Input Wiring - ABB ACH 400 User Manual

Input Wiring

Connection Points
ACH 400 with Electronic Bypass User's Manual
The ACH 400 with Electronic Bypass is designed for use on a three-phase
system. Four wires (three phase wires plus a ground wire) are required for the
input wiring.
All field power wiring shall be copper, rated for 60°C if rated for less than 100
amps or 75°C if rated 100 amps or more.
When connected to a 480 VAC power source, the ACH 400 with Electronic
Bypass with the circuit breaker option is suitable for use on a circuit capable
of delivering not more than 20,000 RMS symmetrical amperes (14,000 RMS
symmetrical amperes for the 3 and 5 Hp models). When connected to a
240 VAC power source, the ACH 400 with Electronic Bypass with the circuit
breaker option is suitable for use on a circuit capable of delivering not more
than 50,000 RMS symmetrical amperes.
WARNING!
• Do not connect or disconnect input or output power wiring, or control
wires, when power is applied.
• Never connect line voltage to drive output Terminals T1, T2, and T3.
• Do not make any voltage tolerance tests (Hi Pot or Megger) on any
part of the unit. Disconnect motor wires before taking any
measurements in the motor or motor wires.
• Make sure that power factor correction capacitors are not connected
between the drive and the motor.
For Frames R1 through R4
Connect the input power to the terminals at the bottom of the disconnect
switch or circuit breaker as shown in Figure 3-1. Connect the equipment
grounding conductor to the ground lug near the input power connection point.
Caution: For frames R1 and R2, note that two of the input power wires must
be passed through the windows of two current transformers located just below
the terminals of the disconnect switch or circuit breaker. If these wires do not
pass through the current transformers, the bypass will not provide motor
overload protection.
For Frames R5 through R9
Connect input power to the terminals of the disconnect switch or circuit
breaker. Connect the equipment grounding conductor to the ground lug at the
bottom of the enclosure. Figure 3-2 shows the connection points for frames
R5 through R6. For frames R7 through R9, refer to the appropriate detailed
drawings at the beginning of this chapter for conduit entry locations.
Chapter 3 – Installation Instructions
3-15