178B0757
Wake Industrial LLC is not an authorized distributor of this product.
MPN: VLT5003PT5C20STR3DLF00A00C1
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The Danfoss 178B0757 is part of the VLT 5000 Frequency Converters series, offering a true power factor of 0.90 at nominal rated load. This device includes 8 programmable digital inputs, a programmable voltage input of 0-±10 V DC, and two relay outputs. It operates at a supply frequency of 48-62 Hz ±1%.
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Product Description:
The 178B0757 Frequency Converter supports industrial systems requiring adaptable input and output performance. The unit handles wide supply variations while protecting connected equipment. It offers programmable inputs and advanced PID control. This converter ensures dependable operation across challenging operating environments.
The supply frequency range of this 178B0757 frequency converter is 48 to 62 Hz with tolerance of ± 1 percent. The motor frequency rating supports both 50 Hz and 60 Hz operation. The switching at the supply input terminals L1, L2 and L3 is possible approximately once every two minutes. The output switching of the converter is unlimited that allows flexible system use without restrictions. The maximum short circuit rating is 100 amperes. The ramp times of the converter are adjustable from 0.05 seconds to 3,600 seconds that supports soft start and stop applications. The starting torque is rated at 180 percent for 0.5 seconds that allows robust load starting. The acceleration torque is rated at 100 percent for consistent speed increase during operation. The control card in this converter provides two programmable analog voltage or thermistor inputs located on terminals 53 and 54. The voltage input level ranges from 0 to ±10 V DC and is fully scalable. The input resistance for these channels is specified at 10 kΩ. Additionally, one programmable analog current input is available at terminal 60. The current input range is 0/4 to ± 20 mA also scalable for flexible use. These programmable inputs allow precise monitoring and control integration with external systems.
The differentiator gain limit function of this 178B0757 frequency converter helps maintain stable PID operation under varying conditions. It reduces excessive influence of quick error changes and allows adjustment of differentiation time for system stability. This ensures responsive but controlled regulation.
Frequently Asked Questions about 178B0757:
Q: How does the 178B0757 frequency converter support dynamic ramp adjustments during start-stop transitions?
A: It offers ramp time adjustability from 0.05 to 3,600 seconds for controlled acceleration and deceleration. This allows smooth system transitions tailored to load type and inertia.
Q: What considerations are needed when using the analog inputs on the 178B0757 for external process signals?
A: The control card accepts scalable voltage and current signals through programmable terminals. It supports 0 to ±10 V DC and 0/4 to ±20 mA with high input impedance for accurate interfacing.
Q: How does the Danfoss 178B0757 maintain control loop stability in rapidly changing PID conditions?
A: It uses a differentiator gain limit function to restrict sudden response spikes. Adjustable differentiation time helps dampen instability while keeping the system responsive.
Q: In systems with frequent output engagement, how does the 178B0757 frequency converter handle switching stress?
A: It allows unlimited switching at output terminals without performance degradation. Input terminal switching is also supported with a recommended interval of two minutes for system protection.
Q: What starting behavior can be expected from the Danfoss 178B0757 under high-inertia load conditions?
A: The converter provides high torque during start-up, ensuring robust load engagement. It supports consistent acceleration without stalling, even when faced with challenging mechanical demands.
