MTL MTL8913-PS-AC Retrofit-Ready AC Power Supply for 8000 Series Control Systems
The MTL8913-PS-AC is a dual-voltage AC power supply module engineered for seamless integration into MTL 8000 Series Zener barrier and galvanic isolator systems. As legacy MTL 8000 Series installations approach end-of-support cycles, plant engineers and maintenance teams increasingly rely on the MTL8913-PS-AC as the primary retrofit solution for sustaining intrinsically safe (IS) field instrument loops without requiring full panel redesign. This module delivers regulated DC bus power to the MTL8000 backplane, supporting continuous operation of IS barriers, signal conditioners, and I/O modules in hazardous area control architectures.
Whether you are replacing a failed MTL8913-PS-AC in an operating plant, upgrading an aging DCS front-end, or consolidating spare parts inventory for a multi-site maintenance program, this power supply module provides the electrical compatibility, form factor, and certification credentials required for drop-in installation. It accepts a wide AC input voltage range, making it suitable for both 110 VAC and 230 VAC site power standards without hardware modification. Output regulation maintains stable DC rail voltage across the full backplane load, protecting downstream MTL8000 series modules from voltage sag during peak I/O demand.
Sourced from verified supply channels and subject to pre-shipment functional testing, each MTL8913-PS-AC unit shipped by SMARTNEXMSK is covered by a 12-month warranty. Fast dispatch from Xiamen warehouse supports urgent MRO requirements and planned shutdown windows globally.
Upgrade Compatibility Table
| Parameter | MTL8913-PS-AC | Retrofit Notes |
|---|---|---|
| Input Voltage | 85–264 VAC, 47–63 Hz | Compatible with 110 VAC and 230 VAC site standards; no tap selection required |
| Output Voltage | Regulated DC bus for MTL8000 backplane | Verify backplane rail voltage matches existing MTL8000 series installation |
| Mounting / Form Factor | DIN rail, MTL8000 Series backplane slot | Direct drop-in; no bracket modification required for standard MTL8000 racks |
| Backplane Interface | MTL8000 Series bus connector | Confirm backplane revision; early MTL8000 backplanes may require firmware check on MTL8000 controller |
| Communication Compatibility | Power only; no protocol dependency | No impact on HART, FOUNDATION Fieldbus, or Modbus links carried by MTL8000 I/O modules |
| Redundancy Support | Supports dual PSU configuration | Pair with second MTL8913-PS-AC for N+1 redundancy; verify load-sharing jumper settings on backplane |
| Replacement Candidates | MTL8913-PS-AC (direct), MTL8913-PS-DC (DC input variant) | Confirm AC vs DC site supply before ordering; DC variant requires separate sourcing |
| Commissioning Requirement | No software configuration required | Verify LED status indicators post-installation; check MTL8000 system diagnostics via MTL8000 configuration software |
| Warranty | 12 Months | Covered from date of shipment; includes functional test certificate on request |
Retrofit Planning for Existing Automation Systems
Successful integration of the MTL8913-PS-AC into an operating plant begins with a structured pre-retrofit assessment. Before removing the failed or aging power supply, engineers should document the current backplane load by auditing all installed MTL8000 series modules — including MTL8041 and MTL8042 Zener barriers, MTL8044 and MTL8046 galvanic isolators, and any MTL8000 series HART multiplexer modules occupying the same rack. Total the current draw of all active modules to confirm the MTL8913-PS-AC output capacity is not exceeded, particularly in high-density I/O configurations where 16 or more barrier modules share a single backplane.
Terminal wiring at the AC input side should be inspected and re-torqued to manufacturer specification during the replacement window. The MTL8913-PS-AC uses standard screw-terminal AC input connections; verify that cable cross-section and insulation rating comply with local electrical codes and the site’s area classification documentation. If the control cabinet also houses an MTL8000 series communication interface module — such as an MTL8000 Modbus gateway or PROFIBUS DP coupler — confirm that the communication link to the host DCS or SCADA system remains active during the PSU swap by using the redundant power path if available.
