Emerson FX-316 | Positioning Servo Drive for DX-316 Motors

Description

• Brand: Emerson Motion Control
• Full Model Number: FX-316
• OEM Part Number: 960132-01
• Lifecycle Status: Discontinued / Legacy
• Core Function: Positioning servo drive / amplifier for compatible DXM/E-316 motors
• Top 3 Technical Specs: 230 VAC input; 4 A continuous amplifier current; 4,000 RPM maximum with DXM/E-316 motor
• Additional Key Data: 16 lb-in continuous / 32 lb-in peak torque; 32 built-in indexes; optically isolated RS-423 serial interface compatible with RS-232C/RS-422
• Stock & Condition: Physical inventory subject to live confirmation; New Surplus or Tested Refurbished; QC release before shipment

Supply Chain & Technical Deep Dive

Legacy motion systems create a different procurement problem: the drive may be obsolete while the machine, motor, feedback wiring, and mechanical transmission remain fully serviceable. Emerson FX-316 is a positioning servo drive in the 230 V FX family, with OEM documentation identifying the compatible DXM/E-316 motor and a continuous amplifier current of 4 A. The same specification table gives 16 lb-in continuous torque, 32 lb-in peak torque, and 4,000 RPM maximum speed for the FX-316/DXM/E-316 combination. The FX platform also provides 32 basic indexes, allowing stored motion sequences to remain within the drive rather than requiring a replacement PLC solely for index storage.

The economic case is mainly preservation of an existing motion architecture. Replacing the complete servo system can involve motor selection, resolver wiring, mechanical coupling checks, control logic changes, commissioning, and production downtime. A matching FX-316 avoids those changes where the installed motor and interface remain within the documented specification. The drive provides an optically isolated serial interface using RS-423 signaling compatible with RS-232C and RS-422, with baud rates from 110 to 19.2 kbaud. Its basic I/O consists of eight optically isolated inputs and four outputs, with 10.5 to 30 VDC input signaling and outputs rated up to 200 mA at 30 VDC.

Migration, Compatibility & Field Traps

Replacement Matrix

Field Traps — Watch Out

Motor and feedback mismatch: FX-316 is not a universal servo amplifier. Emerson’s specification table pairs it with the DXM/E-316 motor and defines the associated torque and speed values. The resolver cable for FX-316/DX-316C is specified as ECF-XXX, while the motor cable is ECM. Verify motor model, resolver wiring, and cable part number before replacement.

Power sequencing and restart delay: Emerson’s installation guidance states that power should remain off for at least 10 seconds before reapplication. When logic and bridge AC power are wired separately, logic power must be applied before bridge power. The manual also lists a typical 10 A AC line current and 16 AWG minimum wire gauge for FX-316 installations using less than 50 feet of line wiring.

Resolver connector security: The ECF feedback cable uses a 9-pin D connector at the amplifier, and Emerson specifies that the connector must be screwed down. The same guidance gives a minimum cable bend radius of 10 times the cable outside diameter.

Thermal derating: Emerson specifies amplifier operation from 0°C to 45°C and states that available torque should be reduced by 1% per °C above 30°C. Cabinet ventilation therefore needs to be checked before approving a replacement that will operate near the upper temperature range.

Emerson FX-316

Quality Assurance & Testing SOP

Supplier Pre-Shipment QA Protocol

• OEM anti-counterfeit visual inspection: Verify Emerson Motion Control markings, FX-316 identification, OEM part number 960132-01, serial information where present, connector layout, terminal labeling, and enclosure condition.
• Mechanical inspection: Check the chassis, mounting points, terminal strip, connector shells, cooling surfaces, and covers for impact, corrosion, contamination, or evidence of unauthorized modification.
• Power-input inspection: Verify the AC input terminals and internal fuse-related interfaces against the FX-316 configuration before controlled energization.
• Power-on self-test (POST): Apply controlled power and verify the front-panel eight-segment diagnostic LED behavior documented by Emerson. For units or associated systems that expose explicit ERR/RUN status indicators, record the expected ERR/RUN state as part of the test record; do not assume that nomenclature on a later or modified assembly is identical to the original FX-316.
• Resolver feedback test: Connect the specified resolver interface and confirm stable feedback acquisition with the compatible motor/test fixture.
• Servo output test: Operate the amplifier under a controlled motor load and verify commanded direction, acceleration, deceleration, and stable servo operation within the applicable current limits.
• I/O load testing: Exercise representative digital inputs using 10.5 to 30 VDC signals and verify the eight input channels. Test representative outputs with an external load while remaining within the 200 mA maximum per output and 30 VDC maximum limits.
• Indexing test: Load and execute representative stored motion indexes; the basic FX drive supports 32 indexes. Confirm correct sequence execution, velocity, distance, dwell behavior, and repeat count where applicable.
• Serial communication test: Establish communication through the optically isolated RS-423 interface using a compatible RS-232C/RS-422 signal setup and verify communication across a representative baud-rate configuration.
• Thermal run test: Operate the unit under controlled load long enough to detect abnormal heating, unstable feedback, overcurrent behavior, or intermittent faults.
• Final QC record: Record part number, serial number, tested motor/interface configuration, diagnostic status, I/O results, index results, communication results, and release condition.
• ESD-controlled packing: Protect the electronic assembly against ESD, shock, vibration, and moisture during storage and export packing.

Procurement-Driven FAQ

Is the Emerson FX-316 genuinely in stock and what is the cutoff for overnight shipping?
Physical quantity should be confirmed against the actual FX-316 / 960132-01 unit before an urgent order is released. For shutdown-critical procurement, confirm quantity, condition, QC status, packing completion, and carrier cutoff in writing. Current secondary-market records identify FX-316 as discontinued, so available surplus inventory can vary.

How do you guarantee the condition of obsolete or surplus FX-316 units?
Condition should be established through documented inspection and functional testing. The QC process should include OEM identification, mechanical inspection, controlled power-up, resolver feedback verification, servo operation, I/O load testing, indexing tests, and serial communication checks.

What are the warranty terms and return policies for defective units?
The exact warranty period and RMA conditions should be stated on the quotation and order documents for the unit supplied. For a defective-on-arrival claim, retain the FX-316 part number, serial information, installation conditions, fault code or diagnostic indication, and commissioning test results.

Are there firmware compatibility issues I should warn my engineers about?
The FX-316 is a legacy motion-control product, and the more important compatibility checks concern the stored motion parameters, compatible DXM/E-316 motor, resolver feedback, I/O wiring, and serial interface configuration. Before replacement, save the existing drive configuration and document the current motion parameters and index data.

Can an FX-316 replace another FX-series drive?
Not automatically. Emerson’s product specifications assign different current, torque, speed, fuse, and motor combinations across the FX family. FX-316 is specifically associated with the DXM/E-316 family in the documented performance table, so a different FX model should not be treated as an equivalent substitute without a complete electrical and motor compatibility review.