AMCI SD17060B-03 Manuale d'uso - Pagina 17

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TROUBLESHOOTING

Motor Problems

Symptom

The motor has no holding

torque.

The SD17060B blinks its

FAULT

LED green when pulses

are applied to the driver, but the

motor only emits a high pitch

noise. It does not rotate.

The motor only runs in one direc-

tion.

The motor runs backwards. (CW

instead of CCW and/or CCW

instead of CW)

As its running speed increases,

the motor begins to run rough,

and eventually stops while

pulses are being applied.

The motor runs erratically.

As noted above, sometimes a problem that appears to be with the motor is actually a problem

with the indexer. The SD17060B has a Self-Test feature that allows you to verify motor opera-

tion without an indexer. With power applied to the driver, toggle the SB4-1 switch. The motor

will begin to rotate clockwise at 60 RPM. You must remove power to the driver to end the self

test. Please remember to return SB4-1 to its original position before cycling power to the driver.

20 Gear Drive, Plymouth Ind. Park, Terryville, CT 06786

Tel: (860) 585-1254 Fax: (860) 584-1973 http://www.amci.com

Solution

1) If the Step/Fault LED is red, then a problem exists with the driver or

motor. Refer to Power Connector and Indicator LED's on page 13

for information.

2) If the motor rotates when commanded but has no holding torque,

then your Idle Current Reduction switch is set to the To 0% setting.

This setting removes motor current when the driver is idle for more

than one second. There are other idle current reduction settings

available. See Switch Settings on page 9 for more information.

3) The SD17060B ships with the motor current set to its minimum

value of 1.0 amp. It's possible that it was not set for your applica-

tion. See Switch Settings starting on page 9 for the proper switch

settings.

STEP/

1) The acceleration or starting speed values may have been set too

high when the indexer was programmed. The motor may start to

accelerate and stall as the acceleration increases.

2) The Step Resolution may be set to a values lower than you are

expecting. For example, if the Step Resolution is set to 200 instead

of 400, the acceleration value is effectively doubled.

This problem is usually caused by the directional pulse inputs. If your

indexer is sending pulses in the CW/CCW format and the driver is con-

figured for the Step & Direction format, the motor will rotate counter-

clockwise when the driver receives CW pulses, and it will not rotate at

all when the driver receives CCW pulses. If the indexer is sending

pulses in the Step & Direction format and the driver is configured for

the CW/CCW format, the motor will only rotate clockwise, even when

the indexer is commanding a counter-clockwise move.

1) One of the motor phases may be reversed. The "quick fix" is to

reverse the connections on the ±B windings.

2) There may be a problem with the directional inputs. Either they are

wired incorrectly or the format is wrong. Check wiring and see the

previous problem for more information on problems with format.

1) If you are using single ended outputs for your pulse and direction

signals, you may have a problem with the outputs not switching fast

enough. See the note on the R

Indexer section on page 10.

2) You may have a problem with resonance in the system. Run the

system with the Anti-Resonance feature enabled and disabled to

see which give you better performance. The Anti-Resonance fea-

ture is set with SB1-5. See page 9 for more information.

1) The motor is not correctly coupled to the load.

2) The deceleration rate is set to high and the inertia of the load is car-

rying the motor past the point where it is supposed to stop.

3) You are performing a slow move, (under 1 revolution/second) while

the Step Resolution is set to 200 or 400 steps/turn. To correct this

problem, try increasing the indexer's starting speed parameter. Do

not increase the starting speed beyond your slowest running speed.

4) The motor current is set too low and the motor is unable to move

the load.

5) The motor is not correctly wired. Eight lead motors can be wired in

series or parallel. Series connection gives you more torque at lower

speeds and parallel connection gives you more torque at higher

speeds.

Resistor in the Connecting Your