YASKAWA VS MINI J7 Spécifications Page 31
- Page / 44
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Peripheral Devices
VS mini J7
32
Installation and selection of molded-case circuit breaker
On the input power side, a molded-case circuit breaker (MCCB) to protect inverter primary wiring should be installed. The inverter power-factor
(depending on power voltage, output frequency, and load) must be taken into account for selecting MCCB. For standard settings, see page 36. If a full
electromagnetic MCCB is to be used, select a larger capacity because the operating characteristics are altered by harmonic current. A leakage current
breaker threshold of 200mA and above, or of inverter (suppressing high frequency) use is recommended.
Use of input side magnetic contactor
The inverter can be used without an input side magnetic contactor (MC). An input MC can be used to prevent an automatic restart after recovery from an
external power loss during remote control operation. However, do not use the MC frequently for start/stop operation, or it will lead to a reduced
reliability. When the digital operator is used, automatic restart after power failure is disabled, so that MC starting is impossible. Although the MC can
stop the inverter, regeneration braking is disabled and the motor coasts to a stop.
Use of secondary magnetic contactor
In general magnetic contactors on the output of the inverter, for motor control should not be used. Starting a motor with the inverter running will cause
large surge currents and the inverter overcurrent protector to trigger. If an MC is used for switching to commercial power supply, switch MC after the
inverter and the motor stop. To switch during motor rotation, use the speed search command. (See page 21.)
Use of overload relay
The inverter includes an electronic thermal protective function to protect the motor from overheating. However, when multi-drive by one inverter is used,
place a overload relay between the inverter and the motor. Set 2 in n33, and set the ovverload relay to the current nameplate value at 50Hz, or 1.1 times of
that at 60Hz.
Power-factor improvement
(elimination of phase advance capacitor)
To improve the power-factor, install a DC reactor or an AC reactor on the inverter's power side. Power-factor improvement capacitor or surge suppressors
on the inverter output side will be damaged by the harmonic component in the inverter output. Also, the overcurrent caused in the inverter output will
trigger the overcurrent protection. To avoid this, do not use capacitors or surge suppressors in the inverter's output. To improve the power-factor, install
an AC reactor on the inverter primary side.
Radio frequency interference
Because the inverter I/O (main circuit) contains a higher harmonics component, it may emit RFI noise to communication equipment (AM radio, etc.) near
the inverter. Use a noise filter to decrease the noise. Use of a metalic conduit between the inverter and motor and grouding the conduit is also effective.
Proper routing of input and output lead is also recommended.
Wire thickness and cable length
If a long cable is used between the inverter and a motor (especially when
low frequency is output ), motor torque decreases because of voltage drop in
the cable. Use sufficiently thick wire. If a long cable is used and inverter
carrier frequency (main transistor switching frequency) is high, harmonic
leakage current from the cable will increase to affect the inverter unit or
peripheral devices. Reduce the inverter carrier frequency.
When a digital operator is to be installed separately from the inverter, use
the YASKAWA remote interface and special connection cable (option). For
remote control with analog signals, connect the operating signal terminal
and the inverter within 30m (98.4ft) of the inverter. The cable must be
routed separately from power circuits (main circuit and relay sequence
circuit) so that it is not subjected to inductive interference by other
equipment. if frequencies are set not only from the digital operator but also
with external frequency controller, use twisted-pair shielded wire as shown
in the following figure and connect the shielding to terminal .
FREQUENCY
CONTROLLER
SHIELDED
INSULATED
WIRE
CONNECTION
TERMINAL
FS SPEED SETTING
POWER +12V 20mA
FR MASTER
REFERENCE
0 TO +10V (20KΩ)/
4 TO 20mA
TWISTED-PAIR
SHIELDED WIRE
0 to +10V
FC
0V
3
PP
2kΩ
2
1
NOTES ON USE (Cont'd)
- VS mini J7 1
- Inverter Magic 2
- Performance 3
- Functions 3
- Operability 3
- Compact Size 4
- OPERATING DIGITAL OPERATOR 5
- Changing the displayed data 6
- Selecting the constant no 6
- Fault display method 6
- STANDARD SPECIFICATIONS 7
- CIMR— J7AA20P1 8
- STANDARD WIRING 9
- CONSTANTS LIST 10
- (Cont'd) 11
- Multi-function input 12
- CONSTANTS LIST (Cont'd) 13
- PROGRAMMING FEATURES 15
- Setting Operating Condition 17
- Operating at low speed 18
- Using two accel/decel times 18
- Soft-start characteristics 19
- Torque detection 19
- Frequency detection 20
- Avoiding resonance 20
- Selecting Method to Stop 22
- PROGRAMMING FEATURES (Cont’d) 23
- Adjusting Motor Torque 24
- Stall prevention during decel 25
- Motor Protection 26
- PROTECTIVE FUNCTIONS 27
- Faults and Corrective Actions 28
- PROTECTIVE FUNCTIONS (Cont’d) 29
- Inverter 30
- Peripheral Devices 31
- Noise Countermeasures 32
- NOTES ON USE (Cont'd) 33
- OPTIONS AND PERIPHERAL UNITS 34
- Surge Suppressor 35
- Isolator 36
- Zero Phase Reactor 39
- Input Noise Filter 40
- Singapore, Indonesia 43
- Thailand, Malaysia 43
- Philippines, Hong Kong 43
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