Emerson Liebert ICOM-DO Installation Manual download pdf (Page 49)

Electrical Connections

9.1.1 Power Supply Cable Connections

• Connect the cable to the line inlet terminal board.

• Use the appropriate cable size for the flow, supply voltage and installation type.

• Protect the supply using a backup fuse.

• Do not fit the supply cable in the raceways inside the machine electric board.

• Use only multipolar cables with sheath (CEI20-22).

Wiring Connections

• Remote On/Off connections must be provided by the installer.

• The General Alarm terminals allow remote alarm signalling.

In case of short circuit, check the affected switch for sticking and replace it if necessary.

See electrical data in Appendix B - Electrical Data.

9.2 Protective Features of the Electrically Commutated Fans

The EC fans are protected against:

• Overtemperature of electronics

• Overtemperature of motor

• Locked rotor protection

• Short circuit at the motor output

When any of these failures occurs, the motor stops, electronically, with no potential for separation,

and the status relay is released.

The unit does not restart automatic automatically. To reset the alarm, the power supply must be

switched Off for 20 minutes once motor is at standstill.

• Input power undervoltage detection:

If the utility power falls below 3ph/290VAC (typical value) for 5 seconds or longer, the motor is

switched Off, electronically, with no potential for separation, and the status relay is released.

When the utility voltage returns to a correct value, the motor restarts automatically.

• Phase failure recognition:

If one phase fails for 5 seconds or longer, the motor is switched Off, electronically, with no poten-

tial for separation, and the status relay is released.

When all three phases return to correct values, the motor restarts automatically in 10 to 40 sec-

onds.

The power supply for an external speed-setting potentiometer is protected against short-circuiting.

The motor is overload-protected via motor current limitation.

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Emerson Liebert ICOM-DO Installation Manual Page 49