Surge Suppression Unit (Ssu) - Fuji Electric FRENIC-HVAC User Manual

4.4.1.4

Surge suppression unit (SSU)

If the drive wire for the motor is long, an extremely low surge voltage (micro surge) occurs
at the wire end connected to the motor. Surge voltage causes motor degradation, insulation
breakdown, or increased noises. The surge suppression unit (SSU) suppresses the surge
voltage. It features the connectivity for all motor capacities and easy wiring work. Surge
suppression unit cannot be used with the 575V class series.
 Dimensions
• 50 m(164 ft) spec.:
SSU 50TA-NS
 Effects of installing the surge suppression units (shown by voltage waveform between motors)
Motor/inverter capacity: 3.7kW(5 HP)
Wiring length: 50 m (164 ft)
Running status: No-load
Power supply voltage: Three-phase 400 V
Motor/inverter capacity: 75kW(100 HP)
Wiring length: 100 m (328 ft)
Running status: No-load
Power supply voltage: Three-phase 400 V
 Basic specifications
Item
Type
Applicable wiring length
Power supply voltage
Inverter capacity
Output frequency
Carrier frequency
Enclosure
Installation environment
Dielectric strength voltage
• 100 m (328 ft) spec.:
Specifications
SSU 50TA-NS
50 m (164 ft) or shorter
200 V and 400 V classes, PWM converter is applicable
75kW(100 HP) or below
400 Hz or below
15 kHz or below (The SSU is not available at 16 kHz.)
IP20/ Open type
Ambient temperature: -20 to +40°C (-4 to 104°F), Relative humidity: 85%
RH or below, Vibration: 0.7 G or less, Installation: Horizontally
2500 VAC, 1 minute
4-43
4.4 Options
SSU 100TA-NS
SSU 100TA-NS
100 m (328 ft) or longer