TRICONEX 3636R | 32 Point 125VACVDC Relay Output Module

Description

• Brand: Triconex / Invensys
• Full Model Number: 3636R
• System/Series Family: Tricon v9–v11
• Core Function: 32-point non-triplicated relay output switching for non-critical field loads
• Top 3 Hardcore Specs: 32 non-commoned outputs; 125 VAC/VDC maximum; 2 A maximum per point
• Relay Contact: Normally Open (NO)
• Minimum Permissible Load: 10 mA at 5 VDC
• Resistive Switching Power: 2,000 VA / 150 W maximum
• Maximum Output Cycle Rate: <30 cycles/s
• Expected Relay Life: >10,000 cycles at maximum rated load
• Output Fuse: 2.5 A fast-acting per point
• Point Isolation: 1,500 VDC minimum
• Logic Power: <10 W all outputs Off; <20 W all outputs On
• Diagnostics: Relay loopback diagnostics; module PASS / FAULT / ACTIVE monitoring
• Hot Spare: Supported
• Termination: Separate external termination panel with cable interface to Tricon backplane
• Stock Status: New Surplus or Fully Tested Refurbished; exact revision to be confirmed

Tricon documentation identifies Model 3636R as a non-triplicated Relay Output module with 32 non-commoned normally-open relay outputs. It is intended for non-critical points that are not suitable for high-side solid-state output switching.

Module 3: Technical Product Introduction

When a field device requires a dry-contact style interface rather than a high-side semiconductor output, the TRICONEX 3636R provides the relay stage. It contains 32 individually referenced, normally-open relay outputs and is classified by Triconex as a non-triplicated relay-output module for non-critical points. The three processor channels provide output commands to the module, where the information is voted before driving the individual relay circuits. A loopback circuit independently verifies relay-switch operation, allowing the system to detect certain latent output faults even without relying on the external load.

Electrical limits are straightforward but should not be interpreted as a universal load rating. Each point is rated up to 2 A, with a maximum field voltage of 125 VAC/VDC and a minimum permissible load of 10 mA at 5 VDC. Resistive switching capacity is specified at 2,000 VA and 150 W maximum, while reactive-load switching requires derating to 25% of the maximum, or 37.5 W for DC applications. Each output is protected by a 2.5 A fast-acting fuse, and the 3636R provides minimum point isolation of 1,500 VDC.

TRICONEX 3636R

Module 4: Application Scenarios & Field Realities

• For annunciator-panel interfaces, 3636R is a natural fit where the field circuit requires relay contacts rather than a direct solid-state output. Triconex specifically cites annunciator interfaces as an example of a non-critical application for the relay-output family.
• When switching auxiliary contactor, lamp, or indication circuits, the 32 non-commoned points allow separate field references at each output. This is useful in cabinets with mixed-voltage auxiliary circuits, provided every individual load remains within its voltage, current, switching-power, and fuse limits.
• For legacy Tricon cabinets undergoing maintenance, the relay loopback feature provides an important diagnostic layer. The module can verify relay-switch operation independently of the connected field load, so a field-circuit fault does not automatically have to be interpreted as a failed relay card.
• Where outputs drive inductive loads, the nominal 2 A figure can be misleading. Tricon documentation requires substantial switching-power derating for reactive loads, and incandescent lamps may produce inrush currents 10–15 times their nominal current. Actual load characteristics therefore need to be included in the engineering calculation.

Module 5: Migration, Compatibility & Installation Traps

Replacement Matrix

Replacement classification: Drop-in Replacement when the existing Tricon installation is configured for Model 3636R with the compatible external termination panel, field-voltage arrangement, and supported system configuration.

Software compatibility: Configuration verification required. No application firmware is stored on the relay contacts themselves, but output assignments, diagnostic handling, active/spare configuration, and the Tricon application remain part of the replacement procedure.

Cross-model replacement: Hardware and application verification required. The related 3636T has a different point-isolation rating, while other Tricon output families may use solid-state switches, different field voltages, commoning schemes, or different diagnostic architectures.

Field Traps — Watch Out

1. Do not confuse 3636R with a TMR relay output card. The module is classified as non-triplicated relay output. Although three processor channels provide voted commands to the module, the relay-output function itself is not a triplicated field-output architecture. It is intended for non-critical points.

2. Verify the actual load type before using the 2 A specification. A 2 A resistive load is not equivalent to a 2 A inductive load. Tricon’s guidance reduces allowable switching power to 25% of maximum for reactive loads, and high-inrush incandescent loads require their peak current to be included in the calculation.

