A technique used in some variable-frequency drives featured in some other Hitachi inverter model families to rotate the force vector in the motor without the use of a shaft position sensor angular. The output logic is active low, and is the open collector type switch to ground. The inverter has a programmable watchdog timer to monitor network activity. Query - A frame sent from the external control equipment to the inverter Response - A frame returned from inverter to the external control equipment The inverter returns the response only after the inverter receives a query from the external control equipment and does not output the response positively. All the drives I own are very similar in programming and setup. Benefits include an increase in torque at the lowest speed and the cost savings from the lack of a shaft position sensor.
First, use B013 to select the torque characteristic that matches your load. So it looks like these can do way, way more than I require! You can connect a single braking unit to the inverter, or two braking units for Braking additional braking torque. You can select any two of the other nine intelligent output options for internal inputs use C141 and C142. The right-most column of the tables is blank, so you can record values you have changed from the default. Parameter P044 sets the time-out period. Select termination resistors that match the characteristic impedance of the network cable.
Voltage gain — Using parameter A045 you can modify the voltage gain of the inverter see graph at right. When a fault occurs, the inverter stores important performance data at the moment of the fault. Verify the contents of the box include: a. After removing the front housing partitions that cover the power and motor. These preset frequencies are selected by means of digital inputs to the inverter. If the optional remote operator is used and the retry function has been selected, this will also cause automatic restarting when a Run command is active.
You must manually set H003 and H004 values to match the motor. Otherwise, there is the danger of fire. Is the load too heavy? The circuit diagram below shows the inverter wiring for performing the megger test. How can I know if my application require any of these options? The overload detection circuit Regeneration C041 operates during powered motor operation and during regenerative braking. Take measures to minimize interference that is frequently coupled in through installation cables. The motor speed will not Heavy loads activate the reach the target frequency overload restriction feature.
You are working with high voltages and high-frequency switching waveforms that are not pure sinusoids. Automatic Restart Mode The restart mode determines how the inverter will resume operation after a fault causes a trip event. The right-most column of the tables is blank, so you can record values you have changed from the default. However, when finding an error in the query, the inverter returns an exception response. The various functions are separated into related groups identifiable by the left-most character, as the table shows. Note: The emergency stop function does not electrically shut off the inverter but merely stops the switching operation of the main circuit elements. Hitachi inverters use state-of-the- art semiconductors to provide high performance and reliability in a compact package.
The table legend is given below. I've come to learn this about him over the years. Detailed description of these functions, related parameters and settings, and example wiring diagrams are in page 4-8. This will prevent a power supply contention in case the short bar is accidentally placed in the incorrect position. Use B031 to select from various protection levels.
Threshold The parameter C041 sets the overload C041 Power running threshold. Several options related to electrical noise suppression are available for the Hitachi inverters. Disconnect incoming power before working on this control. When the data is locked, the keypad keys cannot edit inverter parameters. I do not oversize them. Single and three-phase models are available from 0. Each inverter accessory comes with its own printed instruction manual.
Otherwise, there is the danger of electric shock. List of Holding Registers Func. I try and size my drives for the intended motor load. The coil data is a single bit binary value. Bob in Oregon Hi Bob. You can search our extensive inventory in several ways using the drop down menu boxes to the left on your screen. When the fault is cleared the alarm signal becomes inactive.
This can be useful if the installation is subject to input voltage fluctuations. The parameter C041 sets the overload threshold. Coil Number - The network single bit binary value. The overload detection circuit operates during powered motor operation and during regenerative braking. D001 Output frequency Real-time display of output 1002h 0 to 4000 0.
To access the data, use the monitor functions Dxxx and select D081 for details about the present fault En. Hitachi inverters feature auto tuning to determine motor parameters for optimal commutation. We suggest that you first scan through the listing of inverter functions to fain a general familiarity. You can select any two of the other nine intelligent output options for internal inputs use C141 and C142. Open Serial Port Cover - The inverter keypad has a hinged dust cover protecting the serial port connector. If two cables intersect one crosses over the other , the interference is smallest if they intersect at an angle of 90°. This chapter will build on that knowledge in the following ways: 1.