Description

Application Scenarios

A packaging machinery manufacturer designing a high-speed flow-wrapping system faced a persistent challenge: the existing general-purpose inverter driving the servo motor could not deliver the instantaneous acceleration required at 300 packs per minute, causing cut-position deviation exceeding ±3mm and generating substantial scrap. After switching to the DST1405, its 24A peak current capability matched the servo motor‘s transient demands during acceleration and deceleration phases, while the drive’s high-bandwidth current loop stabilized the cutting axis response. Cut-position accuracy improved to within ±0.5mm, and scrap rates dropped significantly. Equally important, the DST1405‘s integrated Safe Torque Off function—certified to SIL 3 / PL e—allowed the safety door circuit to cut torque directly at the drive without external safety contactors, simplifying the panel design and reducing component count. For packaging equipment where high-speed precision and operator safety must coexist, the DST1405 addressed both requirements within a single compact unit.

Parameter

Main Parameters	Value / Description
Product Model	DST1405
Manufacturer	Nidec Control Techniques (Digitax ST series)
Product Category	Servo Drive / Servo Amplifier
Rated Supply Voltage	400V (380–480V ±10%) three-phase
Nominal Output Current	8.0 Arms
Peak Output Current	24.0 Arms (300% overload capability)
Power Rating (without line reactor)	3.32 kW
Power Rating (with line reactor)	3.65 kW
Internal Braking Resistor	70Ω, 50W average, 8.7 kW peak (at 400V)
Analog Inputs	1 high-resolution (16-bit + sign), 1 standard (10-bit + sign)
Safety Function	Safe Torque Off (STO), SIL 3 / PL e / Cat. 3
Communication	RS-485 Modbus RTU programming port
Protection Rating	IP20 (UL Type 1 / NEMA 1)
Operating Temperature	0°C to 50°C (derate above 40°C)
Weight	2.1 kg (excluding keypad and option modules)

Technical Principles and Innovative Values

300% Peak Current for High-Dynamic Motion: The DST1405 delivers 8.0 Arms continuous and 24.0 Arms peak current, providing a 3:1 overload ratio . This capability is critical for servo applications involving rapid acceleration, frequent start-stop cycles, or sudden load changes. In flow-wrapping, labeling, and flying-shear applications, the drive‘s ability to source transient current beyond nominal rating determines the achievable production rate rather than the motor or mechanical system.
Integrated Safe Torque Off Eliminates External Safety Hardware: The DST1405 incorporates STO as a standard feature across the Digitax ST range, certified to SIL 3 and PL e . When the safety circuit is triggered, the drive removes torque-producing power from the motor while maintaining position feedback and communication functions. For machines with frequent safety-door access—such as packaging lines, robot cells, and assembly stations—this design removes the need for per-drive safety contactors, reducing panel space, wiring complexity, and potential failure points in the safety chain.
Smartcard Parameter Storage for Rapid Drive Replacement: Digitax ST drives support removable Smartcard memory cards for complete parameter and application storage. With the DST1405, a failed unit can be replaced by transferring the Smartcard from the old drive to the new one, restoring full configuration on power-up without a laptop or commissioning software . For OEMs supporting machines in the field, this capability transforms drive replacement from a skilled engineering task into a maintenance-level procedure, minimizing mean time to repair.