Toshiba VF-nC1 User Manual Page 19
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E6581090
A-10
1
Loads that generate negative torque
When combined with loads that generate negative torque the protection for overvoltage and
overcurrent on the inverter will go into operation and may cause a trip. For this kind of situation,
you must install a dynamic braking resistor, etc. that complies with the load conditions.
Motor with brake
If a motor with brake is connected directly to the output side of the inverter, the brake will not
release because voltage at startup is low. Wire the brake circuit separately from the motor's
main circuits.
Circuit configuration 1 Circuit configuration 2
MC1
MC2
B
P15
FM/
OUT
Three-phase
power supply
MC3
MC2
MC1
MC2
B
IM
MC3
MC1
MC3
FLB FLC ST CC
Three-phase
power supply
MC2
IM
RY
＋―
RY
In circuit configuration 1, the brake is turned on and off through MC2 and MC3. If the circuit is
configured in some other way, the overcurrent trip may be activated because of the locked rotor
current when the brake goes into operation. Circuit configuration 2 uses low-speed signal
FM/OUT to turn on and off the brake. Turning the brake on and off with a low-speed signal may
be better in such applications as elevators. Please confer with us before designing the system.
1.4.2 Inverters
Protecting inverters from overcurrent
The inverter has an overcurrent protection function. However because the programmed current
level is set to the inverter's maximum applicable motor, if the motor is one of small capacity and
it is in operation, the overcurrent level and the electronic thermal protection must be readjusted.
If adjustment is necessary, see 5-10 in Chapter 5, and make adjustments as directed.
Inverter capacity
Do not operate a large capacity motor with a small capacity (kVA) inverter even with light loads.
Current ripple will raise the output peak current making it easier to set off the overcurrent trip.
Power factor improving capacitors
Power factor improving capacitors cannot be installed on the output side of the inverter. When a
motor is run that has a power factor improving capacitor attached to it, remove the capacitors.
This can cause inverter malfunction trips and capacitor destruction.
Remove the power factor improving
capacitor and surge absorber
Power factor improving capacitor
U
V
W
Inverter
IM
Operating at other than rated voltage
Connections to voltages other than the rated voltage described in the rating label cannot be
made. If a connection must be made to a power supply other than one with rated voltage, use a
transformer to raise or lower the voltage to the rated voltage.
- Industrial Inverter 1
- I. Safety precautions 2
- Danger 4
- Warning 4
- Danger 4
- Warnin 5
- (inverter) 6
- Maintenance and inspection 6
- Disposal 6
- Attach warning labels 7
- ― Contents ― 8
- 1. Read first 10
- [Front panel] 12
- ■Self-up terminal block 13
- VFNC1-2001P～2007P 14
- VFNC1S-1001P～1004P 15
- VFNC1S-2002P～2007P 15
- VFNC1-2015P～2022P 15
- VFNC1S-1007P 16
- VFNC1S-2015P～2022P 16
- VFNC1S-2002PL～2007PL 16
- VFNC1S-2015PL～2022PL 17
- Warning 18
- 1.4.2 Inverters 19
- 1.4.4 Installation 22
- ■Installation environment 22
- Resistor 23
- ■How to install 24
- ■Installation location 24
- 2. Connection 27
- Danger 28
- (1) Sink <common: CC> 29
- Control circuit 30
- 1-phase series 30
- 2.3 Description of terminals 33
- 3. Simple operation 37
- : Motor starts 39
- Motor stops (slowdown stop) 39
- : Moves the frequency up 40
- : Moves the frequency down 40
- ■Frequency setting 40
- 4. Basic VF-nC1 operations 42
- 4.1 How to set parameters 43
- 5. Basic parameters 53
- HO 54
- : Meter adjustment 54
- 5.3 Standard default setting 56
- 5.6 Maximum frequency 58
- 5.8 Base frequency 59
- 5.9 Selecting control mode 59
- 6. Extended parameters 65
- Programmable controller 68
- 6.2.4 Jog run 69
- : Sink/Source selection 69
- 6.3 Basic parameters 2 71
- 6.5 Operation frequency 74
- 6.6 DC braking 75
- Jumping resonant frequencies 76
- ” is displayed 77
- • Function 79
- DC voltage 80
- Overvoltage limiting level 80
- 6.11 Performing PI control 81
- 1710 [min 83
- ] for VFNC1 (S)-□□□□P□ type 83
- 6.14 Protection functions 85
- 6.16.2 Free notes 94
- : Free notes 94
- 7. Variety of operation 95
- Press the 98
- key twice 98
- E6581090 100
- Communication 101
- 9.1.1 Abstract 103
- Inverter 104
- Grounding 104
- 10. Peripheral devices 110
- ■Selection of wiring devices 111
- 11.1 User parameters 113
- 11.2 Basic para meters 113
- 11.3 Extended parameters 115
- 12. Specifications 125
- ■External dimensions/weights 128
- ■External dimensions 128
- Before making a service call 129
- 14.1 Regular inspection 137
- 14.2 Periodical inspection 138
- 15. Warranty 141
- 16. Disposal of the inverter 142
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