BENSHAW RSi GM2 Series - Page 28

Installing the Inverter
18
GM2 Series VFD
890054-00-00
Power Terminal Labels and Descriptions
Terminal Labels
Name
Description
Ground Terminal
Connect earth grounding.
R(L1)/S(L2)/T(L3)
AC power input
terminal
Mains supply AC power connections.
B1/B2
Brake resistor
terminals
Brake resistor wiring connection.
U/V/W
Motor output
terminals
3-phase induction motor wiring
connections.
Note
• When operating Brake resistor, the motor may vibrate under the Flux braking operation. In this case,
please turn off the Flux braking (Pr.50).
• Motor Cable Length:
1.0 HP (0.75kW) -> 5.0 HP (4.0kW) -----------maximum 165 ft (50m)
7.5 HP (5.5 kW) -> 15 HP (11kW) -------------maximum 665 ft (202m)
• Long cable runs can cause reduced motor torque in low frequency applications due to voltage drop.
Long cable runs also increase a circuit’s susceptibility to stray capacitance and may trigger over-current
protection devices or result in malfunction of equipment connected to the inverter. Voltage drop is
calculated by using the following formula:
Voltage Drop (V) = [

 X cable resistance (mΩ/m) X cable length (m) X current (A)] / 1000
• Use cables with the largest possible cross-sectional area to ensure that voltage drop is minimized over
long cable runs. Lowering the carrier frequency and installing a micro surge filter may also help to
reduce voltage drop.
Distance
< 165 ft (50 m)
< 330 ft (100 m)
> 330 ft (100 m)
Allowed Carrier Frequency
< 15 kHz
< 5 kHz
< 2.5 kHz
Do not apply power to the inverter until installation has been fully completed and the inverter is ready to
be operated. Otherwise it may cause an electrical shock and result in personal injury or even death.