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Milltronics
Motion Sensors
Milltronics MFA 4p
Operating Instructions
7MH7144 (MFA 4p)
12/2020
A5E33988839-AC
Introduction
Milltronics MFA 4p
Overview
Installing/mounting
Connecting
Service and maintenance
Troubleshooting
Technical data
Dimension drawings
Technical Reference
Applications
Product documentation and
support
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Table of Contents
Related Manuals for Siemens 7MH7144
Summary of Contents for Siemens 7MH7144
- Page 1 Introduction Milltronics MFA 4p Overview Milltronics Installing/mounting Connecting Motion Sensors Milltronics MFA 4p Service and maintenance Troubleshooting Operating Instructions Technical data Dimension drawings Technical Reference Applications Product documentation and support 7MH7144 (MFA 4p) 12/2020 A5E33988839-AC...
- Page 2 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.
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Page 3: Table Of Contents
Table of contents Introduction ............................5 Transportation and Storage ....................5 Unit Repair and Excluded Liability ..................5 Milltronics MFA 4p Overview ........................ 7 Installing/mounting ..........................8 Location Requirements ......................8 Proper Mounting........................8 Mounting Details ......................... 9 Wiring ..........................10 Connecting ............................ - Page 4 Table of contents Dimension drawings ..........................25 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 Probes ..........................27 8.2.1 High Temperature Probe MSP-3 ..................27 8.2.2 Stainless Steel Probe MSP-9 ....................
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Page 5: Introduction
• 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. - Page 6 Introduction 1.2 Unit Repair and Excluded Liability 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...
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Page 7: Milltronics Mfa 4P Overview
Milltronics MFA 4p Overview 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. -
Page 8: Installing/Mounting
Installing/mounting Note Installation shall only be performed by qualified personnel and in accordance with local governing regulations. 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. -
Page 9: Mounting Details
Installing/mounting 3.3 Mounting Details Mounting Details MSP-9 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 •... -
Page 10: Wiring
Installing/mounting 3.4 Wiring 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... -
Page 11: Connecting
Connecting MFA 4p Circuit Board Layout Milltronics MFA 4p Operating Instructions, 12/2020, A5E33988839-AC... -
Page 12: Interconnection
Connecting 4.2 Interconnection 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. -
Page 13: Msp-12 Probe With Ima (Internally Mounted Pre-Amplifier)
Connecting 4.2 Interconnection 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 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... -
Page 14: Cable Length From Rma Or Ima To Mfa 4P
Connecting 4.2 Interconnection 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 2 500 18 AWG (0.75 mm 5 000 1 520 12 AWG (4 mm... -
Page 15: Interconnection Diagram For Xpp-5
Connecting 4.2 Interconnection 4.2.5 Interconnection Diagram for XPP-5 Milltronics MFA 4p Operating Instructions, 12/2020, A5E33988839-AC... -
Page 16: Connection To Power
Connecting 4.3 Connection to Power 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. •... -
Page 17: Mfa 4P Wiring For Automatic Start Delay
Connecting 4.4 MFA 4p Wiring for Automatic Start Delay 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. -
Page 18: Service And Maintenance
Service and maintenance 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). -
Page 19: Signal Generator Interface
Service and maintenance 5.2 Signal Generator Interface Overspeed 1. Set switch SW3 to Overspeed. 2. Set ppm switch 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. -
Page 20: Cleaning
Service and maintenance 5.3 Cleaning ① Signal generator ② 6 V p-p sine ③ 6 V p-p square ④ 3 V p square 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. -
Page 21: Troubleshooting
Troubleshooting Troubleshooting LED 1 LED 2 Term 7/8 Term 1/2 Term 4/5 (note 1) relay 1 out relay 2 out Normal pulsing 24 V 27 V closed closed Alarm pulsing 24 V 27 V open open Probe reversed 20 V 27 V open open... - Page 22 Troubleshooting 6.1 Troubleshooting 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.
