Avtron HS6M Anleitung Handbuch - Seite 3

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Viewing on oscilliscope: for Profibus DP, the transmit and receive

signal pairs should change state rapidly as the controller transmits

messages to the encoder and the encoder replies. Transmission

rates vary, but these messages can be extremely short and typically

require scope triggering to spot them.

For Profibus DP, ensure termination resistors are in place (or

switched on) at each end of the cabling system, and that no

termination resistors are in placed or activated in the middle of

the system. Remove the connections to the master controller and

all devices, or power down all devices. Measure the resistance

between the communication wires. The value should be ~1/2 of the

termination resistor value on the network. If the resistance is greater

than the limit, a termination resistor is missing from the network. If

the resistance is less than the limit, there are incorrect termination

resistors switched on or connected to the system.

CANOPEN TROUBLESHOOTING

For CANOpen: disconnect the power connection, then ensure there

are no short circuits between any of the signal or power wires or

shield.

Viewing on oscilliscope: for CANOpen the transmit and receive

signal pairs should change state rapidly as the controller transmits

messages to the encoder and the encoder replies. Transmission

rates vary, but these messages can be extremely short and typically

require scope triggering to spot them.

For CANOpen, ensure termination resistors are in place (or switched

on) at each end of the cabling system, and that no termination

resistors are in placed or activated in the middle of the system.

Remove the connections to the master controller and all devices,

or power down all devices. Measure the resistance between the

communication wires [Example CANOpen-measure between CAN_L

and CAN_H]. The value should be ~1/2 of the termination resistor

value on the network. For CANOpen, this value should be >50 ohms,

<65 ohms. If the resistance is greater than the limit, a termination

resistor is missing from the network. If the resistance is less than

the limit, there are incorrect termination resistors switched on or

connected to the system.

Some housing styles include a two-color diagnostic LED. Red

indicates an error, Green indicates run status. During normal

operation, the encoder LED should be continously green. Flash

patterns indicate activity as follows:

RED - Error

Flickering - (Autobitrate/LSS services are in process)

Blinking - Configuration error

Flash - CAN bus frame error

Flashes - CAN guard timing or heartbeat error

Flashes - Sync message timeout

Flashes - PDO message timeout

ON - CAN Controller is in bus off state

GREEN - Run

Flickering - (Autobitrate/LSS services are in process)

Blinking - Encoder is in preoperational mode

Flash - Encoder is in stopped mode

Flashes - Software download in progress

ON - Encoder is operating normally with no errors

Nidec-Avtron recommends the use of a simple no-cost debugging

tool such as PCAN View.

Ensure the device is set to the proper baud rate (connection cap, or

for units with no connection cap, via software)

Ensure the device is set to the proper node address (connection cap

or for units with no connection cap, via software)

The encoder will power-up in the pre-operational mode.

The message it will issue is:

ID: 0x07nn 0x00

If you cannot see this message, try power cycling the device.

Note that CANOpen units with a hardware connection cap are

typically set to 20K default baud rate. Not all master devices

support 20K, so the power-up message may not be displayed.

Check the baud rate and node address on the connection cap.

ANALOG TROUBLESHOOTING

For analog output, a multimeter can be used to measure the output

signal. Disconnect the encoder outputs (but maintain the power

connection) to ensure no interference from field wiring and measure

the output voltage or current directly at the encoder depending

on the output style selected. Rotating the shaft should produce a

change in output value.

For analog output: If the output is within the expected range

but does not seem to change, the analog value may have been

accidently scaled to a tiny fraction of a revolution or such a huge

number of turns that the output change cannot be detected.

Connect both Set End Point 1 and Set End Point 2 to +Vs for 1

1 second or more, then connect them to ground or no connection.

The encoder will be reset to use the full scale factory default with

the output and position set to the mid-point of the full scale. Now

monitor output voltage or current while rotating. You should observe

a voltage or current change. Now follow the instructions in the

analog section to properly reset the analog minimum and maximum

values.

HS6M