Haas Technical DocumentationEffective Date:

Spindle - Motor - Encoder - Replacement

Spindle - Motor - Encoder - Replacement

January, 1987 - March, 2008

INSTALLATION

Issue:Replacement of optical motor encoder with a magnetic motor encoder.

Overview:Please use this document to remove or replace an optical encoder.

Resolution:Please read this section in its entirety before attempting to remove or replace the encoder.

Call your service representative to order the appropriate adaptor cable for your new encoder.

1. Turn machine power on. Move the spindle head to a position that

will allow you to easily work on the top of the spindle motor. Turn the

machine off.

2. Remove the necessary sheetmetal to gain access to the spindle

encoder.

3. Remove the encoder connector from the encoder and connect the

adaptor cable (P/N 33-10038) to it.

4. Remove the screws holding the encoder to the mounting bracket.

Remove the encoder, leaving the belt on the pulley at the orient

ring.

NOTE: If the unit has TSC, removal of the encoder mounting bracket may be necessary.

5. Inspect the belt and replace if necessary.

NOTE: Handle the new encoder with care; it is susceptible to damage.

NOTE: No pulleys will be shipped with the new encoder. Your service representative will supply required pulleys (table on next page).

1. Replace and tighten the mounting bracket screws to install the new

encoder to the mounting bracket. When installing pulleys, be sure to

apply Loctite to the setscrew and encoder shaft.

2. Apply tension to the belts. Belt tension is very critical, do not create

excessive tension. The maximum radial load (side load) for the encoder

shaft is 13 1/2 lbs (60 N). Exceeding this may damage the encoder.

Some machines have an automatic belt-tensioning bracket. Allow the

bracket springs to properly tension the belt and then tighten the screws.

3. Remove top of encoder, exposing encoder circuit card. Connect

adaptor cable to encoder circuit card and replace the top of the encoder.

NOTE: Push cable into notch on cap before tightening it down. Be careful to not

pinch the cable.

4. Coil the excess cabling to the encoder and secure it neatly in an out-

of-the-way place, being sure to immobilize the connectors.

5. Replace the sheet metal previously removed.

6. Change parameter values as described in the following section.

7. Perform the spindle orientation procedure.

AdaptorCable

AdaptorCable

Connector

REMOVAL

MagneticEncoder

Bracket

EncoderConnector

Adaptor

EncoderConnector

OpticalEncoder

Bracket

© Copyright 2015 by Haas Automation, Inc. No unauthorized reproduction. Page 1 of 2

Parameter ValuesThese parameter changes are required when replacing a non-magnetic encoder with a magnetic encoder.

Run Parameter Checker, if possible, to verify the machine’s current parameter settings. If a parameter has a

value of zero, do not change it.

Parameter UsageWhen replacing a mill spindle encoder, or the encoder on a lathe with a single encoder, change parameters

79, 182, 186, 187 and 239. If a lathe has two encoders, when replacing a lathe spindle encoder, change pa-

rameters 79, 239, 182 and 186. When replacing a lathe motor encoder, change parameter 187. When replac-

ing a lathe sub spindle encoder, change parameters 540, 544, 545, 570 and 571. All parameters are to be

changed in accordance with the tables shown below.

Encoder Pulley Machine

20-0042 HS Series

20-0179 EC Series, ES-5, VF (50T), VFSS, VM, VS,

SL-20/30/40 (motor), TL-25APL (motor)

20-0975 TL-1

20-1295 SL-30L/40L (spindle), SL-40 (spindle),

TL-25APL (spindle), TL-3

20-3323 OM-1/2

54-0107 GR Series (5K-GR)

54-0241 EC-630

54-3090 GT-20, SL-10, TL-2

54-7127 GR Series (complete), GT-10, MDC-500, MM, SMM,

TM, VF-1/2/3/4, VF (40T), VR

Parameter 79

SPINDLE STEPS/REV

Existing New

1000 1024

2000 2048

4000 4096

8000 8192

20000 20480

Parameter 239

SPNDL ENC STEPS/REV

Existing New

4000 4096

8000 8192

Parameter 186

Sp DECELERATION

Existing New

15000 15360

16000 16384

20000 20480

27200 27852

28000 28672

40000 40960

46000 47104

48000 49152

55000 56320

60000 61440

75000 76800

80000 81920

90000 92160

95000 97280

100000 102400

115000 117760

120000 122880

125000 128000

150000 153600

185000 189440

200000 204800

240000 245760

250000 256000

300000 307200

320000 327680

350000 358400

450000 460800

499999 511998

Parameter 187

Sp MOT HI GEAR ST/REV

Existing New

2000 2048

2667 2731

3000 3072

3975 4070

4000 4096

4080 4177

4770 4884

4990 5109

5000 5120

7000 7168

8000 8192

Parameter 182

Sp ACCELERATION

Existing New

20000 20480

60000 61440

200000 204800

400000 409600

500000 512000

800000 819200

1000000 1024000

1500000 1536000

1600000 1638400

2000000 2048000

4000000 4096000

Parameter 571

SUBSPIN ST/REV

Existing New

4000 4096

8000 8192

Parameter 570

SUBSPIN ENC ST/REV

Existing New

4000 4096

8000 8192

Parameter 540

Ss ACCELERATION

Existing New

1000000 1024000

2000000 2048000

Parameter 544

Ss DECELERATION

Existing New

400000 409600

1000000 1024000

Parameter 545

Ss HIGH GEAR STEPS/REV

Existing New

4000 4096

8000 8192

© Copyright 2015 by Haas Automation, Inc. No unauthorized reproduction. Page 2 of 2