Magnetic Pickup Sensor Wiring
Original instructions
About us
Introduction
Use the BMXFTB2800 or BMXFTB2820 28-pin terminal blocks to connect the magnetic pickup sensors to the module.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH
  • Ensure that the turbomachinery is stopped while connecting or disconnecting the module or the terminal block.
  • Connect or disconnect the terminal block with sensor and pre-actuator voltage switched off.
Failure to follow these instructions will result in death or serious injury.
Input Signal Restriction
MPU interface cannot handle variation in signal level greater than 50% from pulse to pulse when configured in Sensitive mode. Air gap variation from tooth to tooth may lead the couple MPU/Gear providing such signal level variation even at constant metal speed. The Noisy mode must be selected in this case to detect the whole pulses.
WARNING
UNEXPECTED APPLICATION BEHAVIOR - INCORRECT INTERPRETATION OF INPUT DATA
Set the parameter MPU Input Mode to Noisy when the level variation detected by the MPU sensor is greater than 50% from tooth to tooth.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Sensor (MPU) Wiring
Wiring example for an MPU sensor on channel 1: 
1
Variable reluctance sensor 
2
Optional load
Optional Load
The differential input circuit is fully isolated and requires the outputs of the sensor to be free of potential.
When the built-in input impedance does not match with the characteristics of the MPU sensor, place an appropriate optional load as terminating impedance.
In case of inappropriate termination resistance, glitches or high voltage picks may appear in the frequency input signal.
WARNING
UNEXPECTED VALUE
  • Check that the optional load value is conform to the supplier recommendations.
  • Install the sensor in accordance to the supplier recommendation.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Precautions
Externally wire pin 13 (MPU0+) to pin 12 (MPU0-) and pin 17 (MPU1+) to pin 16 (MPU1-) if the application does not use magnetic pickup sensors: