017, A5E33988839_AB
Page 35
Dimension drawings
8.2
Probes
8.2.1
High Temperature Probe MSP-3
8.2 Probes
Dimensions in mm (inch)
① 2" NPSL
② Mounting flange
③ Locknut
④ Probe body
⑤ Gasket
⑥ ½" NPT, tapped both sides
⑦ Mounting centers 111 (4.375)
⑧ 8 (0.312) ∅, 4 holes
⑨ Mounting centers 165 (6.50)
⑩ CAP c/w ½" NPT conduit entrance
● Cast aluminum body comes with cast aluminum cap and zinc flange, zinc plated locknut,
and silicone rubber gasket.
● See Mounting Details (Page 10)
● Pre-amp is mounted in a NEMA 4 cast aluminum enclosure.
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
33
Page 36
Dimension drawings
8.2.2
Stainless Steel Probe MSP-9
8.2 Probes
Dimensions in mm (inch)
① Gasket
② Clamps, 4 places
③ 22 (0.875) ∅, 2 places
④ 102 (4) mounting centers
⑤ 8 (0.312), 4 places
⑥ 171 (6.75) mounting centers
⑦ Cap c/w 22 (0.8758) ∅ hole
Milltronics MFA 4p
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Dimension drawings
8.2.3
Standard Probe MSP-12
8.2 Probes
Dimensions in mm (inch)
① 2" NPSL
② Mounting flange
③ Locknut
④ Probe body
⑤ Gasket
⑥ Cap c/w ½" NPT conduit entrance
● Aluminum body comes with die-cast aluminum cap and zinc flange, zinc plated locknut,
and neoprene gasket.
● See Mounting Details (Page 10)
● Pre-amp is potted in the probe body and comes with two 127 mm (5 inch) long hook-up
wires.
Milltronics MFA 4p
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35
Page 38
Dimension drawings
8.2.4
Hazardous Locations XPP-5
8.2 Probes
Dimensions in mm (inch)
① 2 conductor shielded cable
②
¾" NPT
③ Nameplate
④ 171.5 (6.75) nominal
⑤ Mounting flange
⑥ Locknut
⑦ 2" NSPL
⑧ Probe body (potted alumin um hous i ng)
⑨ Probe body (potted aluminum junction box)
● C.S.A Approved for:
– Class I, Div. 1, Groups A, B, C, and D
– Class II, Div. 1, Groups E, F, and G
– Class III
● Aluminum body with die-cast flange and zinc-plated locknut.
● Pre-amp and cable potted in the probe's body.
Milltronics MFA 4p
36 Operating Instructions, 08/2017, A5E33988839_AB
Page 39
Dimension drawings
See also
8.2 Probes
Interconnection Diagram for XPP-5 (Page 17)
XPP-5 with IMA (internally mounted pr e-amplifier) (Page 16)
Mounting Details (Page 10)
Milltronics MFA 4p
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37
Page 40
Dimension drawings
8.2 Probes
Milltronics MFA 4p
38 Operating Instructions, 08/2017, A5E33988839_AB
Page 41
A
A.1
Principles of Operation
MFA 4p
Probe
Milltronics MFA 4p is a highly sensitive, single setpoint motion sensor alarm unit, used with
MSP and XPP probes. The probe detects an increase or decrease in the speed of rotating,
reciprocating, or conveying equipment and sends the information to the MFA 4p. T he
MFA 4p works with a pre-amplifier which can be internal to the motion sensing probe, or
remote from the motion sensing probe. Pulses generated from the probe are continually
compared to the adjustable setpoint. If the pulse rate is lower than the setpoint, the alarm
relays operating in a faiI-safe mode will de-energize, indicating failure. The relays will not
energize until the pulse rate increases above the setpoint.
The Milltronics probes work on the principle of Faraday’s Laws of Electromagnetic Induction.
