Acceleration/deceleration time Selectable from among acceleration/deceleration times 1 and 2 (0.0 to 3000 sec.).
Automatic acceleration/deceleration function. S-pattern acceleration/deceleration
1 and 2. Control of forced rapid deceleration.
DC braking Braking start-up frequency: 0 to maximum frequency, braking rate: 0 to 100%,
braking time: 0 to 20 seconds, emergency DC braking.
Dynamic Breaking Drive Circuit None (braking module is optional)
Input terminal function (programmable) Possible to select from among about 60 functions, such as forward/reverse
run signal input, jog run signal input, operation base signal input and reset signal input,
to assign to 5 input terminals. Logic selectable between sink and source.
Output terminal functions (programmable) Possible to select from among about 40 functions, such as upper/lower limit frequency signal output, low speed detection signal output, specified speed reach signal output and failure signal output, to assign to FL relay output, open collector output terminals.
Forward/reverse run The RUN and STOP keys on the operation panel are used to start and stop operation, respectively. Forward/reverse run possible through communication and contact inputs from the terminal block.
Jog run Jog mode, if selected, allows jog operation from the terminal board.
Preset speed operation Base frequency + 15-speed operation possible by changing the combination of 4 contacts on the terminal board.
Retry operation Capable of restarting automatically after a check of the main circuit elements in case the protective function is activated. 10 times (Max.) (selectable with a parameter)
Various prohibition settings / Password setting Possible to write-protect parameters and to prohibit the change of panel frequency settings
and the use of operation panel for operation, emergency stop or resetting.
Possible to write-protect parameters by setting 4 digits password.
Regenerative power ridethrough control Possible to keep the motor running using its regenerative energy in case of a momentary
power failure (default: OFF).
Auto-restart operation In the event of a momentary power failure, the inverter reads the rotational speed of the coasting motor and
outputs a frequency appropriate to the rotational speed in order to restart the motor smoothly.
This function can also be used when switching to commercial power.
Failure detection signal 1c-contact output: (250 V ac - 2 A (cosO=1): At resistive load, 30 V dc -1 A, 250 V ac - 1 A (cosO=0.4))
Protective function Stall prevention, current limitation, over-current, output short circuit, over-voltage, over-voltage limitation,
undervoltage, ground fault, detection, power supply phase failure, output phase failure,
overload protection by electronic thermal function, armature over-current at start-up, load side over-current at start-up,
over-torque, undercurrent, overheating, cumulative operation time, life alarm, emergency stop, braking resistor
overcurrent/ overload, various pre-alarms
Electronic thermal characteristic Switching between standard motor and constant-torque VF motor, switching between motors 1 and 2,
setting of overload trip time, adjustment of stall prevention levels 1 and 2, selection of overload stall
Reset function Function of resetting by closing contact 1a or by turning off power or the operation panel.
This function is also used to save and clear trip records.
Alarms Stall prevention, overvoltage, overload, under-voltage, setting error, retry in process, upper/lower limits
Causes of failures Over-current, overvoltage, overheat, short-circuit in load, ground fault, overload on inverter,
over-current through arm at start-up, over-current through load at start-up, CPU fault, EEPROM fault,
RAM fault, ROM fault, communication error. (Selectable: emergency stop, under-voltage, small current,
over-torque, motor overload, input phase loss, output phase loss)
Monitoring function Operation frequency, operation frequency command, forward/reverse run, output current, input voltage,
output voltage, torque, torque current, load factor of inverter, input power, output power,
information on input terminals, information on output terminals, version of CPU1, version of CPU2,
PID feedback value, frequency command (after compensation), causes of past trips 1 to 4, parts replacement alarm,
cumulative operation time
Past trip monitoring function Stores data on the past four trips: number of trips that occurred in succession, operation frequency,
direction of rotation, load current, input voltage, output voltage, information on input terminals,
information on output terminals, and cumulative operation time when each trip occurred.
Output for frequency meter Analog output for motor: 1 mA dc full-scale dc ammeter 0 - 20 mA (4 to 20 mA) output:
DC ammeter (allowable load resistance: Less than 750 ohm) 0 - 10 V output:
DC voltmeter (allowable load resistance: Over 1 k ohm) Resolution: Maximum of 1/255
4-digit 7-segments LED Frequency: inverter output frequency. Alarm: stall alarm "C", overvoltage alarm "P",
overload alarm "L", overheat alarm "H". Status: inverter status (frequency, cause of activation of protective function,
input/output voltage, output current, etc.) and parameter settings. Free-unit display: arbitrary unit
(e.g. rotating speed) corresponding to output frequency.
Indicator Lamps indicating the inverter status by lighting, such as RUN lamp, MON lamp, PRG lamp, % lamp, Hz lamp.
The charge lamp indicates that the main circuit capacitors are electrically charged.
Location of use Indoors; not exposed to direct sunlight, corrosive gas, explosive gas, flammable gas,
oil mist, or dust; and vibration of less than 5.9 m/s2 (10 to 55 Hz).
Elevation 3000 m or less (current reduction required over 1000 m) Note 5)
Ambient temperature -10 to +60 degreeC Note)2.3.
Storage temperature -25 to +70 degreeC
Relative humidity 5 to 95% (free from condensation and vapor).
