8901 E. PLEASANT VALLEY ROAD • INDEPENDENCE, OHIO 44131-5508
TELEPHONE: (1) 216-642-1230
•
FAX: (1) 216-642-6037
E-MAIL: tachs@nidec-avtron.com
•
WEB: www.avtronencoders.com
Nidec-Avtron Makes the Most Reliable Encoders in the World
Encoder
Instructions
M3-3 thru M3-9
M3-A thru M3-J
HOLLOW SHAFT
DESCRIPTION
The Avtron Model M3-3, M3-4, M3-5, M3-6, M3-7, M3-8,
M3-9, M3-A, M3-B, M3-C, M3-D, M3-E, M3-F, M3-G, M3-H, and
M3-J Hollow Shaft Encoders are speed and position incremental
transducers (also known as tachometers or rotary pulse generators).
When mounted to a motor or machine, their output is directly
proportional to shaft position (pulse count) or speed (pulse rate). The
M3 operates down to zero speed and can be used for both control and
instrumentation applications.
The M3 Hollow Shaft Encoders eliminate the need for shaft couplings,
adapter flanges, or accessory mounting faces. The unit employs a
hollow shaft and clamping collar to lock the encoder to the shaft. An
anti-rotation bracket prevents rotation of the encoder while allowing
for shaft end float.
The enclosures on all Model M3s help protect the internal components
from the entry of dust and liquids.
All M3s utilize a photoelectric sensing system. All M3s can be equipped
with one or two outputs. Each output is electrically independent and
totally isolated. For many applications this feature provides a running
spare output by simply interchanging the output connectors.
The outputs can be wired as single ended single phase, single ended
two phase (A,B), or differential (A Quad B). An auxiliary output is
available (C,C) at 1/4 the base PPR for instrumentation.
Refer to separate instructions for additional information on the shaft
grounding option.
INSTALLATION CONSIDERATIONS
The M3 hollow shaft encoder requires a minimum mounting shaft
length, a minimum clearance space, and a precise shaft diameter
tolerance for proper mounting. See the table on the back page for shaft
requirements by model.
The M3 standard flexible anti-rotation bracket will tolerate ± 0.1"
of shaft end float. For applications with larger movement, select
modification 003, torque arm mount.
CAUTION
Be careful not to damage clamping fingers during
handling. Do not tighten clamping collar before
installation onto motor shaft. Damaging clamping fingers
can affect the quality of installation.
NOTE
In some cases units are shipped with a protective plug in
the hollow shaft to help prevent damage. If it is present, it
must be removed prior to final installation.
INSTALLATION
Equipment needed for installation
Supplied:
1. M3 Encoder 7. Washer, Flat 1/4 (2)
2. Clamping Collar 8. Washer, Spring Lock 1/4
3. Anti-Rotation Bracket 9. Washer, Tooth Lock 3/8 (2)
4. Thread Locker (blue) 10. Nut, Hex 1/4-20
5. Screw, Button Hd., 11. Washer, Shoulder,
3/8-16 x .50 (2) Insulating
6. Screw, Socket Hd. Cap. 12. Washer, Flat, Insulating
1/4-20 x .62 13. Anti-Seize Compound
(copper)
Not Supplied:
5/32" Hex Wrench (T-Handle Style) (M3-B)
3/16" Hex Wrench (T-Handle Style) (M3-3, -4, -5, -A, -C, -F)
7/32" Hex Wrench (T-Handle Style)
1/4" Hex Wrench (T-Handle Style) (M3-6, -8, -9, -D, -G, -J)
5/16" Hex Wrench (T-Handle Style) (M3-7, -E, -H)
7/16" Wrench
Dial Indicator
M3 PART NUMBERS AND AVAILABLE OPTIONS
Model Bore Size
M3-
AB-
Adapters
C-
0- Non-Standard
3- 5/8" 7- 2 3/8"
A- 3/4" B- 12mm
4- 1" C- 16mm
5- 1 1/8" F- 25mm
8- 1 1/2" G- 48mm
9- 1 5/8" D- 52mm
6- 2" E- 58mm
J- 2 1/8" H- 60mm
without Plugs
with Flex. Conduit Adapter
with Plugs
Mounting
STG-
with Grounding
MS
K-
with Flex. Conduit
b
L-
with Plugb
M-
without Plug
Style
End of Shaft
Thru Shaft
End of Shaft
10 Pin Connector
b
Line Driver
1-
5 to 24 VDC
2-
5 to 18 VDC
3-
18 to 24 VDC
4-
5 to 24 V in,
5 V out
MS mini
S-
Baldor Twist
Lock on
3 ft. Pigtail
s
side exit
b
bottom exit
Output
Location
L-
Single output
left side
R-
Single output
right side
D-
Dual output
P-
with Plug
V-
without Plug
EPIC
PPR Connector Modifications
000-
240
256
360
480
500
512
600
1024
1200
2048
2500
None
003-
Torque Arm Mount
005-
-40° C Rating
008-
4.5" C-Face Mount
009-
Northstar Pinout
015-
Stainless Steel Shaft
016-
8.5" C-Face Mount
Connector
6 Pin MS
M940 replacement
D-
with Plug
b
5 Pin MS Conduit Box 3 ft. Flex. Cable
M737A replacement
E-
without Plug
FM727A replacement
HJ-
s
with Plug
without Plug
s
with Plug
s
s
N-
with color
coded leads
T-
with Terminal
Block
028-
12.5" C-Face Mount
W-
Sealed, Pigtail
X-
Sealed, Industrial
Connector without Plug
Z-
Sealed, Industrial
Connector with Plug
Optional:
Torque Arm
Fan Cover Mounting Kit
C-Face Mounting Kits
Clean machine shaft of any dirt and check for any burrs or damage.