When a ferromagnetic object enters the probe’s permanent magnetic field, it distorts the flux
causing it to cut the coil windings and generate a voltage. This voltage is proportional to the
strength of the magnet and the number of wire turns in the coil (constant in the Milltronics
probes) and the speed at which the ferrous target passes through the flux. The generated
voltage is also inversely proportional to the square of the distance between the target and
the probe.
Milltronics MFA 4p
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Page 42
Technical Reference
The relationship between speed and gap of a standard probe
Fig. a
Note
25.4
A.1 Principles of Operation
① Fig. a
② Fig. b
③ Fig. c
The resultant line indicates the threshold tolerance of the accompanying MFA 4p electronics.
For example, in
10 m/minute (35 ft/minute): with a velocity of 0.61 m/minute (2 ft/minute), a maximum gap of
31 mm (1.25 inch) is possible.
mm = 1 inch and 0.305 m = 1 ft
Milltronics MFA 4p
40 Operating Instructions, 08/2017, A5E33988839_AB
, a 100 mm (4 inch) gap requires a minimum velocity of about
Page 43
Technical Reference
Pre-Amplifier (IMA and RMA)
A.1 Principles of Operation
The graph was plotted from tests using four ferrous blocks set equidistantly on a 406 mm
(16 inch) diameter circle on a non-ferrous disc.
The physical shape of the ferrous target generally becomes important at low velocities or
large gaps. At these points, tests indicate that a cubic shape gives the best results due to the
sudden change it causes in the magnetic field.
An increase in block size beyond 50 x 50 x 25 mm (2 x 2 x 1 inch) is generally not as
effective as minimizing the gap, except at very low velocities.
Milltronics manufactures probes to suit a wide variety of environments: low temperature, high
temperature, corrosive, and Class I, II, and III applications.
The pre-amplifier accepts the voltage pulses generated by the probe and converts them into
noise-immune current pulses. Current levels are 12 mA low and 45 mA high. The
preamplifier comes internally mounted in the probe, or in an enclosure for remote mounting.
Internally mounted pre-amplifiers are called IMAs. Remote mounted pre-amplifiers are called
RMAs.
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
41
Page 44
Technical Reference
MFA 4p Operation
Start Delay
A.1 Principles of Operation
The MFA 4p provides a short circuit protected, +24 V DC unregulated supply to the preamp.
In the event that the interconnecting wiring is shorted, output current from the MFA 4p is
automatically limited and the on-board alarm relays are de-energized to indicate failure.
The output current pulses from the pre-amp are super-imposed onto the DC current supply.
These are monitored by Probe LED 1, which is ill uminated at the rate of the incoming pulses
and is useful for positioning the probe.
The rate at which the pulses are received by the MFA 4p is compared to a setpoint reference
signal from the time base generator.
Although two pulses within range are required to energize the relays, as long as the
frequency of the incoming pulses exceeds the setpoint frequency (or is less than that of the
setpoint in the case of overspeed detection), the MFA 4p keeps the alarm relays energized.
The reference generator is frequency adjustable by the pulses per minute (ppm) switch and
potentiometer.
The alarm relays will de-energize after two time constants of the setpoint when the frequency
of the incoming pulses falls below that of the setpoint (or exceeds that of the setpoint in the
case of overspeed detection). The relay status is indicated by Relay LED 2, which is
illuminated when the relays are energized (normal).
The MFA 4p has a 0 to 60 second time delay feature, allowing the monitored device to
accelerate to normal running speed before monitoring begins.
This feature is activated when power is applied to the MFA 4p in parallel with the motor
starter contact coil. The time delay circuit simulates normal operating conditions for the
amount of time as set by the
potentiometer, keeping the alarm relays energized.
If the monitored device does not reach normal speed before the set time period, the relays
will de-energize giving an alarm condition. This feature is not applicable in the overspeed
detection mode.
