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Safety Precautions
Installation Inspection
ACH 400 with Electronic Bypass User's Manual
Chapter 4 – Start-up Procedure
This chapter explains how to inspect the installation and how to start up the
ACH 400 with Electronic Bypass.
Before start-up, read and follow the precautions listed below.
• After the supply voltage is disconnected from the input, the DC Bus
capacitors should discharge to a safe voltage in about five minutes.
• To ensure that the voltage level is safe, measure the voltage between the
DC Bus terminals, U
testing meter must be rated for 1000 VDC.
WARNING! When the ACH 400 with Electronic Bypass is connected to the
line power, the Motor Terminals T1, T2, and T3 are live even if the motor is
not running. Do not make any connections when the ACH 400 with
Electronic Bypass is connected to the line. Disconnect and lock out power to
the drive before servicing the drive. Failure to disconnect power may cause
death or serious injury.
Inspect the mechanical and electrical installation of the ACH 400 with
Electronic Bypass for compliance with your local electrical installation
regulations and codes.
Note: Do not connect the motor wires before proceeding with the Keypad
Control Test with Motor Disconnected. Refer to Keypad Control Tests
in this chapter.
After installation, inspect the following:
• ACH 400 with Electronic Bypass and motor grounding.
• Supply and motor wire size and connections.
• Control cable connections, wire shield grounding, and control cable
location away from the power wires.
• Quantity and quality of cooling air for the ACH 400 with Electronic
Bypass.
Connect the ACH 400 with Electronic Bypass to supply voltage. Check that
the voltage between L
– L
1
Refer to Chapter 3 – Installation Instructions in this manual for detailed
installation instructions and requirements.
+ and U
- inside the ACH 400 drive unit. The
C
C
, L
– L
, and L
– L
2
1
3
2
is V
+ 10%.
3
N
4-1
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