Install the anti-rotation bracket to the back of the M3 using 3/8-16
screws and thread locker.
Remove screws from clamping collar, apply thread locker to screw
threads and reinstall. Place clamping collar loosely on the inboard
end of the shaft. Carefully slide M3 onto the shaft. DO NOT FORCE.
Encoder should slide on easily. After verifying M3 fit onto shaft, remove
M3, apply anti seize supplied to shaft and re-install M3 (see shaft
engagement).Tighten screws on clamping collar evenly until snug,
then firmly tighten. DO NOT USE A STANDARD RIGHT ANGLE WRENCH.
Use only a T-handle hex wrench or torque wrench with hex bit.
Secure free end anti-rotation bracket to frame. Use supplied insulating
hardware if necessary as shown. Adapter kits are available for NEMA
56C (A24492) and 8 1/2" (A24493) mounting faces.
Shaft Engagement
For end of shaft mounting applications:
See table on last page.
For shaft lengths greater than the maximum engagement allowed, end
of shaft mounting may still be employed by locating the encoder away
from the motor using a spacer between the motor and anti-rotation
bracket.
2) Verify that the M3 engagement with the motor shaft conforms
to the engagement rules on page 4. In general, maximizing
engagement will minimize housing movement.
3) Verify that the mounting shaft diameters conform to the rules
on page 4. Excessive housing movement occurs when the
clearance between the motor shaft and pulse generator shaft
allows the two center lines to miss match.
4) Loosen the clamping collar and rotate the motor shaft 180°
within the M3 hollow shaft sleeve.
5) Make sure the clamping collar is tightened equally on both
sides.
6) Move the split in the clamping collar over a solid portion of
the M3 shaft.
If excessive housing movement still exists after the above steps, it
may be necessary to physically bias the attitude of the encoder on
the motor shaft while the clamping collar is being tightened. Either
by eye or using dial indicators, note the position around the outside
diameter of the encoder that is most out of position from true while
turning the motor shaft slowly. With the motor shaft no longer turning,
loosen the clamping collar. While applying moderate force by hand
against the outside diameter of the encoder on the side opposite
where the out of true position was observed, retighten the clamping
collar. Several iterations may be necessary if the first attempt under
or over compensates. This method may be used to help compensate
for undersized shafts, shaft runout, bent clamping fingers, and other
problems.
WIRING INSTRUCTIONS
Corrective Action for Excess Housing Movement (Wobble)
The hollow shaft M3 design eliminates the potential for bearing and
coupling failures from misalignment, however, excessive housing
movement (wobble) may cause undesirable vibrations. The higher the
RPM, the more severe the vibration will be from housing movement.
In a typical installation a housing movement of 0.007" TIR or less (as
measured at the outside diameter of the main encoder body) will not
have an adverse effect. If excessive housing movement is detected in
the installation:
1) Check the shaft the M3 is mounted on for excessive shaft
runout. NEMA MG1 calls for 0.002" TIR or less.
