Milltronics MD-2000A SS User manual

MD-2000A SPEED SENSOR
Instruction Manual June 2002
MD-2000A SPEED SENSOR

© Siemens MilltronicsProcessInstruments Inc. 2002
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. 2002. AllRightsReserved 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: [e-mail]
For the libraryof SMPI instruction manuals, visitour Web site: www.siemens-milltronics.com

SPECIFICATIONS
Power: » +15 V dc, 150 mA from integrator
Temperature: » -20 to 55°C (-4 to 130° F)
Input: » bi-directional shaft rotation
» 0.3 to 75 rpm operating input
Output: » open collector sinking output, max. 25 mA at 5 V dc
» 2048 pulses / revolution
» 10 to 2,560 Hz operating output
Enclosure: » general purpose
» material : - standard : aluminum
- optional : 304 stainless steel
Cable: » Belden 8770, 3 wire shielded, 18 AWG or equivalent
» max run 305 m (1000 ft)
REFERENCE
Associated Milltronics integrator:
CompuScale III
BW100
BW500
GENERAL
The MD-2000A speed sensor is used to monitor the speed of a weighfeeder or low speed belt conveyor ( see
input specification ). The sensor, coupled to a pulley shaft, converts the rotation of its input shaft into an
encoded speed signal. The speed signal is transmitted to the integrating electronics for use in computing the
rate of material flow.
CIRCUIT OPERATION
The speed sensor is made up of a main shaft rotating in a bearing assembly fixed to the enclosure. The shaft
turns an encoder which produces two square wave quadrature (90° electrically out of phase) outputs which
are fed to the speed sensor board to determine direction of rotation as well as the speed of rotation.
Power is provided by the integrating device. The 15 V dc supply is regulated to 5 V dc for use by the encoder
circuit and output drive transistors of the speed sensor board.
As the shaft rotates, the two quadrature square waves from the 2048 pulse per revolution encoder are
converted into clockwise (CW) and counter clockwise (CCW) square wave output signals by the intermediate
counter logic. When the shaft rotates in the CW direction, the logic produces pulses at the CW output and the
CCW output is disabled. When the shaft rotates in the CCW direction, the logic produces pulses at the CCW
output and the CW output is disabled.
The logic diagrams detail the operation of the electronics for both clockwise and counter clockwise output
generation. The speed sensor is immune to external vibration that would cause the encoder to oscillate 1/8 of
a revolution or less.
PL-361 1

MOUNTING
The MD-2000A speed sensor is usually coupled to the tail pulley shaft of a weighfeeder. On low speed
conveyers, the speed sensor may be coupled to the tail, bend or snub pulley. The mounting arrangement
requires the input shaft and bearing assembly to bear the weight of the speed sensor. The unit’s arresting
bracket stops the speed sensor from rotating with the shaft.
When mounting the speed sensor, ensure that the shaft alignment is true to avoid stresses on the shaft
bearing. Refer to ( MD - 2000A Series Pulley Mounting ).
INTERCONNECTION
ALL WIRING MUST BE DONE IN CONJUNCTION WITH APPROVED
CONDUIT, BOXES AND FITTINGS AND TO PROCEDURES IN
ACCORDANCE WITH ALL GOVERNING REGULATIONS.
Interconnection between the speed sensor and the integrator should be made with 3 wire shielded, 18 AWG
cable (Belden 8770 or equivalent).
Ground the shield at the integrator ONLY!
FLEXIBLE CONDUIT IS RECOMMENDED SO EXCESS STRESS IS NOT
APPLIED TO THE SHAFT BEARINGS.
SPEED SENSOR INTERCONNECTION
Terminal positions in brackets denote that only one signal may be connected at one time. To determine
direction of rotation refer to ( MD - 2000A Series Pulley Mounting ).
‘ N/C ’ denotes ‘ no connection ’
MD-2000A BW100 BW500 COMPUSCALE III
DESCRIPTION TERMINAL TO 1TB
+15 V DC(Red) 1 8 19 30
speed out-CW
(White)
2 (7) (16) (31)
speed out-CCW
(Blue)
3 (7) (16) (31)
Common
(Black)
4 6 17 32
Ground 5 N\C N\C N\C
PL-361 2

MAINTENANCE
The speed sensor electronics normally requires no maintenance, however a program of periodic checks
would be beneficial. The enclosure and circuit board should be cleaned if necessary, but only when the
power is disconnected using a vacuum cleaner and a clean dry paint brush. Check all electrical contacts for
corrosion and arcing.
The speed sensor bearing should be periodically checked for corrosion, wear and seizing. The bearings life is
dependent upon the mounting, the severity of the application and surrounding environment.
SPARE PARTS
Bearing Assembly: - MD 2000A
- MD 2000A SS
Speed Sensor Card - without encoder
- with encoder
PL-361 3

TRONICS
MILL
TRONICS
MILL
( ref. )
61 mm
( 2.4")
213 mm
( 8.4" )
112 mm
( 4.4" )
16 mm ( 0.63" )
Ø shaft
114 mm
( 4.5" )
117 mm
( 4.6" )
124 mm
( 4.9" )
6 mm ( 0.25" )
Ø shaft
(2 places)
61 mm
( 2.4" )
142 mm
( 5.6" )
71 mm
( 2.8" )
218 mm
( 8.6" )
142 mm
( 5.6" )
71 mm
( 2.8" )
21 mm
( 0.8" )
84 mm
( 3.3" )
56 mm
( 2.2" )
1/2 NPT plug
(2 places)
MD - 2000A OUTLINE
PL-361 492/12/08

( ref. )
76 mm
( 3" )
216 mm
( 8.5" )
102 mm
( 4" )
16 mm ( 0.63" )
Ø shaft
114 mm
( 4.5" )
127 mm
( 5" )
86 mm
( 3.4" )
6 mm ( 0.25" )
Ø shaft
(2 places)
61 mm
( 2.4" )
152 mm
( 6" )
76 mm
( 3" )
239 mm
( 9.4" )
152 mm
( 6" )
19 mm
( 0.75" )
21 mm
( 0.8" )
38 mm
( 1.5" ) 51 mm
( 2" )
76 mm
( 3" )
cable connector
for 3 to 9 mm (.125"
to .25") o.d. cable
127 mm
( 5" )
MD - 2000A SS OUTLINE

HS1
IC4
RP1
RP2
IC3
IC2
IC1
RP3
C3 C4
C1
C2
R8
C5
C6
R7
R6 R5
Q1 Q2
R4
R3
R2
R1
D1
1
2
3
4
5
P15V
CW
CCW
GND
MD2000A
MADE IN CANADA
P5V
ABOV
CN1
SN
PETERBOROUGH,
ONTARIO.
ARLINGTON,TEXAS
WORCESTER,ENGLAND
10D775
S3
D
COM
J1
J2
J3
PN 24751320
ML 51026001
R9
R10
1TB
R1
(RED)
(WHT)
(BLU)
(BLK)
(GRN)
MD - 2000A SERIES CIRCUIT BOARD LAYOUT
customer connection
to integrator, refer to
associated integrator
manual.
PL-361 6

A
A.254mm(.010")
arresting bracket (by Milltronics)
shorten if required, refer to cross
section ‘B-B’
64 mm
(2.5")
5/16-18 UNC
set screw, note 3
( by customer )
pulley
shaft
25 mm
(1")
DETAIL ’A’
see DETAIL ’A’
and note 3
16 mm (.630")
16.07 mm( .633" )DIA.
angle iron
(by customer)
’B’
’B’
angle iron
127 mm
(5") approx. secure with
hook or bolt
anti-rotation spring
CROSS SECTION ’B-B’
arresting bracket
MD - 2000A SERIES PULLEY MOUNTING
MD-2000A
or
MD-2000A SS
spring
NOTE :
1. Machining on tail pulley shaft per Detail ’A’ (by customer) to accomodate Milltronics speed sensor .
2. Arresting bracket is an anti-rotation device only and must not secure or support the speed sensor. Bearing life would
be greatly reduced if speed sensor is not free to "float". Use anti-rotation spring to prevent mechanical oscillation of
speed sensor.
3. Grease mating surfaces to prevent seizing.
View for
direction
of rotation
PL-361 7

ITEM DESCRIPTION QTY.
1Enclosure 1
2 Enclosure Arresting Bracket 1
3 Encoder 1
4 Speed Sensor Card 1
5 Encoder Arresting Bracket 1
6 Bearing Assembly 1
7 Standoff 3
8 Threaded Plug, 1/2 NPT 2
9 Hex Bolt, 5/16 - 18 x 1 1/4 2
10 Bind. Screw, 6 - 32 x 5/16 8
11 External Lockwasher #6 8
12 Gasket, Bearing Assembly 1
13 Gasket, Cover 1
MD - 2000A PARTS IDENTIFICATION
P15 (RED)
CW (WHT)
CCW
(BLU)
GND (GRN)
COM
(BLK)
1
2
3
4
5
22
9
6
21
20
12
1011
15
1
13
17 18 19
3
4
711
5
1011
8
2
23 24 25
8
1110
2616
14
COVER NOT SHOWN FOR CLARITY
Bearing Assembly Replacement
- turn supply power from integrator off
- remove cover #18
- disconnect wires to terminal block 1TB
- remove speed sensor from mounting
- remove speed sensor card screws #10 & #26 and card #4. Leave encoder cable connected to card.
- remove the four bearing assembly mounting screws #20 located externally around shaft
- pull out bearing assembly #6 c/w card, encoder and mounting brackets
- loosen hex screw in shaft and remove encoder arresting bracket fastening screws #10
- remove encoder #3 and c/w arresting bracket #5
- remove bracket fastening screws #10 and bracket #15 from bearing assembly
- bearing assembly is now free
ITEM DESCRIPTION QTY.
14 Spring Spnr. B-604 1
15 Bracket 1
16 Cable Clamp 1
17 Round Head Screw 1/4 - 20 x 3/4 4
18 Enclosure Cover 1
19 Lockwasher, 1/4" 4
20 Flat Screw, Socket, 10 - 32 x 3/4 4
21 Lockwasher, Cntrsnk tooth #10 4
22 Hex Nut, 6 - 32 3
23 Hex Nut, 5/16 - 18 2
24 Split Lockwasher, 5/16 2
25 Flat Washer, 5/16 2
26 Round Screw, Slot, 6 - 32 x 3/8 2
PL-361 8

