Milltronics MD-256 Manuale utente
Instruction Manual PL-543 September 2001
MD-256 SPEED SENSOR
MD-256 SPEED SENSOR
© Siemens Milltronics Process Instruments Inc. 2001
Safety Guidelines
Warning notices must be observed to ensure personal safety as well as that of others, and to
protect the product and the connected equipment. These warning notices are accompanied
by a clarification of the level of caution to be observed.
Qualified Personnel
This device/system may only be set up and operated in conjunction with this manual.
Qualified personnel are only authorized to install and operate this equipment in accordance
with established safety practices and standards.
Warning: This product can only function properly and safely if it is correctly transported,
stored, installed, set up, operated, and maintained.
Note: Always use product in accordance with specifications.
Copyright Siemens Milltronics Process
Instruments Inc. 2001. All Rights Reserved Disclaimer of Liability
This document is available in bound version and in
electronic version. We encourage users to
purchase authorized bound manuals, or to view
electronic versions as designed and authored by
Siemens Milltronics Process Instruments Inc.
Siemens Milltronics Process Instruments Inc. will
not be responsible for the contents of partial or
whole reproductions of either bound or electronic
versions.
While we have verified the contents of
this manual for agreement with the
instrumentation described, variations
remain possible. Thus we cannot
guarantee full agreement. The
contents of this manual are regularly
reviewed and corrections are included
in subsequent editions. We welcome
all suggestions for improvement.
Technical data subject to change.
MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments Inc.
Contact SMPI Technical Publications at the following address:
Technical Publications
Siemens Milltronics Process Instruments Inc.
1954 Technology Drive, P.O. Box 4225
Peterborough, Ontario, Canada, K9J 7B1
Email: techpubs@milltronics.com
For the library of SMPI instruction manuals, visit our Web site: www.milltronics.com
7ML19981FJ01 MD-256 Speed Sensor Page 1
Table of Contents
Specifications
......................................................................................2
General Operation
...............................................................................3
Circuit ..............................................................................................3
Installation
............................................................................................4
Dimensions......................................................................................4
Mounting..........................................................................................5
Mounting to a Tail Pulley .................................................................6
Mounting to a Bend or Snub Pulley .................................................7
General Installation Steps....................................................................8
Interconnection (Wiring) ......................................................................9
Terminals.........................................................................................9
Terminal Connections to Milltronics Integrators ............................10
Maintenance
.......................................................................................11
Inspection ......................................................................................11
Bearing Replacement....................................................................11
Bearing Replacement Procedure ..................................................12
Page 2 MD-256 Speed Sensor 7ML19981FJ01
Specifications
Power
•+10 to +15V dc, 30mA (from integrator)
Ambient Temperature
•-40° to 55° C (-40°F to 131°F)
Input
•Shaft rotation 0.5 to 470 rpm, bi-directional
Output
•Uni-directional open collector sinking output
•+5V dc, 25mA max (to integrator)
•256 pulses per revolution
•2 to 2000Hz
Enclosure
•General purpose
•Aluminum
Approvals
•NEMA 4x
•IP65
•CE
Cable (optional)
•3-wire shielded, 0.75mm2(18 AWG)
•Max run 305m (1000’)
Weight
•1.22 kg (2.68 lb.)
7ML19981FJ01 MD-256 Speed Sensor Page 3
General Operation
The MD-256 is a digitizing speed sensor for belt scales. It connects to the
shaft of a pulley and measures the shaft's rotation by sending pulses to the
Milltronics integrator.
This small. light-weight speed sensor features:
•High resolution for accurate measurement
•Long bearing life
Circuit
256 pulses are generated for each rotation of the MD-256 shaft. These
pulses are typically fed into a Milltronics belt scale integrator. The integrator
interprets the pulses and uses them in the calculation of belt speed, flow
rate, and material totalization.
Integrators with which the MD-256 works are:
•CompuScale
•CompuScale II
•CompuScale IIA
•CompuScale-III
•Compu-M
•Accumass BW100
•Accumass BW500
•Competitive integrators – consult your local Milltronics representative
Page 4 MD-256 Speed Sensor 7ML19981FJ01
Installation
Note: Installation must only be performed by qualified personnel.