SPECIFICATIONS
ELECTRICAL
A. Operating Power (Vin)
1. Volts ......................................See Line Driver Options
2. Current ..................................120mA, no load
B. Output Format
1. 1O/ Connector Options H & J
2. 2O/ (A & B) ...............................Connector Options E & F
3. 2O/ & Comp. ............................Connector Options A,B,C,M,L,K,V,P,
(A,A–, B,B–) ...............................N,T,W,X,& Z (differential line driver)
4. Marker ...................................All Options, 1/Rev, Gated with B low
@ and below 1200 PPR
5. ÷4 (C,C–) .................................Connector Options A,B,C,M,L,K,V,P,
N,T,W,X,& Z (differential line driver)
C. Signal Type ............................Incremental, Square Wave, 50 ±10%
Duty Cycle
D. Direction Sensing ..................O/ A leads O/ B for CW rotation as viewed
from the back of the tach looking at the
non-drive end of the motor.
E. Transition Sep. ......................15% minimum
F. Frequency Range ..................0 to 150,000 Hz.
G. PPR ........................................240, 256, 360, 480, 512, 600, 1024,
1200, 2048, 2500
H. See Line Driver Options
MECHANICAL
A. Shaft Inertia .......................... 0.08 to 0.23 oz. In.2
B. Acceleration ..........................5,000 RPM/Sec.
C. Speed ....................................5,000 RPM for all M3 models, except
those shown below
3,600 RPM for M3-6, M3-7, M3-D, M3-E,
M3-G, M3-H, M3-J
CAUTION
Be sure to remove power before wiring the encoder.
Be sure to ground the cable shield: It can be connected
to case ground at the encoder, or grounded at the
receiving device, but should not be grounded on both
ends.
The M3 can be wired for single phase, two-phase, either with or
without complements, with or without markers and with or without
complementary divide by 4. See connector options and wiring
diagrams below.
D. Weight ...................................6 lbs (2.7kg).
E. Starting Torque ......................1.5 to 20 oz. In.
F. Shaft Dia. Tolerance ..............See drawing on last page.
G. Shaft Engagement .................See drawing on last page.
ENVIRONMENTAL
A. Enclosure Rating ................... Sealed against dust and water ingress.
B. Operating Temp. ....................-20* to 85°C
*-40°C optional
LINE DRIVER OPTIONS
Output Options
1 2 3 4
Voltage Input (Vin)
Output High (Volts)
Output High
(milliamps)
Output Low (Volts)
Output Low
(milliamps)
Protection
Maximum Cable
Drive(Feet)
5-24 VDC 5-18 VDC 18-24 VDC 5-24 VDC
(Vin) -2 (typ) (Vin) -1 (typ)
80 (max.)
0.5 (typ) 0.5 (typ) 1 (max.) 0.5 (typ)
80 (max.)
Reverse Voltage,
Transient,
Short Circuit (high
& low)
1000 ft. @ 5 V
500 ft. @ 12 V
200 ft. @ 24 V
80 (avg.),
1500 (peak)
80 (avg.),
1500 (peak)
Reverse Voltage,
Transient,
Short Circuit (none)
2000 ft. 1000 ft. 1000 ft. @ 5 V
330 ohm
pull up
330 ohm
pull up
50 (avg.) 80 (max.)
Reverse Voltage,
Transient,
Short Circuit (low)
Reverse Voltage,
Short Circuit (high
5 VDC
80 (max.)
Transient,
& low)
For bidirectional operation of the encoder, proper phasing of the two
output channels is important. Phase A channel leads phase B channel
for clockwise shaft rotation as viewed from the anti-drive or accessory
end of the motor (M3 mounting end).
CORRECTIVE ACTION FOR PHASE REVERSAL
1) Remove Power.
2) Exchange wires on cable, either at encoder cable end, or at
speed controller end (but not both).
a) Single Ended 2 Phase Wiring (see wiring diagram)
Exchange A and B at the use end of the wires.
b) Differential 2 Phase Wiring (see wiring diagram)
Exchange either A with A in the phase A pair OR B with B
in the phase B pair but NOT both.
3) Apply Power.
4) Verify encoder feedback is correct, using hand rotation of
shaft, or jog mode of the speed controller.
WIRING DIAGRAMS
DIFFERENTIAL TWO PHASE WIRING APPLICATIONS
SIGNAL CODING TABLE
Interconnecting cables specified in the wire selection chart are based
on typical applications. Refer to the system drawing for specific cable
requirements where applicable.
Physical properties of cable such as abrasion, temperature, tensile
strength, solvents, etc., are dictated by the specific application.
General electrical requirements are: stranded copper, 22 thru 16
gauge (Industrial EPIC Connector options can use 14 AWG), each wire
pair individually shielded with braid or foil with drain wire, 0.05 uF
maximum total mutual or direct capacitance, outer sheath insulator,
1,000 ft. max. See Wire Selection Chart for some suggested cables.
NOTE
When using the industrial connector (“G”, “P”, “V”, “X”,
or “Z” options), the minimum wire size is 20 gage, and
20 gage (only) wire ends must be tinned with solder
before connection at the
screw terminals.
