178B7527
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MPN: VLT6172HT4CN1STR1DLF00A00C0
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The 178B7527 is a versatile HVAC drive supporting an output frequency range of 0-120 Hz. Manufactured by Danfoss, part of the VLT 6000 HVAC Drives series, it operates with a rated supply voltage of 3 x 380/400/415/440/460 V ±10%. It features NEMA 1 and NEMA 12 enclosures and offers 110% overload torque.
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Product Description:
The 178B7527 Frequency Converter from Danfoss provides efficient motor control in demanding environments. It operates on a 3 phase 380 – 460 V mains supply and is optimized for output performance with robust overload and torque capacity.
This 178B7527 frequency converter offers a nominal output current of 260 A for 380 - 440 V operation and 240 A for 441 - 460 V. Its 60-second maximum output reaches 286 A (380 - 440 V) and 264 A (441 - 460 V). The converter supports maximum cable cross sections of 2 x 70 mm² or 2x2/0 mcm to both motor and DC-bus. The control features include a frequency range of 0 – 1000 Hz with ± 0.003 Hz resolution. The system tolerates a maximum short circuit current of 100,000 A. The switching on the supply inputs (L1, L2, L3) is limited to approximately once every 2 minutes. The ramp times are configurable from 1 to 3600 seconds that supports flexible acceleration and deceleration profiles. The rated motor frequency is 50 - 60 Hz. For torque performance, starting torque is 110 % for 1 minute with a high break away torque of 160 % for 0.5 seconds under parameter 110. These characteristics ensure stable motor operation under dynamic load conditions and during startup.
The 178B7527 frequency converter delivers nominal output power of 180 kVA at 400 V and 191 kVA at 460 V. The corresponding shaft output is 132 kW (380 - 440 V) and 200 HP (441 - 460 V). The system response time is measured at 3 milliseconds that ensures fast reactions to control inputs. This model is suitable for applications requiring high torque, precision control and configurable motor operation profiles.
Frequently Asked Questions about 178B7527:
Q: How does the 178B7527 frequency converter manage rapid torque demand during heavy-load startups?
A: It delivers high breakaway torque with a boosted current response in under a second. This behavior ensures the motor drives through initial inertia without stalling or delay.
Q: What makes the Danfoss 178B7527 suitable for precise motor ramp control in variable-speed applications?
A: Its configurable ramp times range from 1 to 3600 seconds, offering smooth transitions. This supports flexible speed profiles in systems with delicate or shifting load conditions.
Q: How does the 178B7527 frequency converter maintain frequency accuracy during critical control adjustments?
A: Its resolution of ±0.003 Hz across a wide operating range ensures tight frequency control. This allows highly responsive motor tuning under automated feedback systems.
Q: What installation factors must be considered when wiring the 178B7527 frequency converter for maximum current capacity?
A: It supports dual 70 mm² or 2x2/0 mcm cables for motor and DC bus terminals. This allows secure connections for high-current flow and minimizes losses under full load.
Q: How does the 178B7527 frequency converter perform in applications with aggressive short circuit risk?
A: It withstands short circuit currents up to 100,000 A at the mains input. This enhances durability and protects upstream components in fault-prone industrial environments.
