SDC Security Door Controls WPT Wireless Power Transfer Device

We've deployed the SDC WPT across 40+ retrofit projects over the past three years—mostly mid-market office buildings and light industrial facilities where cutting a clean hole through a wood or composite door frame was either structurally risky or logistically expensive. The wireless power model eliminates a real pain point: on retrofit jobs, you're almost never starting with a blank slate, and core drilling adds equipment rental, site coordination, and time-cost burden that clients hate. The WPT sidesteps all of that. Transmitter and receiver pair up via RF coupling across the door gap, so your electrician can mount the frame-side assembly to the header or jamb and the door-side receiver to the lock rail without any through-frame wiring—just two short control cables back to your panel. OSDP and TCP/IP support means integrators have no custom firmware or proprietary bridges to wrestle with; it plays nicely with Genetec, HID, Salto, and most mid-market access control platforms. The real differentiator for us is the 63-door capacity and 250K user credential limit—that's enterprise-class scalability without needing multiple controllers or segmentation tricks. On a 50-door retrofit across a campus, you can run the entire lock fleet from one WPT and one panel. For integrators accustomed to managing credential bloat and controller fragmentation, that's a meaningful simplification.

Technical Highlights:

• RF Power Coupling (600 mA @ 12VDC or 300 mA @ 24VDC output): Door-side power is entirely wireless—no frame-to-door wiring runs needed. Most electrified mortise locks and electric strikes operate comfortably at 600 mA @ 12VDC; high-power auxiliary solenoids may require 24VDC output mode at reduced current. We've never seen a customer exceed the 300 mA @ 24VDC budget on standard lock hardware, but sensor-heavy doors (door position, latch status, REX) sometimes push it. Know your lock and auxiliary load before specifying output voltage.
• 24VDC Input @ 600 mA Continuous: Frame-side power draw is steady and predictable—no intermittent RF spike or efficiency loss. UPS backup on the frame-side 24VDC source ensures graceful de-energization during power loss; locks drop to unpowered state per your strike logic (fail-safe or fail-secure).
• OSDP and TCP/IP Protocols: No proprietary RF handshake or black-box encryption. REX, door position, and latch status feedback transit over standard protocols that every major access control platform understands. Troubleshooting is straightforward—packet capture and panel diagnostics reveal exact state.
• Multi-Credential Format Support (DESFire, MIFARE, NFC, 125kHz Prox): Single WPT controller manages all four credential types simultaneously. Legacy proximity systems, modern NFC deployments, and high-security DESFire—no separate readers or credential logic required. Reduces BOM complexity on mixed-legacy/modern migrations.
• Alignment Tolerance (±1/16" within 1/4" door gap): The RF coupling is finicky; misalignment beyond ±2mm degrades power transfer and can cause intermittent lock de-energization under cold-start conditions. We've learned to use a 3D-printed alignment jig on jobs with multiple doors; worth the 15-minute CAD investment before first door install.

Deployment Considerations:

• Transmitter and receiver must be coaxial within ±2mm and fit within 7mm door gap. Measure door thickness and gap before ordering; retrofit doors with uneven edges or warped jambs sometimes require shimming or slight frame modification to achieve proper spacing. Not a showstopper, but budget 10 extra minutes per door for alignment troubleshooting.
• RF coupling has no shielding—do not install in environments with high-frequency industrial machinery (welding, induction heating, heavy RF broadcast). We've had three customer sites where nearby radio transmitters caused intermittent lock drop-outs; Faraday shielding on the transmitter assembly fixed it, but it's a known edge case.
• Door-side relay outputs (REX, door position, latch feedback) require proper voltage and impedance matching to your access control panel. REX button circuit is typically dry contact; latch status and door position are passive switches. Verify panel input specs before wiring—some legacy panels expect 24VDC supervisory signaling, not dry contact closure.
• Lifetime warranty covers RF transceiver and relay hardware, but does not include customer-supplied locks, latches, or auxiliary devices. If a lock fails during RF power delivery, warranty claim is typically denied—it's a lock failure, not a WPT failure. Educate end-customers on this distinction upfront.
• No battery or onboard power storage—power loss on the frame side results in immediate de-energization on the door side. Fail-safe or fail-secure behavior is determined by your lock hardware and strike design, not the WPT. If your site requires temporary lock backup on power failure, spec a 24VDC UPS on the frame-side input.

The SDC WPT is purpose-built for integrators and facility managers who are retrofitting electrified access control into existing openings and can't afford the labor and structural cost of traditional wired strike installation. It scales to enterprise capacity (63 doors, 250K users) without fragmentation, supports legacy and modern credentials simultaneously, and integrates cleanly into any OSDP/TCP/IP access control platform. If you're on a retrofit project and drilling through the door frame is a deal-breaker, this is the product to specify. See the SDC catalog for compatible lock hardware and integration guides.