178B1656
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MPN: FCD305PT4P66STR1DCF00T52C0
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The 178B1656 is a compact micro drive with an IP66 enclosure class and a power rating of 0.55 kW. Manufactured by Danfoss in their FCD 300 Micro Drives series, it operates on three-phase power with a mains voltage of 380-480 V and a supply frequency of 50/60 Hz. Weighing 5.8 kg, it features a display connector and conforms to EN 55011 Class A1 standards.
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Product Description:
The 178B1656 Adjustable Speed Drive is designed to provide accurate motor control with consistent protection functions. It offers safety against short circuits, motor overvoltage and supply harmonics. Its tested compatibility with screened and unscreened motor cables enables flexibility.
This 178B1656 adjustable speed drive from the FCD 300 series includes short circuit protection on terminals U, V and W. Any short circuit between two motor terminals leads to overcurrent in the IGBT module that forces all transistors to cut out independently. The inverter then shuts down within 5 – 10 microseconds while a fault code is displayed depending on impedance and motor frequency. For motor-generated overvoltage, the drive disconnects the IGBT module once a set voltage level is reached. The overvoltage situations arise when the load drives the motor or during ramp down with high inertia where excess energy cannot dissipate quickly. The unit attempts to adjust ramp speed to maintain stability. The drive has been tested with both 10 m unscreened cables and 10 m screened cables. Its design ensures optimal use with cables of rated cross section. The drive maintains efficiency regardless of shaft load whether at 100 % torque or part load at 75 %. The performance does not change with different U/f settings though these characteristics directly affect motor efficiency.
The 178B1656 adjustable speed drive from Danfoss absorbs non sinusoidal current that increases RMS input demand. The unit supports one analogue voltage input at terminal 53. This input is scalable within a voltage range of ± 0 – 10 V DC. The input resistance is approximately 10 kΩ with a maximum voltage tolerance of 20 V. These values ensure stable signal handling for accurate drive control.
Frequently Asked Questions about 178B1656:
Q: How does the Danfoss 178B1656 adjustable speed drive respond to short circuit events across motor terminals?
A: It monitors U, V, and W terminals for fault current and reacts within 5–10 microseconds. The IGBT module shuts down immediately, and a fault code appears based on impedance and frequency.
Q: What behavior can be expected from the 178B1656 drive during regenerative overvoltage caused by load-driven motors?
A: When overvoltage is detected, the IGBT module disconnects at a predefined threshold. The unit adjusts ramp-down speed to stabilize the system under high-inertia braking conditions.
Q: How does the 178B1656 drive ensure control accuracy using the analog voltage input at terminal 53?
A: It offers a scalable ±0–10 V input range with 10 kΩ resistance, allowing precise signal mapping. This setup maintains reliable control under varying process demands.
Q: Does the Danfoss 178B1656 maintain energy efficiency under varying shaft loads and torque demands?
A: It operates consistently from full torque down to partial load without efficiency loss. U/f settings influence motor performance but do not impact drive-side efficiency.
Q: What cable compatibility does the 178B1656 adjustable speed drive offer for flexible installation?
A: It has been validated with both screened and unscreened 10 m motor cables. The design supports full performance using standard cross-sectional ratings across both cable types.
