Product Description

Model Number Definition

• 24: Indicates 24 VDC control logic compatibility.

• C: Series code for control/interface modules (Reliance Electric standard).

• 4140: Core functional code: 41 = DC bus monitoring, 40 = 40 HP power range compatibility.

• U: Suffix for universal or updated version, denoting revised circuitry for wider drive compatibility.

Technical Specifications

• Control Voltage: 24 VDC ±10%

• DC Bus Monitoring Range: 0–800 VDC

• Brake Current Monitoring: 0–50 ADC

• Switched Output Rating: 24 VDC / 1 A (transistor, non-contact)

• Operating Temperature: -10°C to +60°C

• Storage Temperature: -40°C to +85°C

• Enclosure Rating: NEMA 1 (IP20), panel-mount

• Weight: ~0.88 kg

• Certifications: UL recognized, RoHS compliant

Interface & Communication Configuration

• Power Terminals: 24 VDC (±), DC Bus (+/−), Brake Current Sense

• Control Outputs: S1-2 (switched transistor output, terminals 1=−, 2=+)

• Status Indicators:

  • Left LED: ON when DC bus voltage > 50 VDC

  • Right LED: ON when braking current (IB) > 0

• Communication: No direct fieldbus; hardwired I/O for drive interlock and brake control

Core Functions

• DC Bus Voltage Monitoring: Continuously tracks DC bus level; triggers status LED at >50 VDC

• Brake Current Detection: Monitors braking current; activates right LED during regeneration

• Smart Brake Control: Transistor switch S1-2 closes when DC bus >50 V and IB=0; opens during braking or low bus voltage

• Isolation & Protection: Electrical isolation between high-voltage DC bus and low-voltage control circuits

• System Interlock: Provides dry-contact equivalent signal for drive enable/interlock logic

Application Scenarios

• Reliance GV3000/FlexPak Drives: 20–50 HP AC drives (380–460 VAC)

• Industrial Motion Control: Conveyors, cranes, hoists requiring dynamic braking

• Process Industry: Pumps, fans, extruders with regenerative loads

• Legacy System Retrofits: Replacement for aged brake control modules in existing installations

• High-Power Drive Maintenance: Critical spare for minimizing downtime in manufacturing

Usage & Maintenance Instructions

• Installation: Mount vertically on DIN rail or panel; allow 50 mm clearance for ventilation. Torque terminals to 1.2–1.5 Nm.

• Wiring: Use shielded cables for DC bus and brake signals; separate from AC power wiring by ≥100 mm.

• Operation: Verify LED status after power-up: left LED ON (bus charged), right LED OFF (no braking).

• Maintenance: Inspect terminals quarterly for tightness/corrosion; clean housing annually with dry cloth.

• Safety: Disconnect all power (AC and DC) before maintenance; wait 5 minutes for DC bus discharge.