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Page 23: Technical Data
Technical data Note Always use product in accordance with specifications. Power • 100 ... 240 V AC ± 10 %, 50/60 Hz, 15 VA Fuse: 5 x 20 mm, Slow Blow, 1A, 250 V Performance Repeatability • ± 1 % Temperature coefficient (setpoint variance) •... -
Page 24: Construction
Technical data 7.4 Construction Resistive rating • 8 A @ 250 V AC Construction Weight • Polycarbonate enclosure: 1.5 kg (3.3 lb) • Mild steel or stainless steel enclosure: 4.3 kg (9.5 lb) Approvals • CE, CSA , FM (C/US) •... -
Page 25: Dimension Drawings
Dimension drawings MFA 4p 8.1.1 Type 4X/NEMA 4X/IP65 Polycarbonate Enclosure Dimensions in mm (inch) ① 4.3 (0.17) ∅ mounting holes, 4 places ② Suitable location for conduit entrance ③ Lid screws Note • Non-metallic enclosure does not provide grounding between conduit connections: use grounding type bushings and jumpers. -
Page 26: Type 4/Nema 4/Ip65 Painted Steel Enclosure & Type 4X/Nema 4X/Ip65 Stainless Steel Enclosure
Dimension drawings 8.1 MFA 4p 8.1.2 Type 4/NEMA 4/IP65 Painted Steel Enclosure & Type 4X/NEMA 4X/IP65 Stainless Steel Enclosure Dimensions in mm (inch) ① Suitable location for conduit entrance (customer specified) Milltronics MFA 4p Operating Instructions, 12/2020, A5E33988839-AC... -
Page 27: Probes
Dimension drawings 8.2 Probes Note • 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. Probes 8.2.1 High Temperature Probe MSP-3 Dimensions in mm (inch) ①... -
Page 28: Stainless Steel Probe Msp-9
Dimension drawings 8.2 Probes 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 9) • Pre-amp is mounted in a NEMA 4 cast aluminum enclosure. 8.2.2 Stainless Steel Probe MSP-9 Dimensions in mm (inch) -
Page 29: Standard Probe Msp-12
Dimension drawings 8.2 Probes 8.2.3 Standard Probe MSP-12 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. -
Page 30: Hazardous Locations Xpp-5
Dimension drawings 8.2 Probes 8.2.4 Hazardous Locations XPP-5 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 aluminum housing) ⑨... -
Page 31: Technical Reference
Technical Reference Principles of Operation MFA 4p 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. - Page 32 Technical Reference A.1 Principles of Operation The relationship between speed and gap of a standard probe 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 Fig. a, a 100 mm (4 inch) gap requires a minimum velocity of about 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.
- Page 33 Technical Reference 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.
- Page 34 Technical Reference A.1 Principles of Operation 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).
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Page 35: Applications
Applications Bucket Elevators Dimensions in mm (inch) Milltronics MFA 4p Operating Instructions, 12/2020, A5E33988839-AC... -
Page 36: Bucket Elevator
Applications B.2 Bucket Elevator Figure A Dimensions in mm (inch) Bucket Elevator Milltronics MFA 4p Operating Instructions, 12/2020, A5E33988839-AC... -
Page 37: Shafts
Applications B.3 Shafts 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). -
Page 38: Rotating Shaft Of Rotary Feeder
Applications B.4 Rotating Shaft of Rotary Feeder Rotating Shaft of Rotary Feeder Drive Sprocket on Rotary Feeder Milltronics MFA 4p Operating Instructions, 12/2020, A5E33988839-AC... -
Page 39: Belt Conveyors
Applications B.6 Belt Conveyors 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). -
Page 40: Screw Conveyor Flights
Applications B.8 Screw Conveyor Flights Screw Conveyor Flights End Bearing on Screw Conveyor Milltronics MFA 4p Operating Instructions, 12/2020, A5E33988839-AC... -
Page 41: Non-Ferrous Window
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. -
Page 42: Product Documentation And Support
Entering a serial number 1. Open the PIA Life Cycle Portal (https://www.pia-portal.automation.siemens.com). 2. Select the desired language. 3. Enter the serial number of your device. The product documentation relevant for your device is displayed and can be downloaded. - Page 43 In addition to our technical support, Siemens offers comprehensive online services at Service & Support (http://www.siemens.com/automation/serviceandsupport). Contact If you have further questions about the device, contact your local Siemens representative at Personal Contact (http://www.automation.siemens.com/partner). To find the contact for your product, go to "all products and branches" and select "Products &...
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Page 44: Index
Index Customer Support, (Refer to Technical support) Ambient temperature range, 24 Dimensions Applications MFA 4p, 25, 26 belt conveyors, 39 MSP-12, 29 bucket elevator, 36 MSP-3, 28 drive sprocket on rotary feeder, 38 MSP-9, 28 end bearing on screw conveyor, 40 XPP-5, 30 non-ferrous window, 41 Downloads, 42... - Page 45 Index Layout Performance, 23 MFA 4p, 11 Power, 23 Pre-amplifier (IMA and RMA), 33 Principles of operation Manuals, 42 MFA 4p operation, 33 MFA 4p pre-amplifier (IMA and RMA), 33 calibration, 18 probe, 31 circuit board layout, 11 Probe dimensions, 25, 26 dimensions, 28, 28, 29, 30 overview, 7 mounting details, 9...
- Page 46 Index Technical data approvals, Error! Bookmark not defined. construction, 24 operating conditions, Error! Bookmark not defined. outputs, 24 performance, 23 power, 23 Technical support, 43 partner, 43 personal contact, 43 Temperature coefficient, 23 Troubleshooting, 21 Underspeed, 18 Wiring, 10 XPP-5 dimensions, 30 interconnection, 13 interconnection diagram, 15...