Hello,

We are experiencing multiple alarms. The 840D sl controller is on our 3 axis vertical milling machine. It is a toolroom mill with a quill (Q axis, linear in control). The machine was running, was off for two days and then on start-up, these alarms were present.

The alarms are as follows:

3000 - Emergency Stop

25201 - Axis SP drive fault

231885 - Axis SP SERVO_3.3:3 (3) Component SM_16: Encoder 1 DRIVE-CLiQ (CU): Cyclic data transfer error. Component number: 16, fault cause: 33.

201482 - DP003.Slave003: SERVO_3.3:3 (3) Component SM_16: Topology: Comparison Sensor Module missing in the actual topology. Component number: SM_16.

201315 - DP003.Slave003: SERVO_3.3:3 (3) : Drive object not ready for operation.

SP SERVO_3.3:3 is the spindle, there is an incremental encoder which is connected to the SMC30 drive. The machine tool manufacturer suggested changing the encoder. I replaced the encoder, not the exact brand, but the specifications are the same.

Changing the encoder did not fix the issue. Here are the encoders:

Old encoder:

tamagawa, fa-coder, 48-1024c/t-l3-5v-ts5208

Replacement encoder:

https://www.automationdirect.com/adc/shopping/catalog/sensors_-z-_encoders/rotary_encoders/light_duty_incremental_encoders_(quadrature)/8mm_hollow_shaft_line_driver_(trd-sh_series)/trd-sh1024vd

SMC30 status LED's are as follows:

OUT>5V - LED off

RDY - LED Solid Red

Questions:

Does the SMC30 drive need to be replaced? Is there anyway to disable the encoder? There is not ATC on this machine and the spindle speed is not critical for the operations performed on this machine. I have tried turning MD30130[0], MD30240[0], and MD30200 to zero to try and disable encoder but this has not worked.

Hi,

I guess you have checked the connections.

I don't think you can disable the encoder because it is probably being used by the drive to control motor speed. You may be able to change the motor setup to run without an encoder but speed control will suffer.

the smc30 is not expensive so I would change it.

Pee

I checked the supplied voltage to the drive. It is 23.8 VDC. I checked the voltage being supplied to the encoder (out of drive). It is 4.5 VDC. I also checked all the wires in the cable for continuity. They are good. I ordered a new drive, but it is back ordered.

PISCEAN 2010

Hello Rgiovannani1103, 

1. Please check supply voltage of new encoder which you connected. From the provided description it looks like original encoder supply voltage is 5 Volt. SMC 30 encoder supply voltage i.e. 5 V or 24V is selectable via parameter which you need to set.

2. SMC30 5V LED is off - means either electronic power supply is missing or out of tolerance. Please check.

3. If you have replaced or modified encoder type, depending on topology setting you need to conduct identification. Please refer Replacement of S120 componenets topic for more details.

Hope this helps.