DC braking | Toshiba VF-FS1 guide

E6581381

6.7DC braking

6.7.1DC braking

H : DC braking starting frequency

H : DC braking current

H : DC braking time

•Function

A large braking torque can be obtained by applying a direct current to the motor. These parameters set the direct current to be applied to the motor, the application time and the starting frequency.

	[Parameter setting]
	Title	Function	Adjustment range	Default setting
	H	DC braking starting frequency	0.0-HJ (Hz)	0.0
	H	DC braking current	0-100 (%) / (A)	50		6
	H	DC braking time	0.0- 20.0 (sec)	1.0		6
	H	DC braking time	0.0- 20.0 (sec)	1.0

Output frequency [Hz]

Set frequency

DC braking

	DC braking starting frequency
	H
	0	Time [s]
	Output current [A]	Time [s]
	Output current [A]
			DC braking current
			H
	0
		DC braking time	H

Operation signal (F or R)

ON OFF

Note1: During DC braking, the overload protection sensitivity of the inverter increases. The DC braking current may be adjusted automatically to prevent tripping.

Note 2: During DC braking, the carrier frequency is 6kHz irrespective of the setting of parameter H (PWM carrier frequency).

F-23

Image 119

Toshiba VF-FS1 instruction manual DC braking

Contents

Industrial Inverter Page Explanation of markings Safety precautionsMeanings of symbols Safety precautions General Operation Wiring Transportation & installation Operations Maintenance and inspection When retry function is selected inverter Attach warning labels Disposal II. Introduction Features  Contents  E6581381 Iii Check product purchase Read first Contents of the product Outside view Names and functions Bottom Power circuit terminal board Power circuit and control circuit terminal boards VFFS1-2004 ∼ 2037PM VFFS1-4004 ∼ 4055PL E6581381 E6581381 Grounding capacitor disconnecting switch and taps AWG Control circuit terminal board How to open the front terminal board cover-18.5kW or less How to open the front terminal board cover-22kW or More Motors Load that produces regenerative torque Braking a motor when cutting off power supplyLow loads and low inertia loads Occurrence of instability Protecting inverters from overcurrent InvertersBraking motor Measures to protect motors against surge voltages MCCB1 Power factor correction capacitorIf power supply distortion is not negligible Operating at other than rated voltage Elcb What to do about the leak currentEffects of leak current across ground Remedies Affects of leakage current across lines Installation environment Installation 5cm Standard installation Side-by-side installation How to install Operating motor Calorific Values w Installing more than one unit in a cabinet Page Connection Preventing radio noise Control and main power supplyWiring Standard connections Standard connection diagram Standard connection diagram Description of terminals Power circuit terminals Control circuit terminals Power circuitControl circuit terminals VIB VIA FLC FLAFLB PLC Logic switching Operations Hoqf Simplified Operation of the VF-FS1Eoqf Coast stop How to start and stopExample of a Eoqf setting procedure Start and stop using the operation panel keys EOQF= HOQF How to set the frequencyExample of a Hoqf setting procedure Example of operating a run from the panel Frequency setting Setting the frequency using the operation panel HOQF= or How to operate the VF-FS1 Mccb Page Basic VF-FS1 operations Setting monitor mode Mode for setting inverter parametersMode for monitoring all inverter status Flow of status monitor mode Basic parameters Extended parameters User parameters How to set parameters Changes the parameter setting Saves the changed value How to set the basic parameters How to set extended parameters ITW Search and resetting of changed parameters I4WExample of parameter setting How to search and reprogram parameters HTH Setting a parameter, using the wizard function CWHCEE How Parameters of Quick setting wizard How to use the wizard function Jgcf How to use the history functionCWJ CW Parameters that cannot be changed while running Kpkv Returning all parameters to standard default settingHow to save/load the user setting parameters Page Automatic acceleration/deceleration Setting acceleration/deceleration timeBasic parameters CWK Manually setting acceleration/deceleration timeMethods of setting automatic acceleration/deceleration Function Adjustment range Default setting UP/DOWN HOF Specifying an operation mode, using parametersUP/DOWN EOF RES PLC VIA VIB OFF Setting mode Switching of commands and references