OPTION
“W” & “N”
BLACK
RED
GREEN
YELLOW
BLUE
GRAY
ORANGE
WHITE
BROWN
VIOLET
SINGLE ENDED TWO PHASE WIRING APPLICATIONS
OUTPUT
BOX
RED
BLUE
GREEN
BLACK
OPTION
“A” “B” “C”
“K” “L” “M”
A
B
D
G
E
H
C
I
F
J
(USE CONNECTOR OPTIONS “E” & “F”
FOR M737A REPLACEMENTS)
B
C
E
A
CABLE BELDEN 8723
OR EQUIVALENT
OPTION
“P” “V”
“X” & “Z”
1
6
2
7
3
8
4
9
5
10
+5 TO +24 VOLT S*
ØB
GROUND
ØA
COMMON
*(SEE LINE DRIVER OPTIONS)
OPTION
“T”
1
2
3
4
5
6
7
8
9
10
OPTION D
M940 REPLACEMENT
E
D
A
F
OPTION
“R” & “S”
F
D
A
H
B
J
C
K
not used
not used
OPTION
“A” “B” “C”
“K” “L” “M”
With Mod.
030
F
D
A
H
B
I
C
J
not used
not used
REF
SIGNAL
COM
+V
ØA
–
ØA
ØB
–
ØB
Z
–
Z
C
–
C
*(SEE LINE DRIVER OPTIONS)
SINGLE ENDED SINGLE PHASE WIRING APPLICATIONS
OUTPUT
BOX
RED
GREEN
BLACK
*(SEE LINE DRIVER OPTIONS)
(USE CONNECTOR OPTIONS “H” & “J”
FOR M727A REPLACEMENTS)
COMMON
+5 TO +24 VOLTS
SIGNAL
CABLE BELDEN 8771
OR EQUIVALENT
GROUND
+5 TO +24 VOLTS
= MARKER
= ØA ∏ 4
*
*
NOTES: Marker output for connector options “E” & “F” - Pin “D”
Marker output for connector options “H” & “J ” - Pin “C”
Avtron standard warranty applies. Copies available upon request.
Specifications subject to change without notice.
TYPICAL WIRE SELECTION CHART
for 18 AWG, multiple pair, individually shielded
ALPHA
6062C
6063C
6064C
6066C
2 PAIR
3 PAIR
4 PAIR
6 PAIR
BELDEN
9368
9369
9388
9389
COVER PLATE
SINGLE OUTPUT
36.00
(914.40)
36.00
MIN.
(914.40)
OPTION “S”
MS3112E12-10P
CONNECTOR
OPTION “W”
SEALED FLEX CABLE
3.63
(92.20)
3.29
(83.57)
1.63 (41.40)
1.890
2.50 (63.50)
(48.00)
0.16
(4.06)
1/2–14 NPT
1.574
1.968 (50.00)
(40.00)
4.19
(106.43)
OPTION “X” – SURFACE MOUNTED INDUSTRIAL CONNECTOR
OPTION “Z” – CONNECTOR W/ MATING PLUG
0.177 (4.50) DIA. – 4 HOLES
INSULATING WASHER DETAIL
FIBER SHOULDER WASHER
STEEL FLAT WASHER
LOCK WASHER
FIBER FLAT WASHER
ANTI-ROTATION
BRACKET
3 – DIMENSIONS IN PARENTHESIS ARE MILLIMETERS
2 – ALL DIMENSIONS ARE APPROX.
1 – WEIGHT: 6 LBS.