Milltronics MFA 4p
42 Operating Instructions, 08/2017, A5E33988839_AB
Page 45
B
B.1
Bucket Eleva to rs
Dimensions in mm (inch)
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
43
Page 46
Applications
Figure A
B.1 Bucket Elevators
Dimensions in mm (inch)
Milltronics MFA 4p
44 Operating Instructions, 08/2017, A5E33988839_AB
Page 47
Applications
B.2
Bucket Eleva to r
B.2 Bucket Elevator
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
45
Page 48
Applications
B.3
Shafts
B.3 Shafts
Dimensions in mm (inch)
① Probe
② Probe
③ Key and keyway
④ Shaft 102 (4) ∅ min.
⑤ Added paddle
⑥ Shaft
These methods are viable if the speed is such that the blades or key will provide the number
of pulses required at a minimum velocity of 1.5 m/minute (5 ft/minute). In applications where
exposed moving parts are required, safety shields and precautions should be applied.
Where conditions prevent the sensing of buckets, a belt pulley or paddle mounted on an
exposed shaft end, preferably the tail pulley, may be used.
Milltronics MFA 4p
46 Operating Instructions, 08/2017, A5E33988839_AB
Page 49
Applications
B.4
Rotating Shaft of Rotary Feeder
B.5
Drive Sprocket on Rotary Feeder
B.4 Rotating Shaft of Rotary Feeder
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
47
Page 50
Applications
B.6
Belt Conveyors
B.7
Screw Conveyors
B.6 Belt Conveyors
Dimensions in mm (inch)
① 50 x 50 x 25 (2 x 2 x 1) ferrous blocks or spoked wheel
② Probe
Potential for damage in each application governs the minimum gap allowable. Maximum gap
for operation is 102 mm (4 inch), optimum 25 to 50 mm (1 to 2 inch).
① The probe should be located at the idler end (usually feed end)
② Arrows indicate permissible placement range of the probe
A ferrous mass added behind the flight of a screw conveyor, where it passes the probe aids
Borderline Operation. This mass must be added for all non-ferrous screws.
Milltronics MFA 4p
48 Operating Instructions, 08/2017, A5E33988839_AB
Page 51
Applications
B.8
Screw Conveyor Flights
B.9
End Bearing on Screw Conveyor
B.8 Screw Conveyor Flights
Milltronics MFA 4p
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49
Page 52
Applications
B.10
Non-ferrous Window
B.10 Non-ferrous Window
Dimensions in mm (inch)
① 64 (3.5) ∅ clearance hole
② 6 (0.25) ∅ clearance, 4 holes
③ Conveyor housing
④ Probe and mounting flange
⑤ Bracket
⑥ Weld
⑦ Base plate
⑧ Window
For screw conveyor with trough over 3.1 mm (0.125 inch) thick or for high temperature
applications. The dimensions shown for the base, window, and bracket are the minimum
recommended with tolerances of ± 0.8 mm (0.031 inch). Use 305, 310, or 316 stainless
steel, brass, or aluminum.
The probe may not touch the window if temperatures are in excess of 60 °C (140 °F) when
using the low temperature probes or 260 °C (500 °F) when using the high temperature
probes.
Milltronics MFA 4p
50 Operating Instructions, 08/2017, A5E33988839_AB
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C
Technical Support
Personal contact
Documentation
C.1
Certificates
If this documentation does not provide complete answers to any technical questions you may
have, contact Technical Support at:
● Support request (http://www.siemens.com/automation/support-request
● More information about our Technic a l Suppor t is avai la ble at
Technical Support (http://www.siemens.com/automation/csi/service
Internet Service & Support
In addition to our documentation, Siemens provides a comprehensive support solution at:
● Services & Support (http://www.siemens.com/automation/service&support
If you have additional questions about the device, please contact your Siemens personal
contact at:
● Partner (http://www.automation.siemens.com/partner
In order to find the contact for your product, select under 'All Products and Branches' the
path 'Automation Technology > Sensor Systems'.
