VAF instruments PEM2, Техническое руководство

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Figure 5 – Power supply and RS485 Modbus cable connection to PEM2 touch screen
4. Ensure that the Modbus cable is properly shielded and grounded as close as possible to the stator
control box. The Modbus cable shield cannot be connected to the touch screen.
5. Check for correct DC supply power and integrity of external wiring connections. Turn on power and
observe several readings, like torque, shaft speed, power etc. If not, check wiring and verify whether
the inputs are in agreement with actual value.
Important notes

Never connect cable shields at both ends to ground, but at one end only, to avoid
earth loops.

To avoid interference on the signal cables, such cables must be installed as far as
possible from electric power cables used for power supply and stator.

Ensure that the ambient temperature at the PEM2 never exceeds 55°C (131°F).