Siemens 7MH7144 User manual

Milltronics
Motion Sensors
Milltronics MFA 4p
Operating Instructions
7MH7144 (MFA 4p)
12/2020
A5E33988839
-AC
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
Product documentation and
support
C

Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E33988839
Ⓟ
02/2021 Subject to change
Copyright © Siemens AG 2020.
All rights reserved
Legal information
Warning notice system
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.
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.
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.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
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.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
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
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
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.
Disclaimer of Liability
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.

Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 3
Table of contents
1 Introduction........................................................................................................................................... 5
1.1 Transportation and Storage.................................................................................................. 5
1.2 Unit Repair and Excluded Liability......................................................................................... 5
2 Milltronics MFA 4p Overview ................................................................................................................ 7
3 Installing/mounting ............................................................................................................................... 8
3.1 Location Requirements ........................................................................................................ 8
3.2 Proper Mounting.................................................................................................................. 8
3.3 Mounting Details ................................................................................................................. 9
3.4 Wiring ............................................................................................................................... 10
4 Connecting .......................................................................................................................................... 11
4.1 MFA 4p Circuit Board Layout .............................................................................................. 11
4.2 Interconnection ................................................................................................................. 12
4.2.1 MSP-3 or MSP-9 Probe with RMA (remote mounted amplifier) ............................................ 12
4.2.2 MSP-12 Probe with IMA (internally mounted pre-amplifier) ................................................ 13
4.2.3 XPP-5 with IMA (internally mounted pre-amplifier)............................................................. 13
4.2.4 Cable length from RMA or IMA to MFA 4p .......................................................................... 14
4.2.5 Interconnection Diagram for XPP-5 .................................................................................... 15
4.3 Connection to Power ......................................................................................................... 16
4.4 MFA 4p Wiring for Automatic Start Delay............................................................................ 17
5 Service and maintenance .................................................................................................................... 18
5.1 Calibration......................................................................................................................... 18
5.2 Signal Generator Interface ................................................................................................. 19
5.3 Cleaning............................................................................................................................ 20
5.4 Maintenance ..................................................................................................................... 20
6 Troubleshooting .................................................................................................................................. 21
6.1 Troubleshooting ................................................................................................................ 21
7 Technical data...................................................................................................................................... 23
7.1 Power................................................................................................................................ 23
7.2 Performance...................................................................................................................... 23
7.3 Outputs ............................................................................................................................. 23
7.4 Construction...................................................................................................................... 24
7.5 Approvals .......................................................................................................................... 24
7.6 Operating Conditions......................................................................................................... 24

Table of contents
Milltronics MFA 4p
4Operating Instructions, 12/2020, A5E33988839-AC
8 Dimension drawings............................................................................................................................ 25
8.1 MFA 4p.............................................................................................................................. 25
8.1.1 Type 4X/NEMA 4X/IP65 Polycarbonate Enclosure................................................................ 25
8.1.2 Type 4/NEMA 4/IP65 Painted Steel Enclosure & Type 4X/NEMA 4X/IP65 Stainless Steel
Enclosure .......................................................................................................................... 26
8.2 Probes ............................................................................................................................... 27
8.2.1 High Temperature Probe MSP-3 ......................................................................................... 27
8.2.2 Stainless Steel Probe MSP-9 ............................................................................................... 28
8.2.3 Standard Probe MSP-12 ..................................................................................................... 29
8.2.4 Hazardous Locations XPP-5 ................................................................................................ 30
A Technical Reference ............................................................................................................................ 31
A.1 Principles of Operation....................................................................................................... 31
B Applications......................................................................................................................................... 35
B.1 Bucket Elevators ................................................................................................................ 35
B.2 Bucket Elevator.................................................................................................................. 36
B.3 Shafts................................................................................................................................ 37
B.4 Rotating Shaft of Rotary Feeder.......................................................................................... 38
B.5 Drive Sprocket on Rotary Feeder ........................................................................................ 38
B.6 Belt Conveyors................................................................................................................... 39
B.7 Screw Conveyors ............................................................................................................... 39
B.8 Screw Conveyor Flights...................................................................................................... 40
B.9 End Bearing on Screw Conveyor......................................................................................... 40
B.10 Non-ferrous Window.......................................................................................................... 41
C Product documentation and support .................................................................................................. 42
C.1 Product documentation ..................................................................................................... 42
Index.................................................................................................................................................... 44

Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 5
Introduction
1
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.
Note
The MFA 4p (Motion Failure Alarm) is to be
used only in the manner outlined in this manual,
otherwise protection provided by the equipment may be impaired.
1.1 Transportation and Storage
WARNING
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.
1.2 Unit Repair and Excluded Liability
•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.

Introduction
1.2 Unit Repair and Excluded Liability
Milltronics MFA 4p
6Operating Instructions, 12/2020, A5E33988839-AC
Note
This product is intended for use in industrial areas.
In a domestic environment this device may cause radio interference.

Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 7
Milltronics MFA 4p Overview
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 de-
energize, indicating failure. The relays will not energize until the pulse rate increases above
the setpoint.

Milltronics MFA 4p
8Operating Instructions, 12/2020, A5E33988839-AC
Installing/mounting
3
Note
Installation shall only be performed by qualified personnel and in accordance with local
governing regulations.
3.1 Location Requirements
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.
Note
Do not mount MFA 4p in direct sunlight.
3.2 Proper Mounting
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 35).
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.
Functionality loss indicators:
•Alarm conditions by relay trip
•False pulse readings in LED1

Installing/mounting
3.3 Mounting Details
Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 9
3.3 Mounting Details
MSP-9 Mounting Details
Dimensions in mm (inch)
①6 (0.25) ∅ 4 holes equally spaced on a 114 (4.5) BCD
②95 (3.75) ∅ probe clearance hole
③Panel cutout
④Probe 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 Teflon1) cable potted in probe
•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
MSP-3, MSP-12, XPP-5 Mounting Details
Dimensions in mm (inch)
①95 (3.75) ∅ probe clearance hole

Installing/mounting
3.4 Wiring
Milltronics MFA 4p
10 Operating Instructions, 12/2020, A5E33988839-AC
②6 (0.25) ∅ hole for ¼ - 20 nut and bolt or drill and tap, four holes on 114 (4.5) BCD
③6 (0.25) ∅ hole for ¼ - 20 bolt on 114 (4.5) BCD, four places
④113 (5.25) O.D.
⑤2" NSPL
3.4 Wiring
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
11 Operating Instructions, 12/2020, A5E33988839-AC
Connecting
4
4.1 MFA 4p Circuit Board Layout

Connecting
4.2 Interconnection
Milltronics MFA 4p
12 Operating Instructions, 12/2020, A5E33988839-AC
4.2 Interconnection
Note
Use shielded cable and connect all cable
shields to the MFA shield terminals to avoid
differential ground loops.
4.2.1 MSP-3 or MSP-9 Probe with RMA (remote mounted amplifier)
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 14) for cable lengths from RMA to main
group.

Connecting
4.2 Interconnection
Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 13
4.2.2 MSP-12 Probe with IMA (internally mounted pre-amplifier)
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 14) for cable lengths from probe at MFA
4p.
4.2.3 XPP-5 with IMA (internally mounted pre-amplifier)
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 14) for cable lengths from probe at MFA 4p.

Connecting
4.2 Interconnection
Milltronics MFA 4p
14 Operating Instructions, 12/2020, A5E33988839-AC
Note
Refer to
Interconnection Diagram for XPP-5 (Page 15)
4.2.4 Cable length from RMA or IMA to MFA 4p
Wire gauge
Length in feet
Length in meters
22 AWG (0.34 mm
2
)
2 500
760
18 AWG (0.75 mm
2
)
5 000
1 520
12 AWG (4 mm
2
)
25 000
7 600

Connecting
4.2 Interconnection
Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 15
4.2.5 Interconnection Diagram for XPP-5

Connecting
4.3 Connection to Power
Milltronics MFA 4p
16 Operating Instructions, 12/2020, A5E33988839-AC
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.

