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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Specification |
| Manufacturer | Dart Controls, Inc. |
| Part Number | 123D-C |
| Input Supply Voltage | 120 V AC or 240 V AC (±10%), 50/60 Hz |
| Armature Voltage Output | 0–90 V DC (at 120 V AC) / 0–180 V DC (at 240 V AC) |
| Field Voltage Output | 50/100 V DC (at 120 V AC) / 100/200 V DC (at 240 V AC) |
| Continuous Current Rating | 5.5 A (Chassis mount) / 10 A (With auxiliary heatsink) |
| Horsepower Range | 1/50 HP to 1 HP @ 90 V DC / 1/25 HP to 2 HP @ 180 V DC |
| Speed Range & Regulation | 50:1 speed range |
| Adjustable Trimpots | Minimum Speed, Maximum Speed, IR Compensation, Current Limit, Acceleration |
| Operating Temperature | −10°C to +45°C (14°F to 113°F) |
Product Introduction & Supply Chain Strategy
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned conveyor, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Dart Controls 123D-C is an open-chassis SCR variable speed controller designed to regulate fractional-to-2HP brushed DC motors in material handling, packaging machinery, and metering pumps.
From a Total Cost of Ownership (TCO) perspective, keeping a verified New Surplus 123D-C drive on hand is a low-cost, high-impact insurance policy against conveyor or feeder line shutdowns. Because a blown SCR or motor driver halts material processing immediately, having a pre-calibrated spare on-site cuts lead time variability down to minutes. Buying New Surplus provides factory-fresh SCR power components and pristine gate-firing circuits, eliminating the early thermal breakdown risks inherent in refurbished drives.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Lock-Out/Tag-Out (LOTO) incoming AC power feeds supplying the motor control enclosure.
- Verify motor specifications: confirm the motor is rated for 90 V DC (on 120 V AC input) or 180 V DC (on 240 V AC input) permanent magnet or shunt-wound operation.
- Record existing trimpot positions (MIN, MAX, IR, CL, ACCEL) and wire connections from the drive being replaced.
Stage 2: Removal
- Disconnect high-voltage line feeds (L1, L2), armature outputs (A1, A2), field terminals (F1, F2), and speed pot connections (P1, P2, P3).
- Remove the corner mounting screws securing the aluminum chassis plate to the panel backplate.
- Lift the unit off the panel and store inside ESD-protective packaging.
Stage 3: Installation (Clone & Seat)
- Set the AC voltage selection jumpers on the 123D-C to match line voltage (120 V AC or 240 V AC).
- Mount the 123D-C chassis securely to the enclosure backplate using thermal grease or a proper heatsink surface if running above 5.5 A continuous load.
- Reconnect all wiring leads using insulated spade terminals, ensuring proper polarity for A1/A2 armature connections.
Stage 4: Power-On & Testing
- Connect a 5 kΩ to 10 kΩ speed potentiometer to terminals P1, P2, P3, setting the speed dial to zero.
- Apply AC power and verify green status indication; slowly turn the speed pot clockwise to confirm smooth armature acceleration without motor cogging.
- Adjust the CL (Current Limit) trimpot to 125% of rated motor full-load amps to protect the drive and motor from mechanical jam conditions.
123D-C
123D-C
Firmware/Software Versions & Upgrade Notes
- Drive Architecture: Fully analog SCR bridge design (No microprocessor firmware required).
- Compatibility Considerations: The 123D-C is a direct drop-in replacement for standard 120-series Dart drives (e.g., 120D-C, 122D-C, 125D-C) and equivalent KB Electronics KBMM-series chassis drives.
- Potentiometer & Signal Tuning: Standard operation uses a 3-wire 5 kΩ speed potentiometer. If driving speed reference via an external PLC 0–5 V DC or 4–20 mA signal, an isolated signal follower card (such as the Dart Opto-Isolator option) must be installed to prevent ground loops that can destroy the drive logic.
Frequently Asked Questions (FAQ)
Is this Dart 123D-C drive 100% New Surplus?
Yes. This drive is 100% Genuine New Surplus. It has never been wired into an active machine or placed into service, and has been stored in original anti-static conditions. We enforce a zero-tolerance policy against second-hand, pulled, or refurbished components.
Why buy New Surplus instead of a refurbished DC motor drive?
Refurbished DC drives frequently suffer from degraded SCR power bridges and thermal fatigue in power resistors caused by historical motor overloads. Investing in New Surplus guarantees fresh power semiconductors and full component lifespan, protecting your application against sudden short-circuit failures.
What is the difference between chassis mounting and using an auxiliary heatsink?
Without an additional heatsink, the 123D-C is rated for 5.5 A continuous DC output (up to 1/2 HP at 90 V DC or 1 HP at 180 V DC). Mounting the board to an auxiliary aluminum heatsink increases heat dissipation capacity to 10 A continuous, allowing operation of up to 1 HP at 90 V DC or 2 HP at 180 V DC.
Can this drive control brushless DC (BLDC) motors or AC induction motors?
No. The 123D-C is an SCR phase-control drive specifically engineered for brushed DC motors (permanent magnet or shunt wound). Attempting to power a BLDC or AC motor with this drive will cause immediate electrical damage.
What warranty coverage is included with this drive?
Unlike typical short-term warranties on used surplus parts, our New Surplus Dart 123D-C drive includes a full 1-year functional replacement warranty backed by static and power-on testing verification prior to shipment.