Note 1) Be careful, if 4-20 mA is selected, when the inverter's power is ON, the internal impedance is 250 ohm, but when the power is OFF,
the internal impedance increases very much to approximately 40 k ohm.
Note 2) Above 40 degreeC : Remove the protective seal from the top of VF-nC3. If the ambient temperature is above
50 degreeC: Remove the seal from the top of the inverter and use the inverter with the rated output current reduced.
Note 3) If inverters are installed side by side (with no sufficient space left between them): Remove the seal from the top of each inverter.
When installing the inverter where the ambient temperature will rise above 40 degreeC, remove the seal from the top of the inverter and
use the inverter with the rated output current reduced.
Note 4) For a side-by-side installation, remove the seal on top. However, in areas where the ambient temperature exceeds 40 degreeC,
remove the seal on top and reduce the rated output current.
Note 5) Current must be reduced by 1% for each 100 m over 1000 m. For example, 90% at 2000 m and 80% at 3000 m.
Easy to set parameters
O Showing most frequently used parameters In easy mode.
EASY key allows you switch between Easy mode and Standard mode.
Easy mode : Scrolls through a list of only seven parameters.
You can optionally add up to 24 parameters to the list
Standard mode : Rotates through all parameters.
8 Guides you step by step throush parameters you need to sat up.
Since the guidance feature shows one parameter at a time
according to the selected function. you can interactively edit its value.
Auto-guidance function is available with motor parameter setup,
preset speed selection and analog signal control, etc.
8 Searchlns for a history of chansea In history function.
History function makes change of parameter setting easily when some
parameters are repeatedly set by the trial run and the adjustment.etc ...
History function automatically searches for 5 latest parameters that
are set with different values from the standard default setting.
0 Searching and raaettlns of changed parameters.
User parameter group, Gr U, automatically seaches for only those parameters
that are set with different values from the standard default setting and
This function makes the parameter setting check and resetting easily.
Built-in RS485 communication
Built-in RS485 communication enable to control the inverter and build network.
0 Communication rate : 38.4 kbps max.
O Compatible with the Modbus RTU and Toshiba protocols.
You can connect a PC to manage parameters and monitor operating conditions.
The vertically oriented main circuit terminal block
allows easy wiring.
* The Hturn-and-push" setting dial
makes setup easily.
* The large setting dial at the center
of the front panel allows you set the
parameters easily. Just turn the
setting dial until you get the right
parameter and push the setting
dial to select.
You can also use the setting dial
to set the reference freciuency.
* The RUN and STOP keys allow to
You can operate the inverter with
the I RUN I and ISTOP I keys on the
front panel. The front cover may
be closed to conceal the other
keys to avoid accidental pressing.
The Extension panel option allows
to operate the
VF-nC3 in front of the cabinet.>>
* An extension panel option
installed on the surface of the
cabinet can operate
the VF-nC3 in front of the cabinet.
It is possible to monitor the output
freciuency on the VF-nC3 and
the output current
on the extension panel option
* (RKP007Z). It is possible to use
it as a digital meter.
•The extension panel option ls connected to the Inverter with the optional cable.
In the extension panel option. there is no setting dial
Principal control functions
Control system Sinusoidal PWM control
Related output voltage Adjustable within the range of 50 to 330V by correcting the supply voltage
(However, cannot output voltage exceeding the input voltage.)
Output frequency range 0.1 to 400.0Hz, default setting: 0.5 to 80Hz, maximum frequency: 30 to 400Hz
Minimum setting steps of frequency 0.1Hz: analog input (when the max. frequency is 100Hz),
0.01Hz: Operation panel setting and communication setting.
Frequency accuracy Digital setting: within +/-0.1% of the max. frequency (-10 to +60 degreeC)
Analog setting: within +/-1.0% of the max. frequency (25 degreeC +/-10 degreeC)
Voltage/frequency characteristics V/f constant, variable torque, automatic torque boost, vector control, automatic energy-saving.
Auto-tuning. Base frequency (20 - 400Hz) adjusting to 1 or 2, torque boost (0 - 30%)
adjusting to 1 or 2, adjusting frequency at start (0.1 - 10Hz)
Frequency setting signal Setting dial on the front panel, external frequency potentiometer (connectable to a potentiometer
with a rated impedance of 1 - 10k ohm), 0 - 10Vdc / 0 - 5Vdc (input impedance: VI=40k ohm),
4 - 20mAdc (Input impedance: 250 ohm). Note 1
Terminal board base frequency The characteristic can be set arbitrarily by two-point setting. Possible to set: analog input (VI).
Frequency jump Setting of the jump frequency and the range.
Upper- and lower-limit frequencies Upper-limit frequency: 0 to max. frequency, lower-limit frequency: 0 to upper-limit frequency
PWM carrier frequency Adjustable range of 2 to 16Hz (default: 12kHz).
PID control Setting of proportional gain, integral gain, differential gain and control wait time.
Checking whether the amount of processing amount and the amount of feedback agree.
Toshiba VF-nC3 ac dirve
Smart , compact , economy
Like power distribution devices,
the main circuit terminal block of the VF-nC3
is vertically oriented to make wiring easy
and minimize tangles of cable.
Side-by-side installation for space-saving
Generally, inverters must be placed in
consideration of radiation of heat.
The VF-nC3 can be placed side by side
with no gap,
saving inside of control panel space."1
Easy mode Standard mods