178B0655
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The 178B0655 is a 3-phase frequency converter with a bookstyle enclosure and a mains voltage range of 380-500/460-500 V AC. Manufactured by Danfoss, it is part of the VLT 5000 Frequency Converters series and features an IP20 enclosure class. The unit includes a Local Control Panel (LCP) display.
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Product Description:
The 178B0655 is a 3-phase motor control drive from Danfoss that is engineered for precise regulation in heavy duty systems. Its output voltage is adjustable from zero to 100% of input supply and its rated motor voltage matches the supply class of 380 to 500 V at 50/60 Hz. This drive supports ramp adjustments between 0.05 - 3600 sec of time and it offers up to 96% efficiency.
The 178B0655 drive withstands a maximum short circuit rating of 100 kA and its true power factor is 0.90 at rated load, while is varying power factor exceeds 0.98. It allows approximately one switch operation on the mains input every two minutes and delivers start torque at 160% of rated motor torque for one minute. The unit’s braking cycle is 600 sec with 40% continuous duty at 100% torque and 10% at overload torque. It provides eight 0 to 24 V DC programmable digital inputs and its logic low is defined below 5 V, while logic high is above 10 V. The inputs have a scan time of 3 ms and a resistance of 2 kOhms. Its 2 configurable analog voltage inputs accept up to 10 V with 10 kOhm impedance and its one analog current input handles 0 or 4 to ±20 milliamperes with 200 Ohm impedance.
The 178B0655 drive handles 250 V AC at its relay terminals, with a load capacity of 2 A on its normal open (NO) and normal close (NC) points, while it also supports 50 V DC at 1 A, with 50 W load rating. It comes equipped with thermal protection, earth fault monitoring, motor phase loss detection and DC bus supervision for reliable operations. The unit’s control signal resolution is 10-bit, with maximum error of 1%.
Frequently Asked Questions about 178B0655:
Q: Why does the 178B0655 drive support both push-pull and open collector encoder inputs?
A: Its push-pull allows higher speed feedback up to 65 kHz, while open collector supports simpler integration up to 20 kHz. This flexibility improves compatibility with different encoder types.
Q: What is the advantage of thermal protection in the 178B0655 drive?
A: It prevents overheating by shutting down the unit under excessive temperature. This safeguards both the drive and connected motor from thermal damage.
Q: How does DC bus supervision in the 178B0655 improve system reliability?
A: It continuously monitors bus voltage levels to detect abnormalities. This feature helps avoid DC link failures and ensures safe motor control.
Q: Why is scan time of 3 milliseconds important for digital inputs?
A: Its fast scan time ensures real-time response to control signals. This is especially useful in high-speed automation processes requiring rapid switching.
Q: Why does the relay output in 178B0655 support both AC and DC loads?
A: This dual capability increases flexibility in controlling external devices. It allows integration with different electrical systems without requiring additional relays.
