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G. PERIPHERAL UNIT NOTES
• Installation and selection of molded-case circuit breaker
On the input power side, a molded case circuit breaker (MCCB) to protect the AC Drive’s primary wiring should
be installed. The drive’s power factor (depending on power voltage, output frequency, and load) must
be taken into account for selecting the MCCB. For standard selection, see part page 4 I -5. 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 of AC Drive use is recommended.
• Use of input side magnetic contactor
The AC Drive 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 AC Drive, regeneration braking is disabled and the motor coasts to stop.
• Use of secondary magnetic contactor
In general, magnetic contactors on the output of the AC Drive for motor control should not be used. Starting
a motor with the AC Drive at set frequency running will cause large surge currents and the AC Drive over-
current protection to be triggered. If an MC is used for switching to commercial power supply, switch MC only
after the AC Drive and the motor stop. To switch during motor rotation, use the speed search function.
• Use of overload relay
The AC Drive includes an electronic thermal protective function to protect the motor from overheating. If
more than one motor is driven with a single AC Drive or when a multi-pole motor is used, place an overload
relay between the AC Drive and the motor. Set 1 to the first position of Sn-14 (xxx1), and set the overload relay
to the current nameplate value at 50Hz, or 1.1 times of that at 60 Hz.
• Power-factor improvement (elimination of phase advance capacitor)
To improve the power-factor, install an AC reactor on the AC Drive’s primary side. Power-factor improvement
capacitors or surge suppressors on the AC Drive’s output side will be damaged by the harmonic component in
the AC Drive’s output. Also, the over current caused in the AC Drive output will trigger the over current
protection. To avoid this, do not use capacitors or surge suppressors in the AC Drive’s output. To improve the
power-factor, install an AC reactor on the AC Drive’s primary
side.
• Radio frequency interference
Because the AC Drive’s I/O (main circuit) contains a higher harmonics component, it may emit RFI noise to
communication equipment (AM radio, etc.) near the AC Drive. Use a noise filter to decrease the noise. Use of
a metallic conduit between the AC Drive and motor and grounding the conduit is also effective. Proper
routing of input and output leads is also recommended.
• Wire thickness and cable length
If the AC Drive is connected to a distant motor, (especially when low frequency is asserted,) motor torque
decreases because of the voltage drop in the cable. Use sufficiently heavy wire. When a digital operator is to be
installed separately from the AC Drive, use the TECO connection cable (option). For remote control with analog
signals, connect the operating pot or operating signal terminal and the AC Drive within 30m of the AC Drive.
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 E, not to the ground.
App-14
PA 7300
APPENDIX
AUX. FREQ. REFERENCE 0
- 10V (20 k) INPUT
E
+15V
VIN
AI
AUX
GND
0V.
P
P
P
0V
0 TO +10V
4 TO 20mA
0 TO +10V
FREQUENCY
CONTROLLER
2k
SHIELDED INSULATED WIRE
CONNECTION TERMINAL
MASTER SPEED REFERENCE
0 - 10V (20 k)
MASTER SPEED REFERENCE
4 - 20mA (250Ω)
3
2
1
TWISTED PAIR
INSULATED WIRE
ANALOG POWER SUPPLY
+15V 200mA
Содержание PA7300 Series
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