ABB YPH108B Speed Measuring Board

The ABB YPH108B, also cataloged as the YPH108B Speed Measuring Board, operates as a dedicated hardware component for speed signal acquisition and analog frequency-to-value processing within ABB drive and control platforms. Configured to accept 0-20 mA active current inputs and 4-20 mA passive analog sensor signals, the board provides integrated signal conversion with overload and open-circuit diagnostics.

Hardware Specifications

Deterministic Network Backplane and System Signal Integrity

The YPH108B speed measuring board conditions analog frequency and tachometer inputs to preserve backplane bus communication velocity across connected controller racks. Onboard current-limiting resistor networks maintain an input impedance of approximately 330 ohm, ensuring stable signal loop conversion without loading field transmitters.

Designed for full firmware flash compatibility with supporting ABB drive software platforms, the module includes continuous loop fault detection logic. Integrated diagnostic circuitry identifies open-circuit conditions and signal overloads, driving local status LEDs while asserting fault flags over the system backplane interface.

Frequently Asked Questions

Q: What current signal formats are supported by the YPH108B current input channels?

A: The board supports both 0-20 mA signals from active current sources and standard 4-20 mA loop inputs from passive analog transmitters.

Q: How are field wiring fault conditions indicated locally on the YPH108B board?

A: The onboard green LED indicates normal operational status, while the red LED illuminates upon detection of open-circuit or loop overload conditions.

Q: What is the nominal input impedance for the analog input channels on the YPH108B?

A: The analog current input channels feature an internal input impedance of approximately 330 ohm.

Field Installation Guidelines

• Disconnect primary 24 VDC auxiliary power feeds and loop inputs before installing or removing the YPH108B board.
• Wear a grounded anti-static wrist strap to protect onboard surface-mount components from electrostatic discharge.
• Mount the board onto its card guides or standoffs, securing all retaining screws to establish low-impedance earth ground pathing.
• Ensure field transmitter signal lines are connected using twisted-pair shielded cabling to prevent electromagnetic noise coupling.
• Terminate line shielding at the designated enclosure earth stud, avoiding double-ended ground loops along the signal path.