ITEM DESCRIPTION QTY.
1Enclosure 1
2 Enclosure Arresting Bracket 1
3 Encoder 1
4 Speed Sensor Card 1
5 Encoder Arresting Bracket 1
6 Bearing Assembly 1
7 Standoff 4
8 Cable Connector 1
9 Hex Bolt, 5/16 - 18 x 3/4 SS 2
10 Screw, 6 - 32 x 5/16 9
11 External Lockwasher #6 9
MD - 2000A SS PARTS IDENTIFICATION
COVER NOT SHOWN FOR CLARITY
9 19 20
8
3
2
15
510 11
16 17
6
12
10 11
22
21
4
18117
13
14
1110
1
P15 (RED)
CW (WHT)
CCW
(BLU)
GND (GRN)
COM
(BLK)
1
2
3
4
5
10 11
Bearing Assembly Replacement
- turn supply power from integrator off
- open cover
- disconnect wires to terminal block 1TB
- remove speed sensor from mounting
- remove speed sensor card screws #10 & #15 and card #4. Leave encoder cable connected to card.
- remove the four bearing assembly mounting screws #16 located externally around shaft
- pull out bearing assembly #6 c/w card, encoder and mounting brackets
- loosen hex screw in shaft and remove encoder arresting bracket fastening screws #10
- remove encoder #3 and c/w arresting bracket #5
- remove bracket fastening screws #10 and bracket #14 from bearing assembly
- bearing assembly is now free
ITEM DESCRIPTION QTY.
12 Gasket, Bearing Assembly 1
13 Spring Spnr. B-604 1
14 Bracket 1
15 Cable Clamp 1
16 SS Socket Screw 10 - 32 x 1/2 4
17 Lockwasher, Split #10, SS 4
18 Hex Nut, 6 - 32 4
19 Hex Nut, 5/16 - 18, SS 2
20 Split Lockwasher, 5/16, SS 2
21 Flat Washer, 5/16, SS 2
22 Round Screw, Slot, 6-32 1
PL-361 9

NOTE: Terminal block 1TB provides customer connection to integrator.
Refer to associated integrator manual for interconnecton wiring.
ref. 10D775 rev.0
to associated
integrator
1TB
1CN
BLACK
GREEN
ENCODER
B
A
COM
IN
OUT
COMINOUT
BLUE
OV
RED
P5V
750-10K
J2
J1
R9
10K R10 10K
GRN
BLK
RED
P5V
RP3 R5
10K
UNUSED P5V
C6
.1MFD
C5
.1MFD
GND
BLU
CCW
D COM
WHT
CW
P15V
4
P15V
1
P5V
P15V
D1
1N5060
C2
1MFD
C1
1MFD
P5V
RP2
750-10K
RP1
750-10K
RP1
750-10K
P5V
RP3
750-10K
P5V
IC3
MC34064
5
3
2
IC2
74HCT32
9
10 8
IC2
74HCT32
1
23
R7
10K
Q1
2N4401
R3
10K
R4
499
P5V
P5V
R1
499 R2
10K
Q2
2N4401 R6
10K
IC2
74HCT32
4
56
COM
V+
IC4
68HC11A1 48
23
COM
V+
IC2
74HCT32 14
7
IC2
74HCT32
12
13 11
RP1
750-10K
RP1
750-10K
P5V
J3
RP3
750-10K
RP1
750-10K
CR1
8MHZ
R8
10M
C4
27PF
C3
27PF
IRQ
XIRQ
MODA
MODB
PA0
PA1
PA2
PA3
AS
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PA4
PA5
PA6
PA7
PD0
PB0
PB1
PB2
PB3
PD1
PD2
PD3
PD4
PD5
PE0
PE1
PE2
PE3
PB4
PB5
PB6
PB7
VRL
VRH
EXTAL
XTAL
E
R/W
RST
IC4
68HC11A1
41
40
25
24
8
7
6
5
4
3
2
1
42
43
44
45
46
47
17
18
19
20
29
30 39
28
27
22
21
9
10
11
12
13
14
15
16
38
37
36
35
34
33
32
31
26
MD - 2000A SERIES SCHEMATIC
PL-361 10

MD - 2000A LOGIC DIAGRAMS
CW & CCW operation
clockwise counterclockwise
IC2 pin 6
IC2 pin 11
IC4 pin 4
IC4 pin 3
1TB 2
Speed Out
CW
1TB 3
Speed Out
CCW
PL-361 11

Siemens Milltronics Process Instruments Inc.
1954 Technology Drive, P.O. Box 4225
Peterborough, ON.Canada K9J 7B1
Tel: [phone] Fax: [phone]
www.milltronics.com
Siemens Milltronics Process Instruments Inc. 2002
Subject to change without prior notice
Printed in Canada
c
*7ml19981ec01* Rev. 1.0