VT-NSPA1-50-10
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MPN: 249810
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The VT-NSPA1-50-10 is a proportional amplifier with an operating voltage of 24 VDC and an IP65 protection rating. Produced by Bosch Rexroth Indramat as part of the VT-SSPA Plugin Proportional Amplifiers series, it supports a command value input range of 0–10 V proportional and 12 V to UB switching. The amplifier features adjustable ramp times from 100 ms to 5 s.
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Product Description:
Bosch Rexroth Indramat makes the VT-NSPA1-50-10. The VT-NSPA1-50-10 proportional amplifier has a nominal voltage of 24 VDC. This was chosen to match the standard voltage levels used in industrial control systems. The nominal voltage is in line with the distributed control system logic and is the base electrical potential for correct operation. It has an operating envelope of 18 V to 35 V. Staying within these boundaries is crucial for both electrical safety and performance. A dielectric breakdown can damage semiconductors or internal insulation if the upper limit is exceeded. Under-voltage lockout or erratic behavior will occur if the voltage goes below 18 V, as the power and control logic components won’t have enough driving voltage. A dual-mode command voltage range – 0 to 10 V for proportional control and 12 V to full supply voltage for switching functions – defines the input signal processing. With this architecture, one interface can be used for both analog and discrete control systems. The proportional mode, which is linear to the input voltage, allows for precise, continuous changes to the output current or pressure.
The switching range is used for binary control logic where the amplifier responds when a certain voltage threshold is exceeded or to toggle states; when the signal comes from high-impedance sources like PLC analog outputs, the 20 kΩ input impedance ensures the amplifier draws as little current as possible from the signal source, preserving the command signal and avoiding voltage dips. Ramp time changes from 100 ms to 5 s and can be used to adjust the dynamic characteristics of the amplifier. Both the actuator’s mechanical behavior and the control’s time resolution are affected by this parameter, which controls how fast the output current responds to changes in the input signal. Shorter ramp times are essential for systems that need to react fast, like servo-positioning systems or fast-moving hydraulic motors.
With options for bias current up to 2.6 A, the electrical unit is rated for 2.5 A nominal current. With this current control, the amplifier can be adjusted to the specific requirements of various actuators without going above safe current limits. The power stage switching frequency is defined by an internal clock frequency of 305 Hz, which affects filtering needs, thermal efficiency and electromagnetic interference. This frequency of operation allows for reasonable trade-offs between passive component size and switching losses. To ensure component safety and signal stability during current changes, a maximum cable inductance of 100 µH is required to limit the amplitude of transient voltages. The amplifier also meets the IP65 protection class, which means it is protected against low-pressure water jets and dust.
Frequently Asked Questions about VT-NSPA1-50-10:
Q: What is the maximum current adjustment range for the VT-NSPA1-50-10?
A: The maximum current adjustment range for the VT-NSPA1-50-10 is up to 2.6 A. This can be adjusted through bias current settings, offering flexibility in various industrial applications.
Q: What is the command value input range for the VT-NSPA1-50-10?
A: The command value input range for the VT-NSPA1-50-10 is 0–10 V for proportional control and 12 V to UB for switching. This wide range allows for compatibility with various control systems.
Q: How does the VT-NSPA1-50-10 integrate with other systems?
A: The VT-NSPA1-50-10 is designed for seamless integration, featuring both screw terminals and an optional M12x1 connector. The 4-pin M12x1 connector provides additional flexibility in integration for different setups.
Q: What is the protection rating of the VT-NSPA1-50-10?
A: The VT-NSPA1-50-10 has an IP65 protection rating, ensuring it is dust-tight and protected against water ingress, which makes it highly suitable for use in harsh industrial environments.
Q: What is the permissible operating temperature range for the VT-NSPA1-50-10?
A: The VT-NSPA1-50-10 can operate within a temperature range of -25 °C to +60 °C when using the cable gland connection, ensuring it can handle a wide range of environmental conditions.
