systemair 31
On gure below:
Starconnection upto3kW(left),
Deltaconnection 3to7,5kW(middle),
Delta-starconnection above7,5kW(right).
Connection of the frequency converter power supply
• Step 1: First, connect the grounding cable
• Step 2: Connect electric supply cables to L1/L, L2 and L3/N.
On gure below:
• Connection of grounding cable (left),
• Connection of ground cable, line power and motor wires (middle),
• Three-phase and single-phase connection (right).
For the three-phase connection, connect the wires to all three terminals.
For the single-phase connection, connect the wires to terminals L1/L and L3/N.
For proper installation according to EMC, use an optional split panel.
Motor cables
• Useascreened/armouredmotorcabletocomplywithEMCemissionspecications(orinstallthecableinmetal
conduit).
• Keepthemotorcableasshortaspossibletoreducethenoiselevelandleakagecurrents.
• Connect the motor cable screen/armour to both the decoupling plate of the frequency converter and to the metal of
the motor. (Same applies to both ends of metal conduit if used instead of screen.)
• Makethescreenconnectionswiththelargestpossiblesurfacearea(cableclamporbyusinganEMCcablegland).
This is done by using the supplied installation devices in the frequency converter.
• Avoid terminating the screen by twisting the ends (pigtails), as this will spoil high frequency screening effects.
• Ifitisnecessarytobreakthecontinuityofthescreentoinstallamotorisolatorormotorrelay,thecontinuitymustbe
maintained with the lowest possible HF impedance.
Cable shielding
Do not install cables with twisted ends. Such cables destroy the shielding effect at higher frequencies. If it is necessary
to split the shield due to the installation of a motor insulator or motor relay, the shield must continue with the lowest
possible high frequency impedance.
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