If you’re looking to wire up an ABB ACH550 Bypass, you’ve come to the right place. This journal article will give you a detailed breakdown of the wiring process, including diagrams and FAQs, to help you get your bypass up and running in no time.
Overview of ABB ACH550 Bypass
The ABB ACH550 is a variable frequency drive (VFD) that is designed to control the speed of AC motors. However, in some applications, it may be necessary to bypass the VFD and run the motor at full speed. For example, if the VFD fails, you may need to bypass it to keep the motor running.
The ABB ACH550 Bypass provides a way to bypass the VFD and directly connect the motor to the power source. It consists of a bypass contactor, a control transformer, and an overload relay.
Wiring Diagram
Below is a detailed wiring diagram for the ABB ACH550 Bypass:
| Wire Number | Wire Color | Description |
|---|---|---|
| 1 | Black | L1 In |
| 2 | Red | L2 In |
| 3 | Blue | L3 In |
| 4 | Brown | Ground |
| 5 | Orange | NC Auxiliary of Contactor |
| 6 | Yellow | NO Auxiliary of Contactor |
| 7 | Green | Control Transformer Ground |
| 8 | Purple | Control Transformer 120V |
| 9 | Grey | Overload Relay NC |
| 10 | Pink | Overload Relay NO |
| 11 | White | Control Transformer Neutral |
| 12 | Black/Red | Bypass Contactor Control |
| 13 | White/Yellow | L1 Out |
| 14 | White/Red | L2 Out |
| 15 | White/Blue | L3 Out |
Step-By-Step Wiring Guide
Here’s a step-by-step guide to wiring your ABB ACH550 Bypass:
Step 1: Mount the Bypass Contactor and Control Transformer
The bypass contactor and control transformer should be mounted in their respective locations, according to the manufacturer’s instructions. Make sure to follow all installation instructions carefully.
Step 2: Connect the Power Wires
Connect the black, red, and blue power wires to the L1, L2, and L3 terminals on the ACH550 drive. Connect the ground wire to the ground terminal.
Step 3: Connect the Control Transformer
Connect the control transformer ground wire to the ground terminal on the ACH550 drive. Connect the 120V wire to the neutral terminal on the ACH550 drive. Connect the control transformer neutral wire to the neutral terminal on the bypass contactor.
Step 4: Connect the Overload Relay
Connect the overload relay NC wire to the NC terminal on the bypass contactor. Connect the overload relay NO wire to the NO terminal on the bypass contactor.
Step 5: Connect the Bypass Contactor
Connect the black/red bypass contactor control wire to the ACH550 drive. Connect the white/yellow, white/red, and white/blue wires from the bypass contactor to the L1, L2, and L3 terminals on the motor, respectively.
FAQs
Q: What is a bypass contactor?
A: A bypass contactor is an electrical switch that allows an electrical current to pass through it when it is closed. In the case of the ABB ACH550 Bypass, the bypass contactor is used to bypass the VFD and directly connect the motor to the power source.
Q: What is an overload relay?
A: An overload relay is a device that is designed to protect the motor from overloading. If the motor draws too much current, the overload relay will trip and disconnect the motor from the power source.
Q: What is a control transformer?
A: A control transformer is a transformer that is used to step down the voltage of the control circuit. In the case of the ABB ACH550 Bypass, the control transformer is used to step down the voltage of the control circuit from 120V to a lower voltage that can be used to control the bypass contactor and overload relay.
Q: Can I use the ABB ACH550 Bypass with any motor?
A: The ABB ACH550 Bypass is designed to work with AC motors that have a voltage rating of 208–480V and a frequency rating of 50/60 Hz. Make sure to check the specifications of your motor before using the bypass.
Q: Do I need any special tools to wire the ABB ACH550 Bypass?
A: You will need basic electrical tools, such as wire cutters, wire strippers, and screwdrivers, to wire the ABB ACH550 Bypass. Make sure to follow all safety precautions when working with electricity.
Q: Can I test the ABB ACH550 Bypass before installing it?
A: Yes, you can test the ABB ACH550 Bypass before installing it. Connect the bypass according to the wiring diagram, then connect a motor to the L1, L2, and L3 terminals on the bypass contactor. Turn on the power and test the motor to make sure it runs properly.
Conclusion
Wiring up an ABB ACH550 Bypass may seem like a daunting task, but with this detailed guide, you should be able to do it with ease. Make sure to follow all safety precautions and consult the manufacturer’s instructions if you have any questions. Once your bypass is up and running, you’ll have a reliable way to keep your motor running even if the VFD fails.