Selection of operation mode Command mode selection Preset-speed operation Frequency setting mode selection Houn Meter setting and adjustmentHoun Meter selection HO Meter adjustment HOUN= VF-FS1 ResolutionAdjustment scale with parameter HO Meter adjustment HOUN= Adjusting the meter in inverter stop state Programmed value Standard default settingVR Default setting E6581381 HT Forward/reverse run selection Operation panel operation Forward/reverse run selection Operation panel operation WN Upper limit frequency NN Lower limit frequency Maximum frequencyUpper limit and lower limit frequencies HJ Maximum frequency XN Base frequency XNX Base frequency voltage Base frequency RV V/F control mode selection Selecting control mode Setting for fans and pumps Constant torque characteristics Motor constant must be set Increasing starting torque Operating a permanent magnet motor Precautions on vector control+ Motor constant must be set Energy-saving E6581381 Valid, Invalid XD Torque boost Setting the electronic thermalManual torque boost increasing torque boost at low speeds QNO Motor electronic thermal protection level Setting value Overload protection Overload stall Motor 150%-overload time limit H Inverter over load characteristics Thermal memory selection H Preset-speed operation speeds in 7 stepsUT UT Preset-speed operation frequencies UT UTUT UT Below is an example of 7-step speed operation Input/output parameters Low-speed signal Low-speed signal output frequency Extended parameters Speed reach detection band Output of designated frequency reach signal Designated frequency Output of set frequency speed reach signal VIA terminal function selection Input signal selectionChanging the functions of VIA terminal Modifying input terminal functions Terminal function selectionKeeping an input terminal function always active on Setting of contact input terminal function Connection with transistor output Connection method 1 A-contact input Examples of application Modifying output terminal functionsSink Negative logic / Source Positive logic input RY RC Assigning two functions to an output terminalAssigning one function to an output terminal RY-RC Hdry Holding the output of signals in on statusInput terminal function FLA-FLB-FLC Comparing the frequency command values Basic parameters Switching motor characteristics via terminal input AD2 VF2 MOT2 OCS2 OFF Setting of switching terminalsFrequency priority selection Automatic switching by frequency command External switching Input terminal function 38 Fchg enabled Setting frequency command characteristics VIA, VIB terminals 10Vdc voltage input adjustment VIA, VIB Setting of frequency with the input from an external contact Adjustment with pulse signals Parameter-setting example Sample sequence diagram 1 Adjustment with continuous signals About the change of the initial up/down frequency About the setting of the initial up/down frequencyFrequency adjustment range Minimum unit of frequency adjustment Fine adjustment of frequency setting signal Starting frequency 2 Run/stop control with frequency setting signals Starting frequency setting Operation frequency DC braking DC braking OFF Jump frequency jumping resonant frequencies Bumpless operation selection Bumpless operation PWM carrier frequency 0.75kW 15kW E6581381 Auto-restart control selection Trip-less intensificationAuto-restart Restart of coasting motor Motor speed search at starting Restarting motor during coasting Motor speed search function Instantaneous power failure coast stop selection Instantaneous power failure coast stop selection Retry selection Selecting the number of times Retry function E6581381 Avoiding overvoltage tripping Output voltage adjustment/Supply voltage correction Reverse-run prohibition Canceling the operation command  Droop gain  Droop insensitive torque band Droop control E6581381 External connection Conducting PID control Types of PID control interfaces Setting PID controlAdjusting the PID control gain level I-gain adjustment parameter P-gain adjustment parameter Setting the time elapsed before PID control starts D-gain adjustment parameterAdjusting analog command voltages Setting motor constants Setting motor constants Set the auto-tuning parameter H to Auto-tuning enabled E6581381 Setting motor constants 2 Details E6581381 Selecting an acceleration/deceleration pattern Acceleration/deceleration time Switching acceleration/deceleration time 1 E6581381 Protection functions Setting motor electronic thermal protection