Description
Application Scenarios
A steel wire drawing line operating two 45 kW DC motors (payoff and take-up) on a Reliance GV3000/SE 2-axis drive experienced recurring DC-link overvoltage (OV) trips during rapid deceleration of the take-up reel. The original single brake resistor, sized for steady-state regeneration, could not absorb the 2-second 120% regenerative spike triggered when the dancer arm snapped taut, resulting in approximately 45 minutes of re-threading downtime per trip. The retrofit installed a DBM-04 (CY1603B3) between the GV drive’s DC-link bus and two 15Ω/12 kW brake resistors, cross-coupled through the module’s internal steering diodes. The DBM-04 monitors Vdc per axis; when the link crosses the 750V threshold (set via DIP switches on the CY1603B3 board), it PWM-switches the per-axis IGBT to clamp the bus. Because the module is dual-axis, regenerative energy from the payoff reel (which acts as a generator during payout acceleration) can be routed to the take-up resistor during shared windows—an impossibility with a single-axis brake solution. Post-installation, OV trips dropped from 3–4 per week to zero across an 8-month production campaign, and the line’s top speed was increased by 6% because the drive no longer needed to derate its deceleration ramp to protect the DC link .
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | DBM-04 (Board P/N: CY1603B3) |
| Manufacturer | MOOG (Reliance Electric legacy ecosystem) |
| Product Category | Dual-Axis Static Trip / Dynamic Brake Module |
| Compatible Drives | Reliance GV3000/SE, FlexPak Plus, MinPak Plus (2-axis configurations) |
| Number of Axes | 2 (independent chopper per axis, shared DC-link sense) |
| DC Link Voltage Range | 300–700 V DC (460 V AC input drive class) |
| Chopper IGBT Rating | 75 A / 1200 V (per axis, internal) |
| Continuous Brake Current | ~25–40 A per axis (resistor-dependent) |
| Peak Brake Current | ~80 A for 2 s |
| Trip Functions | I²t motor overload, DC-link OV, brake-resistor PTC thermal |
| Armature Sense Input | 0–10 V or 4–20 mA from drive’s armature shunt (I²t source) |
| Mounting / Form Factor | PCB with standoffs, panel-mount in drive cubicle |
| Operating Temperature | 0°C to +50°C (cabinet ambient) |
Technical Principles and Innovative Values
- Innovation Point 1: Dual-Axis Regenerative Sharing via Cross-Steering Diodes. In a 2-axis winder configuration, one motor is almost always regenerating (the unwind payoff side) while the other is motoring (the take-up draw side). A conventional single-axis brake wastes the payoff’s regenerative energy as heat on its own resistor while the take-up side may still experience OV faults. The DBM-04 steers regenerative current from either axis to either resistor (or to a shared resistor bank) based on which chopper is active, maximizing resistor utilization. On the CY1603B3 board, jumpers J1–J4 select the steering mode: “independent,” “shared-A-primary,” or “shared-B-primary” .
- Innovation Point 2: Integrated Static Trip (I²t) Eliminating External Overload Relays. The DBM-04 accepts a 0–10 V armature-current sense signal from the GV drive’s 50 mV or 200 mV shunt and runs an internal I²t accumulation model for each axis. This eliminates the need for external overload relays or thermal protection devices, simplifying system architecture, reducing wiring complexity, and removing a potential failure point from the protection chain .
- Innovation Point 3: Brake-Resistor Thermal Monitoring Integration. The module includes a dedicated PTC thermistor input for brake-resistor temperature monitoring. When resistor temperature exceeds a safe threshold, the DBM-04 triggers an alarm or trip condition, preventing fire hazards or resistor damage due to thermal overload. This functionality upgrades braking-circuit safety monitoring from reactive detection to real-time warning .
