ABB Bailey IMTSA01 | Turbine Speed Adapter Module

The ABB Bailey IMTSA01 converts turbine speed sensor signals for INFI 90 controllers. This adapter module accepts inputs from magnetic pickups and proximity probes. You can use it for overspeed detection and speed monitoring applications. It conditions raw sensor signals into clean digital pulses for the DCS. Consequently, this module protects turbines from dangerous overspeed conditions.

Technical Specifications Overview

Parameter	Detailed Specification
Model	ABB Bailey IMTSA01
Category	INFI 90 Turbine Speed Adapter Module
Input Type	Magnetic pickup (MPU) or proximity probe (eddy current)
Input Voltage Range	0.5V to 60V AC (peak-to-peak)
Input Frequency Range	1 Hz to 10 kHz
Output Type	Square wave pulse (TTL level, 0-5V)
Output Frequency	Same as input frequency (1:1 ratio)
Trigger Level	Adjustable (0.5V to 5V via potentiometer)
Hysteresis	15% of trigger level (adjustable)
Number of Channels	1 (single speed input)
Response Time	Less than 1 millisecond
Operating Voltage	24V DC (nominal, 18V to 32V)
Power Consumption	80 mA (typical)
Dimensions (approx.)	125 mm x 90 mm x 30 mm
Weight	0.22 kg (220 grams)
Connector	Screw terminal block (removable)
Operating Temperature	0°C to 60°C

Functional Features and Signal Conditioning

The ABB Bailey IMTSA01 filters and shapes raw speed sensor signals reliably. You can adjust the trigger level using the onboard potentiometer for different sensors. The module provides optical isolation between input and output circuits. Furthermore, it includes a low-pass filter to remove high-frequency electrical noise.

This adapter module outputs a clean 5V square wave for the Bailey controller. The LED indicator flashes with each input pulse for visual verification. Additionally, the module detects sensor wire breaks and outputs a fault signal. You can mount it on a DIN rail near the turbine sensor.

Installation and Configuration Steps

First, mount the ABB Bailey IMTSA01 on a DIN rail inside your control cabinet. Next, connect the 24V DC power supply to the designated terminals. Then, wire your magnetic pickup or proximity probe to the input terminals. Finally, adjust the trigger level potentiometer while the turbine runs at low speed.

You must use shielded twisted-pair cable for the sensor input wiring. The module does not provide power for active proximity sensors. Therefore, you need an external 24V supply for powered probes. Always ground the cable shield at the module end only.

This speed adapter works perfectly for steam and gas turbine monitoring. It connects directly to ABB Bailey IMTSA01 compatible DCS input cards. You can also use it for overspeed testing during turbine commissioning. The module handles both low-speed turning gear and high-speed running conditions.