Infranor SMT-BD2, Manual

SMT-BD2 

Chapter 7 – Fault finding

1 - SYSTEM FAULT 

 
If the red 

SYS

 led is lit when the amplifier is on, the logic board is off duty.  

ƒ

Check that the EPROM firmware memory is correctly plugged on the amplifier. 

ƒ

  Check for the possible presence of any conducting dust that may involve short-circuits on the amplifier logic 

board. 

2 - STORED FAULTS 

 
If a fault occurs on the amplifier, it can generate the detection of several other faults which are only a 
consequence of the original one. In order to simplify the diagnostic and the maintainance, the faults are displayed 
and processed with the priority described below. For safety reasons, the power must be turned off before 
cancelling some faults that require the handling of the amplifier or the connectors.  

2.1

-

"BUSY"

 FAULT

ƒ

  If the BUSY fault is continuously displayed after power on, the auto-test procedure has failed and the control 

board is not operating correctly.  

ƒ

If the BUSY fault is continuously displayed after the starting of the motor phasing procedure by 

CVO

 at power 

up (“incremental encoder ” configuration without HES) , the procedure has failed because of an external 
cause and the calculated phase value is wrong. Check that the 

Motor encoder resolution

 parameter value is 

correct. Check that the 

Motor parameters

 (

Pole pairs

 and 

Phase order

) values are correct. Check that the 

ENABLE

 input is activated. Check that the limit switches  inputs are not activated. Check that the motor is not 

locked and the shaft movement is free during the procedure execution. 

ƒ

If the BUSY fault is continuously displayed after the execution of the 

Auto-phasing

 procedure, the procedure 

has failed because of an external cause and the calculated parameters are wrong. Check that the 

Motor 

encoder resolution

 parameter value is correct. Check that the 

ENABLE

 input is activated. Check that the 

limit switches  inputs are not activated . Check that the motor is unloaded and the shaft movement is free 
during the procedure execution. 

ƒ

  If the BUSY fault is continuously displayed after the execution of the 

Auto-tuning

 procedure,  the procedure 

has failed because of an external cause and the calculated parameters are wrong. Check that the 

ENABLE

input is activated. Check that the limit switches  inputs are not activated. Check that the motor shaft 
movement is free during the procedure execution. 

ƒ

  If the BUSY fault is continuously displayed after the execution of the 

Offset compensation

 procedure, the 

offset is exc/- 0.3 Volts. Check for the voltage value on the analog speed input command CV during 
the procedure execution. Check that the input command wiring between controller and amplifier answers the 
requirements of 

chapter 4

 (CV at diff. low of the NC and 0 Volt cable). 

ƒ

  If the BUSY fault is continuously displayed after the execution of the 

Cogging torque acquisition

 procedure 

(for rotating motors), the procedure has failed because of an external cause and the cogging acquisition is not 
valid. Check that the 

ENABLE

 input is activated. Check that the 

CI

 and 

CV0

  inputs are not activated. Check 

that the limit switches inputs are not activated. Check that the encoder is providing one marker pulse per 
motor revolution. Check that the motor is unloaded and the shaft movement is free during the procedure 
execution. Check that  the motor current value corresponding to the cogging torque effect is lower than 5% of 
the amplifier current rating. 

ƒ

  If the BUSY fault is continuously displayed after the execution of the 

Linear Cogging acquisition

 procedure 

(for linear motors), the procedure has failed because of an external cause and the cogging acquisition is not 
valid. Check that the 

ENABLE

 input is activated. Check that the 

CI

 and 

CV0

  inputs are not activated. Check 

that the positive and negative motor travel limit switches are operating correctly. Check that the encoder is 
providing one marker pulse over the entire motor travel. Check that the motor is unloaded and the 
displacement is free during the procedure execution. Check that  the motor current value corresponding to the 
cogging force effect is lower than 5% of the amplifier current rating. Check that the motor travel distance (from 
the negative to the positive limit switch) is less than 4000000 encoder counting increments. 

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Chapter 7 - Fault finding