NOTES:
OUTLINE DRAWING
7.10 (180.34)
5.03 (127.76)
W/O PLUG –
OVER DUST COVER
0.56 (14.23)
1/2–14 NPT
OPTION “V”
INDUSTRIAL CONNECTOR
OPTION “P”
CONNECTOR W/ MATING PLUG
CONNECTOR
OPTION
E, H, & D
F, J, & K
0.50 (12.70)
FIBER FLAT
STEEL FLAT
M
L
WASHER
WASHER
DIMENSION
YY
5.62 (142.75)
5.44 (138.18)
WATERPROOF CONDUIT/
ANTI-ROTATION
BRACKET
4.45
(113.03)
3.50
(88.90)
AA DIA SHAFT
SHAFT COLLAR
OPTIONS “N & T”
1/2–14 NPT
ZZ
3.34 (84.84)
2.75 (69.85)
"""
"
PLUG FACE
ZZ
YY
(53.85)
OPTION “K”
1/2" FLEXIBLE METAL
MS CONNECTOR
SHAFT
OPTION
3
0.6250/0.6245 (15.8750/15.8623)
4
1.0000/0.9995 (25.4000/25.3873)
5
1.1250/1.1245 (28.5750/28.5623)
6
2.0000/1.9990 (50.8000/50.7746)
7
2.3750/2.3740 (60.3250/60.2996)
8
1.5000/1.4995 (38.1000/38.0873)
9
1.6250/1.6240 (41.2750/41.2496)
A
0.7500/0.7495 (19.050/19.037)
B
0.4724/0.4720 (12mm h6)
C
0.6299/0.6294 (16mm h6)
D
2.0472/2.0464 (52mm h6)
E
2.2835/2.2827 (58mm h6)
F
0.9839/0.9835 (25mm g6)
G
1.8907/1.8901 (48mm K6)
H
2.3630/2.3624 (60mm M6)
J
2.1250/2.1245 (53.975/53.9623)
2.74
(69.60)
2.18
(55.37)
1/4–20 X 0.62 (15.87) SOCKET HD CAP SCREW
WITH INSULATING WASHERS SUPPLIED
0.43 (10.92) – THRU SHAFT MODEL ONLY
(165.10)
V-SEAL
0.91
(23.12)
CC
BB
0.100 (2.54) MIN
CLEARANCE REQUIRED
5.36 (136.14)
4.10 (104.14)
STUB SHAFT
ENGAGEMENT
6.45 (163.83) – OPTION B
6.25 (158.75) – OPTION C
3.56 (90.43)
PLUG FACE
CLEVELAND, OHIO
CAUTION
RETURN TO FACTORY FOR REPAIR
WARRANTY VOID IF OPENED
2.12
OPTIONS “M, E, H, & D”
MS CONNECTOR ONLY
OPTIONS “L, F, & J”
CONNECTOR W/ MATING PLUG
AA BB CC
MOTOR SHAFT OD
DIMENSION
LENGTH
2.70 (68.58)
2.70 (68.58)
2.70 (68.58)
2.88 (73.15)
3.00 (76.20)
2.88 (73.15)
2.88 (73.15)
2.70 (68.58)
2.70 (68.58)
2.70 (68.58)
3.00 (76.20)
3.00 (76.20)
2.70 (68.58)
2.88 (73.15)
3.00 (76.20)
3.00 (76.20) 2.250/2.620 (57.150/66.548)
OPTIONAL –
THRU SHAFT MODEL
6.50
DIA
OPTION
A
OPTION “A”
MS BOX CONNECTOR ONLY
OPTION “C”
CONNECTOR W/ MATING PLUG
OPTION “R”
MS3112E12-10P BOX
CONNECTOR ONLY
OPTION “B”
1/2" FLEXIBLE METAL
WATERPROOF CONDUIT/
MS CONNECTOR
MIN/MAX ENGAGEMENT
1.500/2.000 (38.100/50.800)
1.500/2.230 (38.100/56.642)
1.500/2.230 (38.100/56.642)
2.250/2.500 (57.150/63.500)
2.250/2.620 (57.150/66.548)
2.250/2.500 (57.150/63.500)
2.250/2.500 (57.150/63.500)
1.500/2.230 (38.100/56.642)
1.500/2.000 (38.100/50.800)
1.500/2.000 (38.100/50.800)
2.250/2.620 (57.150/63.500)
2.250/2.620 (57.150/63.500)
1.500/2.230 (38.100/56.642)
2.250/2.500 (57.150/63.500)
2.250/2.620 (57.150/66.548)
2.12
(53.85)
EU DECLARATION OF CONFORMITY: The Model M3 Pulse Generator has been assessed and type tested against the following Harmonized European
Standards: EN 50081-1:1992, EN 50082-1:1998. The Model M3 has been found to be compliant with the requirements of EU Directive 89/336/EEC provided
that the following conditions are met: The electrical supply to the M3 must be within specified limits. The electrical supply must offer suitable protection
from voltage surges unless the application does not require such protection. On behalf of Avtron: Stephen L D’Henin, Certification Manager, Epsilon
Certification Service.
8901 E. PLEASANT VALLEY ROAD • INDEPENDENCE, OHIO 44131-5508
E-MAIL: tachs@nidec-avtron.com
Nidec-Avtron Makes the Most Reliable Encoders in the World
TELEPHONE: (1) 216-642-1230
•
FAX: (1) 216-642-6037
•
WEB: www.avtronencoders.com
Features and specifications subject to change without notice.
Avtron standard warranty applies. All dimensions are in inches (mm) approx.
REV. 06-22-15
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