For sites migrating from older MTL5000 series Zener barriers to the MTL8000 platform as part of a broader modernization program, the MTL8913-PS-AC is the standard power entry point for the new backplane. This migration typically also involves replacing MTL5041 and MTL5046 barriers with their MTL8000 equivalents, updating the MTL programming cable connection to the new configuration port, and revising HMI faceplates in the SCADA system to reflect the new I/O module addresses. The MTL8913-PS-AC supports this transition without requiring changes to field wiring at the hazardous area junction boxes, provided the IS loop parameters remain within the certified entity parameters of the new barrier modules.
Where the retrofit scope includes I/O expansion — adding new MTL8000 series analog input or digital output modules to an existing rack — the MTL8913-PS-AC power budget must be recalculated before commissioning. Adding MTL8044 isolators or MTL8048 relay output modules increases backplane current demand; if the existing single MTL8913-PS-AC is operating near capacity, a second unit should be installed in the redundant PSU slot before the expansion modules are energized. This approach eliminates the risk of nuisance trips caused by inrush current during module insertion.
Downtime Control During System Migration
Minimizing production downtime during an MTL8913-PS-AC replacement requires a disciplined sequence of pre-shutdown, execution, and restoration steps. Before the maintenance window opens, obtain a full backup of the MTL8000 system configuration using the MTL8000 configuration software connected via the MTL programming cable. This backup preserves all module addresses, HART pass-through settings, and alarm thresholds, ensuring that if any configuration data is lost during the power interruption, restoration is a matter of minutes rather than hours.
Where the MTL8000 backplane supports dual power supply slots and a second MTL8913-PS-AC is installed, the failed unit can be hot-swapped without interrupting the DC bus, provided the remaining PSU has sufficient capacity to carry the full backplane load. Confirm this by checking the system load summary in the MTL8000 configuration software before initiating the swap. If only a single PSU slot is populated, coordinate with the process control team to place the affected field loops in manual mode at the DCS before de-energizing the backplane. Document the current output values of all HART instruments on the affected loops so that operators can maintain manual setpoints during the outage.
After installing the replacement MTL8913-PS-AC, restore power to the backplane and verify that all MTL8000 series modules return to normal status within the expected startup time. Check the system diagnostic LEDs on each barrier and isolator module, and confirm that HART communication is re-established between the field instruments and the DCS HART multiplexer. If any module fails to initialize, reseat it in the backplane slot and re-check the DC bus voltage at the backplane test points. Once all loops are confirmed healthy, return the affected process loops from manual to automatic control and document the completed maintenance activity in the plant CMMS.
Retrofit Support FAQ
Q1: Is the MTL8913-PS-AC a direct replacement for the original MTL 8000 Series power supply?
Yes. The MTL8913-PS-AC is a direct form-fit-function replacement for the original MTL8913-PS-AC power supply module. It occupies the same backplane slot, uses the same bus connector, and requires no software configuration. Pre-shipment functional testing is performed on every unit, and a test certificate is available on request.
Q2: What wiring checks are required before installing the replacement module?
Inspect and re-torque the AC input terminal connections. Verify that the supply voltage at the terminal matches the MTL8913-PS-AC input specification (85–264 VAC). Check that the protective earth conductor is securely connected and that cable insulation is undamaged. No changes to field wiring in the hazardous area are required for a like-for-like PSU replacement.
Q3: Will replacing the MTL8913-PS-AC affect HART or Modbus communication on the MTL8000 backplane?
No. The MTL8913-PS-AC is a power-only module with no protocol dependency. HART pass-through, Modbus gateway functions, and FOUNDATION Fieldbus segments carried by other MTL8000 series modules are unaffected by the PSU replacement, provided the backplane DC bus is restored within the timeout window of the host DCS communication driver.
Q4: What does the 12-month warranty cover?
The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions from the date of shipment. It includes free replacement or repair of the defective unit. Warranty claims are supported by SMARTNEXMSK’s technical team; contact sales@smartnexmsk.com with the order reference and a description of the fault. Units damaged by incorrect installation, overvoltage, or unauthorized modification are excluded from warranty coverage.
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