Position Feedback Does Not Function; Actuator Is Not Switched Off By The Limit Switch In Direction Close; Actuator Stops Immediately After Having Started; Actuator Does Not Signalise Reference Operation, Connection Failure Position Transmitter Or Signal Interruption Position Transmitter - AUMA AM 01.1 Operation Instructions Manual

Operation instructions

15.2 Position feedback does not function

15.3 Actuator is not switched off by the limit switch in direction CLOSE

15.4 Actuator stops immediately after having started

15.5 Actuator does not signal reference operation, connection failure position transmitter or signal
interruption position transmitter

15.6 Measuring the Modbus signals using an oscilloscope

Example for correct Modbus signal:
Actuator controls AUMA MATIC AM/ AMExB/ AMExC
.
Check if the voltage at plug (X1) on the Modbus board, pin 3 (-) and pin 2
(+) is subject ot linear incrementation when running open and linear
decrement when running close.
The value for position CLOSED should be within the range of 0 to 2 V.
The value for position OPEN should be within the range of 3 to 5 V. The
voltage difference between CLOSED and OPEN should be superior to 3V.
The actuator is set to torque seating.
.
Set actuator to limit seating:
.
Set switch S4 (see figure H, page 44) on the Modbus board to position
'LIMIT'.
Adjust switch S1-2 on the logic board (see page 47) to position 1.
.
Set switch S2-2 (blinker transmitter) on the logic board to position 'ON'.
.
The position transmitter (potentiometer, RWG) is faulty.
.
.
Check position transmitter wiring and connection
Check the setting of parameter 1 "Position transmitter"
If the actuator is not equipped with a position transmitter, parameter 1 has
to be set to value 0 (no position transmitter)
On the Modbus board, the signal from Modbus channel 1 on the plug (X8
Modbus, refer to page 46) pin 1 (P/B) and pin 2 (N/A) can be checked using
a digital oscilloscope.
The off-load voltage between pin 1 (+) and pin 2 (-) must be positive and
within the range of 0.8 V and 1.4 V.
Example for incorrect Modbus signal
(Bus only terminated on one side):
Modbus
51