3. Inspect the external fuse before condemning the module. Each output has a 2.5 A fast-acting fuse. An open fuse can interrupt a perfectly healthy relay contact, producing a field-side failure that originates outside the relay itself.

4. Match the termination panel and cable assembly. The 3636R requires a separate external termination panel connected to the Tricon backplane. The replacement process therefore includes the ETP, cable interface, field wiring, and fuse arrangement—not merely the front-panel module.

5. Verify relay-cycle duty. The specified maximum output cycle rate is below 30 cycles per second, and expected life is greater than 10,000 cycles at maximum rated load. A fast-cycling control loop can therefore have a very different maintenance profile from a simple status relay.

Module 6: Quality Assurance SOP

Pre-Shipment Inspection Protocol for TRICONEX 3636R

• OEM identity inspection: Verify Triconex/Invensys marking, exact 3636R designation, hardware revision, serial number, front-panel label, and additional assembly identifiers.
• Variant verification: Confirm the module is 3636R, not 3636T or another Tricon relay/output model.
• Mechanical inspection: Examine the enclosure, module guides, locking mechanism, relay-output connector, status LEDs, accessible PCB surfaces, and mounting interfaces for corrosion, contamination, deformation, cracked components, or unauthorized repair.
• Relay-contact inspection: Check accessible relay/output interfaces for contamination, oxidation, mechanical damage, or evidence of overheating.
• Termination inspection: Verify the external termination panel and cable interface intended for the installation; inspect terminals, fuse holders, and field connections before energization.
• Fuse verification: Confirm one 2.5 A fast-acting fuse per output and inspect for correct seating, continuity, discoloration, and thermal damage.
• Power-on self-test: Install the module in a compatible Tricon test chassis and verify PASS, FAULT, ACTIVE, and individual point indications.
• 32-channel verification: Exercise all 32 output points independently and record each result.
• Relay switching test: Operate every relay under a controlled low-voltage test load and verify clean normally-open contact closure and release.
• Contact resistance test: Measure relay contact resistance under an approved low-current test condition and record abnormal or unstable values.
• Load test: Apply representative resistive loads within the documented 2 A / 150 W limits and verify switching performance, voltage drop, and thermal behavior.
• Reactive-load verification: Where appropriate, test an approved representative inductive load using the documented derated switching-power limits rather than the full resistive rating.
• Minimum-load test: Verify representative operation at loads above the documented 10 mA, 5 VDC minimum permissible load.
• Loopback diagnostic verification: Exercise the relay loopback circuit and confirm that controlled relay faults are detected without relying on the external load.
• Fuse-fault simulation: Where the laboratory fixture permits, simulate an appropriately controlled fuse-open condition and verify the expected diagnostic response.
• TMR command-path verification: Where the test environment permits, validate all three processor command channels and confirm correct voted relay operation.
• Hot-spare test: Use a compatible active/spare Tricon arrangement and verify transfer behavior according to the approved maintenance procedure.
• Cycle-duty test: Operate representative relay channels at an appropriate controlled cycle rate and inspect for contact bounce, welding, sticking, excessive heating, or diagnostic instability.
• Isolation verification: Perform an approved controlled isolation test against the 1,500 VDC minimum point-isolation specification for the 3636R.
• Thermal observation: Run representative multiple-channel loads for an extended interval and monitor relay areas, fuse holders, connectors, and the module body for abnormal temperature rise.
• Final QC record: Record exact model, revision, serial number, termination-panel identity, fuse configuration, all 32 relay results, contact measurements, load-test results, loopback diagnostics, isolation result, hot-spare test where applicable, test duration, and inspector approval.
• ESD-controlled packaging: Place the module in an ESD-safe package and protect connectors, relay interfaces, locking features, and PCB surfaces against impact, moisture, contamination, and electrostatic discharge.

Procurement note: The technically supported identity is TRICONEX 3636R — 32-point Non-Triplicated Relay Output Module. Published Tricon documentation specifies normally-open contacts, 32 non-commoned points, 125 VAC/VDC maximum field voltage, 2 A maximum current per point, 10 mA at 5 VDC minimum permissible load, 2,000 VA / 150 W maximum resistive switching power, <30 cycles/s maximum output rate, 2.5 A fast-acting fuses, and 1,500 VDC minimum point isolation. The module is intended for non-critical points, uses an external termination panel, and supports hot-spare operation.