175Z4188
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The 175Z4188 is a compact frequency converter with a power rating of 37 kW and IP20 enclosure class. Manufactured by Danfoss as part of the VLT 5000 Frequency Converters series, it supports three-phase operation and a mains voltage of 380-500/460-500V AC. This model features a Local Control Panel for operation.
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Product Description:
The 175Z4188 is an industrial grade adjustable drive from Danfoss that operates on a 3-phase supply of 380 to 500 V ±10% at 48 to 62 Hz frequency. Its maximum short circuit withstanding capability is specified as 100000 A and its output frequency range extends from 0 to 132 hertz in standard mode, up to 1000 hertz.
The 175Z4188 drive features indefinite switching on the output and its control resolution is ±0.003 Hz on frequency, while its system response time is 3 msec. It provides 160% of starting up torque for 60 sec and it can facilitate up to 180% of torque for 0.5 sec. The unit’s acceleration torque is 100% of motor rated torque and it offers overload torque of 160% in high overload class, while 110% in normal overload. Its closed loop control maintains 100% torque at zero speed. The 175Z4188 drive is composed of eight digital inputs that are programmable and operates at 0 to 24 V DC. It also includes two analog voltage inputs with a range of ±10 V and 10000 Ohm resistance. The encoder and pulse inputs are accepted with frequencies up to 20000 Hz on open collector and up to 65000 Hz on push pull signals. Two outputs are configurable for digital/analog signals and its relay outputs are rated up to 250 V AC for a load capacity of 2 A at its NO/NC points.
The 175Z4188 drive supports screened motor cable lengths of up to 150 meters and unscreened cable lengths up to 300 meters. Its environmental specifications include enclosures of chassis, NEMA 1/NEMA 12 and its protective functions cover electronic thermal motor protection as well as heat sink over temperature cut out. The drive’s EMC compliance meets EN 61000 and IEC standards with immunity to surge, burst and static discharge.
Frequently Asked Questions about 175Z4188:
Q: Why is the 100000 A short-circuit withstand rating significant for the 175Z4188 drive?
A: A high short-circuit withstand capability ensures the drive survives fault currents without damage, improving safety and reducing downtime. For the 175Z4188 drive, this rating supports robustness in industrial networks prone to surges.
Q: What advantage does operating up to 1000 Hz (versus standard 132 Hz) offer in the 175Z4188 drive?
A: The higher output frequency allows very high speed operation or fine control of rapid accelerations, useful for applications like machining spindles or high-speed fans. The 175Z4188 drive uses this extended range to maintain control resolution under extreme speed demands.
Q: What is the benefit of having both open collector and push-pull encoder inputs with different maximum frequencies in the 175Z4188 drive?
A: It support for both types allows flexibility in using different encoder technologies; push-pull inputs up to 65,000 Hz provide high resolution, open-collector up to 20,000 Hz are suitable for simpler systems. This flexibility in the 175Z4188 drive helps integrate with existing encoders without needing custom hardware.
Q: How does the acceleration torque of 100% rated torque in the 175Z4188 drive impact motor sizing?
A: The full rated torque during acceleration, motors need not be oversized for transient loads, which saves cost. The 175Z4188 drive’s 100% acceleration torque ensures smooth ramping without compromising motor thermal limits.
Q: Why are screened motor cables limited to 150 m while unscreened allowed up to 300 m in the 175Z4188 drive spec?
A: The screened cables reduce electromagnetic interference but increase capacitance and leakage current, which can degrade performance over long runs. The 175Z4188 drive accounts for this by imposing a lower maximum length for screened cable to keep signal integrity and EMC compliance.
