Specifications

Chapter 3: Wiring
Firmware – S2011 and S3012
Revision: 1 (9/98) 11 © Saftronics, Inc.
2. Voltage or current input for the master frequency reference can be selected by constant n042. Voltage reference input is
preset at the factory (FV).
3. Control circuit Terminal FS of + 15V has a maximum output current capacity of 20 mA.
4. Multi-function analog output should be used for monitoring meters (e.g., output frequency meter) and should not be used
for feedback control system.
3.2 Wiring the Main Circuit
WARNING
•
Make sure to ground the ground terminal ( ). (Ground resistance 200V class: 100Ω or less, 400V class: 10× or less.)
Failure to observe this can result in an electrical shock or a fire.
CAUTION
•
Never connect the AC main circuit power supply to output Terminals T1, T2, and T3 (U, V and W). The Inverter will be
damaged and invalidate the warranty.
3.2.1 Wiring Precautions for Main Circuit Input
§ Installation of Molded Case Circuit Breaker (MCCB)
Make sure to connect Molded Case Circuit Breakers (MCCB) or fuses between AC main circuit power supply and
FP5/GP5 input Terminals L1, L2 and L3 (R, S, and T) to protect wiring.
§ Installation of Ground Fault Interrupter
When connecting a ground fault interrupter to input Terminals L1, L2 and L3 (R, S, and T), select one that is not
affected by high frequency.
Examples: NV series by Mitsubishi Electric Co., Ltd. (manufactured in or after 1988), EG, SG series by Fuji Electric
Co., Ltd. (manufactured in or after 1984).
§ Installation of Magnetic Contactor
Inverters can be used without a Magnetic Contactor (MC) installed at the power supply side. When the main circuit
power supply is shut OFF in the sequence, a MC can be used instead of a MCCB. However, when a MC is switched
OFF at the primary side, regenerative braking does not function and the motor coasts to a stop.
• The load can be operated/stopped by opening/closing the MC at the primary side. However, frequent switching
may cause the Inverter to malfunction.
• When using a Braking Resistor Unit, use a sequencer to break power supply side on overload relay trip contact.
If the Inverter malfunctions, the Braking Resistor Unit may be damaged.
§ Terminal Block Connection Sequence
Input power supply phases can be connected to any terminal regardless of the order of L1, L2 and L3 (R, S, and T)
on the terminal block.
§ Installation of AC Reactor
When connecting an Inverter (200V/400V 15kW or less) to a large capacity power supply transformer (600k VA or
more), or when switching a phase advancing capacitor, excessive peak current flows in the input power supply
circuit, which may damage the converter section. In such cases, install a DC Reactor (optional) between Inverter ¾
1 and ¾ 2 terminals or an AC Reactor (optional) on the input side. Installation of a reactor is effective for
improvement of power factor on the power supply side.
indicates twisted-pair shielded wires.indicates shielded wires and
NOTE:
1.
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