You can find documentation on various products and systems at:
● Instructions and manuals Instructions and manuals
(http://www.siemens.com/processinstrumentation/documentation
)
)
)
)
)
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
You can find certificates on the Internet at Milltronics MFA 4p
http://w3.siemens.com/mcms/sensor-systems/en/process-instrumentation/process-
(
protection/motion-sensors/Pages/milltronics-mfa-4p.aspx) or on an included DVD.
51
Page 54
Support
C.1 Certificates
Milltronics MFA 4p
52 Operating Instructions, 08/2017, A5E33988839_AB
Page 55
A
B
C
D
E
H
I
L
M
Ambient temperature range, 29
Applications
belt conveyors, 48
bucket elevator, 45
drive sprocket on rotary feeder, 47
end bearing on screw conveyor, 49
non-ferrous window, 50
rotating shaft of rotary feeder, 47
screw conveyor flights, 49
screw conveyors, 48
shafts, 46
Approvals, 28
Automatic start delay, 19
Belt conveyors, 48
Bucket elevator, 45
Cable length, 16
Calibration, 21
Cleaning, 24
Connecting
automatic start delay, 19
connection to power, 18
MFA 4p circuit board layout, 13
Construction, 28
Customer Support Hotline, 51
Dimensions
MFA 4p, 31, 32
MSP-12, 35
MSP-3, 33
MSP-9, 34
XPP-5, 36
Drive sprocket on rotary feeder, 47
Dynamic range, 27
End bearing on screw conveyor, 49
Hotline, 51
Installing/mounting
location requirements, 9
mounting details, 10
proper mounting, 9
wiring, 11
Interconnection
cable length, 16
MSP-12 probe with IMA, 15
MSP-3 probe with RMA, 14
MSP-9 probe with RMA, 14
XPP-5, 17
XPP-5 probe with IMA, 16
Internet, 51
Layout
MFA 4p, 13
MFA 4p
calibration, 21
circuit board layout, 13
dimensions, 31, 32
overview, 7
principles of operation, 42
wiring for automatic start delay, 19
MSP-12 standard probe
dimensions, 35
interconnection, 15
mounting details, 11
MSP-3 high temperature probe
dimensions, 33
Milltronics MFA 4p
Operating Instructions, 08/2017, A5E33988839_AB
53
Page 56
Index
N
O
P
R
S
T
U
W
X
interconnection, 14
mounting details, 11
MSP-9 stainless steel probe
dimensions, 34
interconnection, 14
mounting details, 10
Non-ferrous window, 50
Operating conditions, 29
Outputs, 28
Overspeed, 22
Performance, 27
Power, 27
Pre-amplifier (IMA and RMA), 41
Principles of operation
MFA 4p operation, 42
pre-amplifier (IMA and RMA), 41
probe, 39
Probe
dimensions, 33, 34, 35, 36
mounting details, 10
principles of operation, 39
Support, 51
Technical data
approvals, 28
construction, 28
operating conditions, 29
outputs, 28
performance, 27
power, 27
Temperature coefficient, 27
Troubleshooting, 25
Underspeed, 21
Wiring, 11
XPP-5
dimensions, 36
interconnection, 16
interconnection diagram , 17
mounting details, 11
Repeatability, 27
Resistive rating, 28
Rotating shaft of rotary feeder, 47
Safety notes, 5
Screw conveyor flights, 49
Screw conveyors, 48
Service, 51
Service and maintenance, 24
calibration, 21
cleaning, 24
signal generator interface, 23
Setpoint adjustment range, 27
Shafts, 46
Signal generator interface, 23
Milltronics MFA 4p
54 Operating Instructions, 08/2017, A5E33988839_AB
Page 57
For more information
www.siemens.com/level
www.siemens.com/weighing
Siemens Canada Limited
1954 Technology Drive
P.O. Box 4225
Peterborough, ON
Canada K9J 7B1
www.siemens.com/processautomation
Printed in Canada
Subject to change without prior notice
A5E33988839 Rev. AB
© Siemens AG 2017
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