Xylem Aquavar, Instruction Manual

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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 Xylem:
1. Lower the IGBT switching frequency
2. Modify the inverter waveform, 60° AVM vs. SFAVM
3. Install a shaft grounding system or use an isolating coupling between motor and load
4. Use minimum speed settings, if possible.
5. Use a dU/dt or sinus filter
5.15 Control terminals
5.15.1 Control cable routing
Tie down all control wires to the designed control cable routing as shown in the picture.
Remember to connect the shields in a proper way to ensure optimum electrical immunity.
Serial communication bus connection
Connections are made to the relevant options on the control card. For details, see the
relevant serial communication bus instruction. The cable must be placed in the provided
path inside the adjustable frequency drive and tied down with other control wires.
Figure 65: Control card wiring path for the D3. Control card wiring for D1, D2, D4, E1 and E2 use
the same path
Installation of 24 Volt external DC supply
Torque: 0.5–0.6 Nm (5 in-lbs)
Screw size: M3
Number Function
35 (-), 36 (+) 24 V external DC supply
24 V DC external supply can be used as low-voltage supply to the control card and any
option cards installed. This enables full operation of the LCP (including parameter setting)
5 Electrical Installation
56 Aquavar ® Intelligent Pump Controller - 150 HP to 600 HP INSTRUCTION MANUAL