3. Apply conductive lubrication
4. Try to ensure the line voltage is balanced to ground. This can be difficult for IT, TT, TN-CS or Grounded leg systems
5. Use an insulated bearing as recommended by the motor manufacturer (note: Motors from reputable manufacturers will typically have these
fitted as standard in motors of this size)
If found to be necessary and after consultation with Danfoss:
6. Lower the IGBT switching frequency
7.
Modify the inverter waveform, 60° AVM vs. SFAVM
8. Install a shaft grounding system or use an isolating coupling between motor and load
9. Use minimum speed settings if possible
10. Use a dU/dt or sinus filter
4.6.20 Control Cable Routing
Tie down all control wires to the designated control cable routing as shown in the picture. Remember to connect the shields in a proper way to ensure
optimum electrical immunity.
Fieldbus connection
Connections are made to the relevant options on the control card. For details see the relevant fieldbus instruction. The cable must be placed in the
provided path inside the frequency converter and tied down together with other control wires (see pictures).
Control card wiring path for the D11 Control card wiring path for the E7
4.6.21 Access to Control Terminals
All terminals to the control cables are located beneath the LCP (both filter and drive LCP). They are accessed by opening the door of the unit.
4.6.22 Electrical Installation, Control Terminals
To connect the cable to the terminal:
1. Strip insulation by about 9-10 mm
2.
Insert a screwdriver
1)
in the square hole.
3. Insert the cable in the adjacent circular hole.
4 How to Install
VLT HVAC Low Harmonic Drive Operating In-
structions
58 MG.16.A1.02 - VLT
®
is a registered Danfoss trademark
4
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