Viking Software for item #TDR-1 - TD1-HRT

Viking Electronics TD1-HRT Time Delay Relay

Overview

The Viking Electronics TD1-HRT is a configurable time delay relay built for integrators who need reliable, programmable relay switching across access control, door hardware, automation, and security panel applications. Sold as the software/configuration component for the TDR-1 platform, the TD1-HRT (often searched as TD1 HRT) gives you eight selectable closure times spanning 1 to 30 seconds — enough range to handle everything from electric strike hold-open timing to sequenced equipment activation without custom programming or external controllers.

At 2.9" x 2.1" x 1.0" (74mm x 53mm x 25mm), the unit mounts in tight enclosures where space is a constraint. It ships with a 120V AC to 12V DC adapter, so it runs directly from standard commercial power without a separate power supply or panel tap.

Key Features

• Eight Selectable Closure Times (1–30 seconds): Eight discrete delay steps give you precise control over hold-open, release, or activation timing. On electric strike or mag-lock applications, this means you can dial in exactly how long a door stays released — no guessing, no manual trimmer adjustments.
• Delay on Operate Mode: The TDR-1 platform supports Time Delay and Delay on Operate modes. Delay on Operate is especially useful for sequencing HVAC dampers, lighting circuits, or equipment that needs to spin up before a secondary load activates.
• Logic-Level and Dry-Contact Input: The TD1-HRT accepts either a +5 VDC logic-level signal or a dry contact closure as its trigger input. That dual-input capability means it integrates directly with access control panels, alarm outputs, PLC I/O, or simple pushbutton circuits — no signal conditioning required.
• Relay Rating Handles Real Loads: Rated at 1A @ 30VDC, 0.3A @ 110VDC, and 0.5A @ 125VAC, the output relay handles most low-voltage door hardware, indicator loads, and auxiliary relay coils without an interposing relay. Know your load current before wiring — this isn't rated for motor or inductive spike loads at line voltage.
• 10-Position Cage Clamp Terminal Strip: Cage clamp terminals accept solid or stranded wire without requiring ferrules, which speeds up installation and reduces field wiring errors compared to screw-clamp alternatives.
• Compact Form Factor for Enclosure Mounting: At 0.86 lbs and under 3 inches in any dimension, the TD1-HRT fits inside standard access control enclosures alongside panels, power supplies, or relay boards — no dedicated housing required.
• Wide Humidity Tolerance: Rated 5% to 95% non-condensing humidity, so it operates reliably in utility rooms, mechanical spaces, and server closets where ambient conditions fluctuate.

Integration & Compatibility

The TD1-HRT is triggered by any source producing a +5 VDC logic signal or a contact closure — making it compatible with virtually any access control panel, alarm control panel, or PLC with a relay output. The 10-position terminal strip accommodates multi-wire connections for input, output, and power in a single compact block. Operating temperature is rated 32°F to 90°F (0°C to 32°C), which suits indoor commercial and light industrial environments. The included 120V AC to 12V DC adapter eliminates the need to source a separate supply, simplifying commissioning.

Frequently Asked Questions

Q: What delay times are available on the TD1-HRT?

A: The TD1-HRT offers 8 selectable closure times ranging from 1 to 30 seconds, giving integrators precise control over relay timing without external adjustment.

Q: What trigger inputs does the TD1-HRT accept?

A: It accepts either a +5 VDC logic-level voltage signal or a dry contact closure, making it compatible with access control panels, alarm outputs, and PLC I/O directly.

Q: Does the TD1-HRT include a power supply?

A: Yes. A 120V AC to 12V DC adapter is provided with the unit, so no separate power supply is required for standard commercial installations.

Q: What is the relay output rating on the TD1-HRT?

A: The relay is rated 1A @ 30VDC, 0.3A @ 110VDC, and 0.5A @ 125VAC. It handles low-voltage door hardware and auxiliary loads, but is not rated for high-inductive motor loads at line voltage.

Q: What is the warranty on the TD1-HRT?

A: Viking Electronics provides a Two Year Limited warranty on the TD1-HRT.

Q: What operating environment is the TD1-HRT rated for?

A: The unit is rated for 32°F to 90°F (0°C to 32°C) operating temperature and 5% to 95% non-condensing humidity — appropriate for indoor commercial and light industrial spaces.

Marty Allison

The TD1-HRT is one of those utility devices that shows up in a lot of access control bids because it solves a very specific problem cleanly: you need a programmable hold-open or delay sequence on a door strike or auxiliary circuit, and you don't want to burn an access panel output on a custom timer logic block. With 8 discrete delay steps from 1 to 30 seconds and a dual-input trigger accepting either +5 VDC or contact closure, this unit drops into almost any panel architecture without signal conditioning.

Technical Highlights:

• 8 Closure Time Steps (1–30 sec): Discrete selection eliminates the drift and inconsistency of analog trimmer-based timers — critical when your door release timing has to match a fire alarm panel's output pulse.
• Dual Trigger Input (+5 VDC / Dry Contact): Covers both digital panel outputs and traditional relay-driven circuits in a single SKU, so you're not stocking two variants for mixed-panel sites.
• Relay Output 1A @ 30VDC / 0.5A @ 125VAC: Adequate for electric strikes, indicator lamps, and relay coils. If you're driving a mag-lock directly, confirm your lock's inrush doesn't exceed the contact rating — an interposing relay may be warranted.

Deployment Considerations:

• Operating temperature tops out at 90°F (32°C) — fine for conditioned mechanical rooms, but verify ambient temps in non-air-conditioned utility closets in warmer climates before installing without ventilation.
• The included 120V AC to 12V DC adapter requires a standard AC outlet in the enclosure area; if your panel location is outlet-free, plan for a power strip or local outlet during rough-in.

The TD1-HRT is the right call on commercial door control retrofits and multi-zone sequencing jobs where the access panel lacks a built-in configurable timer output and panel programming changes aren't an option — particularly on legacy systems where adding logic means rewiring, not reprogramming.