Fuji Electric FRENIC-MEGA, Instruction Manual

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2-14
DC link bus terminals P(+) and N(-)
Capacity
(HP)
Braking
transistor
Built-in DC braking
resistor (DBR)
Optional devices Devices and terminals
50 to 1000 None None
Braking unit Inverter ― Braking unit: P(+) and N(-)
DC braking resistor (DBR) Braking unit ― DBR: P(+) and DB
1) Connecting an optional braking unit or DC braking resistor (DBR)
Inverters of 50 HP or above require both a braking unit and DBR.
Connect the terminals P(+) and N(-) of a braking unit to those on the inverter. Arrange the inverter and the braking unit so
that the wiring length comes to 16 ft (5 m) or less and twist the two wires or route them together in parallel.
Next, connect the terminals P(+) and DB of a DBR to those on the braking unit. Arrange the braking unit and DBR so that the
wiring length comes to 33 ft (10 m) or less and twist the two wires or route them together in parallel.
For details about the wiring, refer to the Braking Unit Instruction Manual.
2) Connecting other external devices
A DC link bus of other inverter(s) or a PWM converter is connectable to these terminals.
When you need to use the DC link bus terminals P(+) and N(-), consult your Fuji Electric representative.
Switching connectors
„
Power switching connectors (CN UX) (on inverters of 125 HP or above for 460 V)
Inverters of 125 HP or above for 460 V are equipped with a set of switching connectors (male) which should be configured
according to the power source voltage and frequency. By factory default, a jumper (female connector) is set to U1. If the power
supply to the main power inputs (L1/R, L2/S, L3/T) or the auxiliary fan power input terminals (R1, T1) matches the conditions
listed below, change the jumper to U2.
For the switching instructions, see Figures 2.6 and 2.7.
(a) FRN125G1S-4U to FRN200G1S-4U
Connector configuration
Power source voltage
398 to 440 V/50 Hz, 430 to 480 V/60 Hz
(Factory default)
380 to 398 V/50 Hz
380 to 430 V/60 Hz
(b) FRN250G1S-4U to FRN1000G1S-4U
Connector configuration
Power source voltage
398 to 440 V/50 Hz, 430 to 480 V/60 Hz
(Factory default)
380 to 398 V/50 Hz,
380 to 430 V/60 Hz
The allowable power input voltage fluctuation is within -15% to +10% of the power source voltage.
CN UX (red)
CN UX (red)
CN UX (red)
CN UX (red)