2004年2月22日 · Resistor wattage is based on duty cycle and load inertia. If your load consists of a loaded conveyor belt with tons of material on it then you need a honkin' big resistor to blot up the energy stopping it. A machine tool braking resistor rarely need to be rated over 15% of full load wattage. [ 03-25-2007, 11:01 AM: Message edited by: Forrest Addy ]

2010年7月4日 · The VFD I have has the option of adding a braking resistor. When looking at the data plates of the Siemens motor it shows a Brake (Bremse). I'm assuming that this is some other form of brake and not a resistor that the VFD is looking for.

2015年5月17日 · The relay output is limited to 0.3A below, reason why it needs to operate a coil of a relay/contactor if operating the electro-mechanical brake. Brake resistor for that VFD model would be FR-ABR-7.5K High-duty brake resistor - 3-phase (3P) 200V class - Mitsubishi Electric - 7.5kW / 10HP - Resistance 20Ω, looks to be around 1kW dissipation.

2018年5月18日 · I repaired the brake on my HLV AND added vfd braking resistor. It stops very quickly on the VFD brake but the friction brake is not nearly as effective. I have two VFD's with DC braking (the HLV also has it) and both of them default to 0.5s (when enabled) with a maximum of 5 seconds I think, along with a maximum frequency it gets invoked at ...

2018年1月11日 · There are NO adjustments for the Dynamic Brake turn on voltage. You can tell if the Brake IGBT is being commanded to be ON by looking at parameter 10.11 . . . if it is OFF and the resistor is seeing voltage / current, the IGBT is shorted out …

2004年4月1日 · The instantaneous power can be several kilowatts, put into in some cases a resistor with 250W long term dissipation capability. It's teh duty cycle that fixes the problem. otherwise they would melt. braking just isn't a large percentage of the time, so the resistor isn't on long, and only needs a good short term overload capability.

2014年5月17日 · 15hp 230v 3ph motor typ. 40amp. so 80 amp needed. to suck out 80 amp from vfd, you need maxR=v/i=400vdc/80a= 5 ohm. if ur drive can ony use 30ohm min, u can pull only 400/30=13 amp peak - or about 3hp worth of stopping power. 3 hp is typ 9 #-ft.... 2) rms wattage rating of resistor = this determines HOW OFTEN you can stop, not how fast u can.

2011年3月10日 · As for the resistor, figure the brake IGBT is good for maybe 1/3 to 1/2 what the main ones are good for. 3 HP is about 10A, 240V, so figure 3A or so, which suggests about 100 ohms minimum. Hopefully that is conservative.

2012年10月2日 · A VFD is perfectly fine braking if it can do it without overcurrent. And that depends on how much mass is spinning. The more mass, the harder it is to stop fast, and the more current it takes, as well as the more dump load is needed (brake resistor). Most VFDs can use as much dump load as they can handle current-wise while braking.

2009年4月23日 · So you cannot apply a T2 VFD resistor rating to a TT4 VFD resistor rating, as they operate at different voltages. I would recommend a 50 ohm braking resistor which is a common size, the other issue will be the rated voltage for the braking resistor will need to be in the minimum 800V range. The one below is rated at 50 ohms, 600W and 2.8kV.