Dimensions
Rod ∅: 8.0mm
(5/16” )
305mm
(12.0”)
89mm
(3.5”)
60mm
(2.38”)
1/2" NPT conduit entrance
(optional PG13.5 adapter available)
1/2" NPT conduit entrance
(optional PG13.5 adapter available)
Shaft ∅: 15.9mm
(5/8")
102mm
(4.00”)
159mm
(6.25”)
102mm
(4.03”)
50mm
(1.96”)
131mm
(5.16”)
111mm
(4.36”)
7ML19981FJ01 MD-256 Speed Sensor Page 5
Mounting
The input shaft on the MD-256 is coupled to the rotating shaft on a belt
driven pulley and is not externally supported. The unit’s arresting rod stops it
from rotating with the shaft and can be fitted with a spring to soften sudden
speed changes.
WARNING:
The arresting rod should only be solidly attached to the MD-256.
Fixing the rod at both ends will apply binding forces and cause the
unit’s bearings to wear prematurely.
When mounting the unit, ensure that it is concentric with the pulley shaft to
avoid stresses on the unit’s bearings.
For preferred mounting locations, refer to the associated belt scale or weigh
feeder instruction manual.
Manuals for these integrators are:
CompuScale PL-216
CompuScale II PL-261
CompuScale IIA PL-281
CompuScale-III PL-367
Compu-M PL-516
Accumass BW100 PL-531
Accumass BW500 PL-565
Page 6 MD-256 Speed Sensor 7ML19981FJ01
Mounting to a Tail Pulley
Notes:
•Distance (d) is the take up travel on the tail pulley
•When adjusting the belt take up, ensure there is play on the arrestor
rod. If the arrestor rod is pushed against the end of its travel slot,
premature bearing wear may result.
d
Angle bracket slotted
for arrestor rod
Tension Spring (supplied)
Flexible Conduit
MD-256
Angle bracket slotted
for Arrestor Rod Tension Spring
Arrestor Rod (cut to suit)
MD-256
Flexible Conduit
Belt
89mm
3.5”
≥10mm (.375”)
7ML19981FJ01 MD-256 Speed Sensor Page 7
Mounting to a Bend or Snub Pulley
Notes:
•When mounting to a bend or snub pulley only a 3/8” (10mm) drilled
hole is required for the arrestor rod.
Tension Spring (supplied)
Stringer
Belt
Flexible Conduit
MD-256
Stringer
3/8” drilled hole for
Arrestor Rod
Bend or Snub Pulley
Tension Spring
Arrestor Rod (cut to suit)
90mm
3.5”
MD-256
Flexible
Conduit
Pulley Bearing
Page 8 MD-256 Speed Sensor 7ML19981FJ01
General Installation Steps
1. Drill out pulley shaft to a depth of 64mm (2.5”) concentric to its centerline.
Warning:
Exercise caution and remain within specified tolerances.
2. Drill out and thread the set screw hole.
3. Attach angle iron bracket to work with the arrestor rod (if mounting on a tail
pulley).
4. Cut the arrestor rod to a suitable length.
5. Insert the MD-256 shaft into the pulley shaft and lock with set screw on flat
of shaft.
6. Attach spring to arresting rod and frame.
7. Encase wiring in flexible conduit to allow unit to float.
8. Wire the MD-256 to the Milltronics’ integrator. See Terminal Connections
to Milltronics Integrators on page 10 for terminal post connections.
Warning:
The arresting rod should only be solidly attached to the MD-256.
Fixing the rod at both ends will apply binding forces and wear the
unit’s bearings prematurely.
127mm
(5”) approx.
Tension Spring
Secure with
bolt or post
Angle Iron Bracket or
Conveyor Stringer Web
Example slot for
arrestor rod when
mounted to tail
pulley – use
drilled hole for
snub or bend
pulley
M8x1.25 (5/16-18 UNC)
set screw (by customer)
64mm
(2.5”)
25mm
(1”)
16.00mm (.630”) DIA.
16.07mm (.633”)
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