Connecting
4.4 MFA 4p Wiring for Automatic Start Delay
Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 17
4.4 MFA 4p Wiring for Automatic Start Delay
Note
1.
Interlocks and Safety Pull Switches are not shown.
2.
If START
is initiated by programmable logic controller, closure time may be too brief to allow
MFA 4p contact to latch. In this case, program a timer contact into the circuit.
3.
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 Time Delay feature on start-up not be required, power should be applied
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.

Milltronics MFA 4p
18 Operating Instructions, 12/2020, A5E33988839-AC
Service and maintenance
5
5.1 Calibration
The probe and pre-amplifier require no calibration.
Connect the probe, pre-amp, and MFA 4p as shown in the Interconnection (Page 12) chapter.
Connect the MFA 4p to power as shown in the Connection to Power (Page 16) diagram, and
if applicable, as shown for MFA 4p Wiring for Automatic Start Delay (Page 17).
Note
To help the calibration procedure, short N.O. contacts of relays to prevent motor shutdown
(terminals 1 to 2 and/or 4 to 5). This allows the system to run
uninterrupted until an
operating setpoint is established.
MFA 4p
Refer to MFA 4p Circuit Board Layout (Page 11)
1. Operate monitored equipment at its normal operating speed.
2. Confirm that Probe LED 1 is pulsing at a regular frequency.
3. Set Start Delay fully counter-clockwise (CCW) to 0seconds.
Underspeed
1. Set switch SW3 to Underspeed.
2. Set pulses per minute (ppm) switch SW2 to X 100 position.
3. Turn ppm potentiometer fully clockwise (CW) to 30.
4. Determine incoming pulse rate by slowly turning ppm potentiometer CCW until relay LED 2
goes on. As the MFA 4p requires 2 pulses within range before energizing relays, low ppm
applications (e.g. 2 ppm) may require stepping of potentiometer at appropriate time
intervals.
5. If no response is obtained when you set the ppm potentiometer to 3(below this stability
suffers), reset potentiometer fully CW, set switch SW2 to X 10 and then X 1 if required, and
repeat step 4.
6. When Relay LED 2 goes on, indicating the incoming pulse rate, turn potentiometer CCW
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 SW2 if
required) to halfway between incoming pulse rate of normal speed and 0ppm.
7. Set Start Delay by adjusting potentiometer so that equipment being monitored can attain
normal operating speed before LED 2 can turn off.

Service and maintenance
5.2 Signal Generator Interface
Milltronics MFA 4p
Operating Instructions, 12/2020, A5E33988839-AC 19
Overspeed
1. Set switch SW3 to Overspeed.
2. Set ppmswitch SW2 to X 1 position.
3. Set ppm potentiometer fully CCW to 0.
4. Determine incoming pulse rate by slowly turning ppm potentiometer CW until Relay LED 2
goes on. Because the MFA 4p requires 2 pulses within range before energizing relays, low
ppm applications (e.g. 2 ppm) may require stepping of potentiometer at appropriate time
intervals.
5. If no response is obtained when you set the ppm potentiometer to 3, (below this stability
suffers), reset potentiometer fully CCW and set switch SW2 to X 10, and then X 1if
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.
Note
If N.O. contacts were shorted as described in final note of calibration preamble, remove them
now as calibration is complete.
5.2 Signal Generator Interface

Service and maintenance
5.3 Cleaning
Milltronics MFA 4p
20 Operating Instructions, 12/2020, A5E33988839-AC
①Signal generator
②6 V p-p sine
③6 V p-p square
④3 V p square
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.
5.4 Maintenance
The Motion Failure Alarm MFA 4p requires no maintenance: however, we recommend a
program of periodic checks.