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The IMHSS03 Hydraulic Servo Module positions a hydraulic actuator in manual or automatic control through a servo valve or I/H converter. It combines LVDT feedback, servo drive, hard-manual contacts and local diagnostic functions for turbine and process-valve control.
The IMHSS03 Hydraulic Servo Module positions a hydraulic actuator in manual or automatic control through a servo valve or I/H converter. It combines LVDT feedback, servo drive, hard-manual contacts and local diagnostic functions for turbine and process-valve control.
02
Technical Specifications
01LVDT feedback inputs
4 analog secondary inputs for two LVDTs, two secondaries per LVDT
02LVDT input rating
24 V peak-to-peak; ±7 VDC common mode; 10 kΩ differential input impedance
03LVDT excitation outputs
2 analog primary outputs
04Excitation frequency
400 Hz to 15 kHz
05Servo coil outputs
4 total; two redundant selectable outputs with protection
06Servo output selections
±8, ±16, ±24, ±32, ±40, ±48, ±56 or ±64 mA, matched to the documented coil impedance
07I/H output
4 to 20 mA into 300 Ω maximum, or 20 to 160 mA into 15 Ω maximum
08Position meter output
4 to 20 mA into 300 Ω maximum
09Unscaled feedback output
2 mA into 5 kΩ minimum
10Test output
1 mA into 5 kΩ minimum
11Contact inputs
3 optically isolated 250 VDC inputs for raise, lower and trip bias
One Module Mounting Unit slot; single printed circuit board
18Front indicators
9 LEDs
19Operating temperature
0 to 70°C (32 to 158°F)
20Humidity
5 to 90% RH to 55°C; 5 to 40% RH above 55°C, noncondensing
21Altitude
Sea level to 3 km (1.86 mi)
22Environment
Noncorrosive; IEEE-472 surge withstand stated in the manufacturer manual
03
Compatibility & Replacement
01
Original-System Compatibility
Used with INFI 90/Harmony rack controllers, commonly an IMMFP01/02/03, and normally paired with an IMFCS01 frequency counter for turbine governor applications. Manufacturer documentation lists NTHS03, NIDI01/NTDI01, NKAS02 and NKHS03 among the associated termination and cable hardware.
02
Historical Replacement
ABB identifies SPHSS13 as the direct replacement for IMHSS03. Even for a direct replacement, verify the installed LVDT type, coil current, termination, cable set, controller firmware and function-code configuration before work.
04
Applications & Fault Scenarios
Steam-turbine throttle and control valves, gas-turbine fuel valves, inlet guide vanes and nozzle-angle positioning.
Closed-loop hydraulic actuator positioning with AC or DC LVDT feedback and servo-valve or I/H drive.
Maintenance searches commonly follow LVDT excitation loss, missing secondary feedback, coil open/short conditions, actuator drift, hard-manual transfer or controller communication faults.
A servo-loop failure can force a valve to manual or trip strategy and may stop a turbine or keep it unavailable after an outage.
05
Redundancy & Control
The redundant servo outputs may operate as two active outputs or in an active/standby arrangement.
A short or open circuit on one protected servo output does not affect the other output.
Automatic demodulator-gain features support AC and DC LVDT applications; the configured actuator and feedback topology must be preserved during replacement.
06
Configuration & Installation
Confirm function code FC55 or FC150, coil-current selection, LVDT excitation, feedback polarity and hard-manual wiring against the unit database.
Record every switch, jumper, cable, termination point and calibration value before removal.
The module must be matched to the hydraulic actuator and servo valve; a correct part number alone does not replace commissioning checks.
07
Diagnostics & Maintenance
Offline firmware diagnostics use the front LEDs for pass/fail and test identification. Do not place a live control loop into diagnostic mode without an approved outage procedure.
Manufacturer checks include memory, communication and feedback functions; loss of LVDT primary voltage below the documented threshold or missing secondary feedback can indicate a loop fault.
Remove dust every three months, inspect signal, power, ground and connectors every 12 months, and calibrate the LVDT/actuator loop as required. Complete all items during a shutdown when possible.
01How should IMHSS03 be installed in a turbine-control loop?
Record the function-code data, coil-current range, LVDT wiring, termination, cable positions and calibration before removal. Install only under an approved turbine outage or bypass procedure and complete a controlled valve-stroke test before service.
02Can SPHSS13 replace IMHSS03 directly?
ABB identifies it as the direct successor. The engineering team should still verify controller firmware, function code, LVDT arrangement, servo-coil current, cable and termination details before the exchange.
03What must be configured on IMHSS03?
Match the selected control function, LVDT excitation and polarity, servo or I/H output range, hard-manual contacts and actuator calibration to the existing valve loop.
04How should IMHSS03 be maintained and protected from ESD?
Use grounded ESD controls and antistatic packaging. Follow the cabinet cleaning and annual connection checks, and calibrate the LVDT/actuator loop when required. Offline diagnostics must only be run under a safe operating procedure.
05What delivery and warranty support is available for IMHSS03?
Each unit is function-checked where suitable test facilities are available and packed in an antistatic bag with protective cushioning. DOA, return and exchange requests are handled under the written order terms after evidence and technical evaluation. Warranty covers confirmed supply defects during the agreed period, excluding misuse, incorrect installation, ESD damage, improper storage and unauthorized repair.
06What information is needed for an IMHSS03 RFQ?
Please provide the Part Number, Quantity, Destination, Required Date and Machine/System Model. Include the controller, function code, termination, LVDT type and servo-coil current when possible.
Technical statements are limited to verified ABB/Bailey manufacturer documentation. Installation must follow the plant safety procedure and the documentation for the installed system revision.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Trading Company
Year Established:
2004
Total Annual:
85682000-125000000
Employee Number:
70~80
Ecer Certification：
Verified Supplier
Company Profile
Amikon Limited specializes in the global supply of industrial automation module spare parts.The company focuses on well-known international brands covering DCS systems, robot control systems, and large-scale servo control systems.
Product scope includes:
➢Distributed Control Syste... Company Profile
Amikon Limited specializes in the global supply of industrial automation module spare parts.The company focuses on well-known international brands covering DCS systems, robot control systems, and large-scale servo control systems.
Product scope includes:
➢Distributed Control Syste...
