Delta Electronics VFD-G manual Vfdb

Chapter 2 Installation and Wiring

„To improve the power factor and reduce harmonics, connect a DC reactor between terminals [+1, +2(+2/B1)]. Please remove the jumper before connecting the DC reactor.

„Models of 18.5kW~160kW have a built-in DC reactor; models of 185kW~220kW have a built-in AC reactor.

Terminals [+2/B1, B2] for connecting brake resistor and terminals [+2(+2/B1), -] for connecting

external brake unit

Bra ke Resistor (Opt io nal)

Ref er to Appen dix B for details.

B R

	Bra ke Resistor/Unit (Opt ional)
B R	Ref er to App endix B f or deta ils.

VFDB

+2/B1	B2	+2	-
Fo r 460V series, 20H P and below		Fo r 460V series, 25HP an d abo ve

„Connect a brake resistor or brake unit in applications with frequent deceleration ramps, short deceleration time, too low brake torque or requiring increased brake torque.

„If the AC motor drive has a built-in brake chopper (all models of 15kW and below), connect the external brake resistor to the terminals [＋2/B1, B2].

„Models of 18.5kW and above don’t have a built-in brake chopper. Please connect an external optional brake unit (VFDB-series) and brake resistor. Refer to VFDB series user manual for details.

„When not used, please leave the terminals [+2(+2/B1), -] open.

„Short-circuiting [B2] or [-] to [+2/B1] can damage the AC motor drive.

„Connect the terminals [+(P), -(N)] of the brake unit to the AC motor drive terminals [+2(+2/B1), -]. The length of wiring should be less than 5m with twisted cable.

2-10 Revision July 2008, EG03, SW V1.06