ABB ACH550-BCR Installation, operation & maintenance manual - Safety

2

ACH550 Installation, Operation and Maintenance Manual

Safety

Safety

Use of warnings and notes

There are two types of safety instructions throughout this manual:

• Notes draw attention to a particular condition or fact, or give information on a 

subject. 

• Warnings caution you about conditions which can result in serious injury or death 

and/or damage to the equipment. They also tell you how to avoid the danger. The 

warning symbols are used as follows:

Electricity warning warns of hazards 

from electricity which can cause 

physical injury and/or damage to the 

equipment.

• WARNING! The ACH550 adjustable speed 

AC drive should ONLY be installed by a 

qualified electrician.

• WARNING! Even when the motor is 

stopped, dangerous voltage is present at the 

power circuit terminals U1, V1, W1 (L1, L2, 

L3) and U2, V2, W2 (T1, T2 T3) and, 

depending on the frame size, UDC+ and 

UDC-, or BRK+ and BRK-.

• WARNING! Dangerous voltage is present 

when input power is connected. After 

disconnecting the supply, wait at least 5 

minutes (to let the intermediate circuit 

capacitors discharge) before removing the 

cover.

• WARNING! Even when power is switched 

off from the input terminals of the ACH550, 

there may be dangerous voltage (from 

external sources) on the terminals of the 

relay outputs.

• WARNING! When the control terminals of 

two or more drives are connected in parallel, 

the auxiliary voltage for these control 

connections must be taken from a single 

source which can either be one of the drives 

or an external supply. 

• WARNING! Disconnect the internal EMC 

filter when installing the drive on an IT 

system (an ungrounded power system or a 

high-resistance-grounded [over 30 ohm] 

power system).

• WARNING! Do not attempt to install or 

remove EM1, EM3, F1 or F2 screws while 

power is applied to the drive’s input 

terminals.

General warning warns about 

conditions, other than those caused 

by electricity, which can result in 

physical injury and/or damage to the 

equipment.

• WARNING! Do not control the motor with 

the disconnecting device (disconnecting 

means); instead, use the control panel keys 

or commands via the I/O board of the drive. 

The maximum allowed number of charging 

cycles of the DC capacitors (i.e. power-ups 

by applying power) is five in ten minutes.

• WARNING! Never attempt to repair a 

malfunctioning ACH550; contact the factory 

or your local Authorized Service Center for 

repair or replacement.

• WARNING! The ACH550 will start up 

automatically after an input voltage 

interruption if the external run command is 

on.

• WARNING! The heat sink may reach a high 

temperature.

Note: For more technical information, contact 

the factory or your local ABB representative.