Electrical Installation | 7
Operating instructions CMVpro 125-400 | Version 1-en
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7.3
Instructions for frequency converter (FC) use
DANGER
Risk of injury due to impeller explosion
Serious injuries due to debris being launched out.
▪ Exceeding the maximum speed after a malfunction or faulty operating con-
dition of the frequency converter.
u
Splinter protection shall be mounted on the fan
_
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The manufacturer recommends using a frequency converter with an inte-
grated SLS safety function.
u
Alternatively, implement higher-level drive control with an SLS safety sub-
function.
The SLS (Safely Limited Speed) safety function prevents the electric motor from
exceeding a specified speed limit.
WARNING
Risk of injury due to high contact voltage
Injury by electric shock.
▪ If long cable shields are not connected/grounded, high contact voltages can
occur during operation.
u
Connect cable shields of motor connection cables and signal lines to a com-
mon reference potential.
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Do not use protective earth connections for shielding purposes.
WARNING
Risk of injury due to dangerous residual voltage
Injury by electric shock.
▪ After the fan has been switched off, dangerous residual voltage is still
present in the frequency converter.
u
The operating instructions of the frequency converter provide information
about the time to be observed until this residual voltage has dropped to a
safe value.
u
Before beginning work on the electrical components, always establish an
electrically safe work condition of the frequency converter.
7.3.1
Frequency converter (FC) installation options
For CMVpro 125-400 type centrifugal fans, different executions of electric mo-
tors (IM, EC, PM) can be selected as a drive:
• IM ... Standard asynchronous motor/three-phase motor
• EC ... Brushless DC motor (highest energy efficiency)
• PM ... Permanent magnet motor