Inverter PWM DC drive IP65 (NEMA-4X), 0.02 - 2 HP | KBPW Series
KB Electronics, Inc.
The KBPW-240D is a PWM (pulse width modulated) control in a NEMA-4X / IP-65 washdown and watertight enclosure designed to oper- ate Permanent Magnet and Shunt Wound motors through 7.5 Amps DC. The efficient PWM waveform, operating at a switching frequency greater than 16kHz, provides almost pure DC to the motor (form factor <1.05). This provides high motor efficiency, whisper quiet operation along with less motor heating. This allows for a smaller, less costly motor to be used in most applications. Another advantage of PWM is higher output volt- age (up to 130 VDC for 115 VAC lines and 220 VDC for 230 VAC lines) which provides increased motor speed. The KBPW-240D contains pulse-by-pulse current sensing, which provides short circuit protection and prevents control damage due to commutator arcing. Permanent magnet motor demagnetization is virtu- ally eliminated because current peaks are reduced to safe levels. In addi- tion, the main power transistor is mounted to a heat spreader , providing enhanced heat dissipation. This eliminates over temperature cycles that cause premature transistor failure. A unique feature of the KBPW-240D is its active bridge, which sub- stantially reduces the AC line surge current during cycling of the AC line. This allows the control to be turned on and off rapidly without damage to critical components. The active bridge is coupled with a failsafe circuit that will shut down the control if the main power transistor shorts, pre- venting a dangerous high-speed runaway condition.