Stall prevention level Setting current stall Inverter trip retention selection Inverter trip retention Emergency stopping from the operation panel Emergency stop Emergency stop Emergency DC braking time External trip stop via terminals Output phase failure detection mode selection Output phase failure detection Input phase failure detection mode selection Input phase failure detectionControl mode for small current Detection of output short-circuit during start-up Detection of output short-circuit Over-torque trip OFF On OFF Over-voltage stall protection level Cumulative operation time alarm setting Cumulative operation time alarm setting Over-voltage stall protection level Undervoltage trip Undervoltage trip/alarm selection Trip at VIA low level input mode Trip at VIA low level input modeParts replacement alarms Motor PTC thermal protection Evasion from Overvoltage and Imput phase failure NNWN Forced fire-speed control function Calibration of analog outputs Adjustment parametersExample of setting Operation panel parameter Prohibition of key operations and parameter settingsResetting method Current / voltage unit Changing the unit to a An example of setting when HJ is 80 and H is Free pressing a panel key once Free panel display When H is not 0.00, and H is not 0 disabledChanging the steps in which the value displayed changes Standard monitor display selection Changing the item displayed by defaultChanging the display format while power is on Selection of operation panel stop pattern Integral output powerSelection of operation panel stop pattern Display of the head of the parameters Title Communication rate Setting of common functionError by disconnection Communication function Common serial Communication function parameters Common serial options E6581381 Example of connection for RS485-communication Using the RS485Setting the communication functions Transmission specifications Wiring Permanent magnetic motors Parameters for optionsPage HOQF Setting the operation frequencyApplied operation HOQF Hoqf P24Hoqf PLC VIA SS3 VIB RES RES SC/LC Setting the operation mode RES SC/LC PLC VIA VIB LED Status monitor modeMonitoring the operation status Status monitor under normal conditions VIA RES KK Pgtt ⇔ Display of detailed information on a past trip Display of trip information Display of trip informationTrip code display Example of call-up of trip information Display of trip information at the occurrence of a trip Input terminal KK FE06 OFF Cause of the trip is displayed E6581381 Page About the EMC directive How to cope with the CE directiveMeasures to satisfy the standards Measures to satisfy the EMC directive Three-phase 400V class About the low-voltage directive Example of wiring Compliance with Connection Compliance with InstallationCompliance with UL Standard and CSA Standard Measures to satisfy the low-voltage directive AIC a AIC, Fuse and Wire sizesMotor thermal protection Peripheral devices Selection of wiring materials and devices Input current a Selection of wiring devices Magnetic contactor in the primary circuit Installation of a magnetic contactor Magnetic contactor in the secondary circuit Installation of an overload relay Optional external devices Page 11.2 Basic parameters Table of parameters and data11.1 User parameters Houn UT Input/output parameters Extended parameters Frequency parameters NNWN Operation mode parameters Torque boost parameters Protection parameters Acceleration/deceleration time parameters Operation panel parameters Output parameters Communication parameters PM motor parameters Default settings by inverter rating AD2 Table of input terminal functions OHN LLN Table of output terminal functions UCN Pidfn Order of precedence of combined functions Standard specifications SpecificationsModels and their standard specifications Common specification Display Outside dimensions and mass Outside dimensions and mass Fig.A Outline drawing Fig.E Trip causes/warnings and remedies Before making a service call Trip information and remedies QR GTT QHH Restoring the inverter from a trip If the motor does not run while no trip message is displayed How to cope with parameter setting-related problems How to determine the causes of other problemsPage Regular inspection Inspection and maintenance Check items Periodical inspectionCheck points Replacement of expendable parts Standard replacement cycles of principal parts Keeping the inverter in storage Making a call for servicingPage Warranty Disposal of the inverter Page Toshiba