S74802-DNF2-NA Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen S74802-DNF2-NA is a servo drive from the S700 Servo Drives series, designed with a continuous brake power of 8 kW and a peak output current of 96 Arms. It has a rated input power of 35 kVA, supports a voltage rating of 208 to 480V, and weighs 13 kg. The drive also features dual channel STO capability and a Devicenet isolation of 500 V with support for up to 64 nodes.
Internal Product Review
The S74802-DNF2-NA is a Kollmorgen S700 servo drive that delivers 48 Arms rated current and 96 Arms peak output current. Dual-channel STO and 8 kHz switching give the drive strong control integrity, making it a highly capable choice for demanding motion systems.
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Product Description:
The S74802-DNF2-NA is a servo drive produced by Kollmorgen in the S700 Servo Drives series. It converts three-phase line power into precisely regulated AC output for motors that position, index, and synchronize loads in automated machinery. Rated for high-performance motion, the unit incorporates dual-channel STO hardware so that axes can be disabled safely while the bus remains energized. This arrangement allows the machine to remove torque-producing output from the motor while keeping the drive system powered for controlled operation in guarded machine zones.
Electrically, the drive draws a maximum input of 35 kVA from three-phase mains in the 208 to 480 V range. Under continuous operation, it delivers up to 48 Arms to the motor, while short-term acceleration is supported by a peak current of 96 Arms. An insulated-gate bridge switches at 8 kHz, providing fine current resolution and helping reduce audible noise during operation. The DeviceNet interface supports a 64-node network and is galvanically isolated from the control logic to limit common-mode faults. A residual direct-current path limited to 6 V across the DC bus helps keep contactors from chattering, and terminals are provided for an external brake resistor so regenerated energy can be dissipated during deceleration.
Mechanical integration is simplified by a 190 mm width, a 285 mm depth with connectors, and a 505 mm overall height, while the assembly weighs only 13 kg. The optional fan-controller expansion card activates cooling when internal temperature reaches 65 °C, and standby thermal dissipation is held to 24 W once airflow is established. For dynamic braking, the drive uses an external resistor of 15 Ω, allowing up to 8 kW of regenerated power to be absorbed without exceeding bus limits. Field wiring also benefits from DeviceNet isolation rated at 500 V, which helps separate the network from the control electronics. The switch on and off rate of 30 cycles per hour helps protect the capacitors, and standard PCBs are used in the control and power sections.
