Operation Of The Motor; Checks Before Starting The Motor; Measuring The Cable And Motor Insulation; Installation In A Corner-Grounded Network - Vacon 100 Flow Installation Manual

COMMISSIONING AND ADDITIONAL INSTRUCTIONS
8.2

OPERATION OF THE MOTOR

8.2.1

CHECKS BEFORE STARTING THE MOTOR

Before you start the motor, do these checks.
Make sure that all the START and STOP switches that are connected to the control
•
terminals are in the STOP position.
Make sure that you can start the motor safely.
•
Activate the Start-up wizard. See the Application Manual for the AC drive that you have.
•
Set the maximum frequency reference (that is, the maximum speed of the motor), so that
•
it agrees with the motor and the device that is connected to the motor.
8.3

MEASURING THE CABLE AND MOTOR INSULATION

Do these checks if necessary.
The insulation checks of the motor cable
1. Disconnect the motor cable from the terminals U, V, and W and from the motor.
2. Measure the insulation resistance of the motor cable between phase conductors 1 and 2,
between phase conductors 1 and 3, and between phase conductors 2 and 3.
3. Measure the insulation resistance between each phase conductor and the grounding
conductor.
4. The insulation resistance must be >1 MΩ at the ambient temperature of 20 °C (68 °F).
The insulation checks of the mains cable
1. Disconnect the mains cable from the terminals L1, L2, and L3 and from mains.
2. Measure the insulation resistance of the mains cable between phase conductors 1 and 2,
between phase conductors 1 and 3, and between phase conductors 2 and 3.
3. Measure the insulation resistance between each phase conductor and the grounding
conductor.
4. The insulation resistance must be >1 MΩ at the ambient temperature of 20 °C (68 °F).
The insulation checks of the motor
1. Disconnect the motor cable from the motor.
2. Open the bridging connections in the motor connection box.
3. Measure the insulation resistance of each motor winding. The voltage must be the same
or higher than the motor nominal voltage, but not higher than 1000 V.
4. The insulation resistance must be >1 MΩ at the ambient temperature of 20 °C (68 °F).
5. Obey the instructions of the motor manufacturer.
8.4

INSTALLATION IN A CORNER-GROUNDED NETWORK

You can use corner grounding with the drive sizes MR8-MR12 with a 208-240 V mains and
with a 380-480 V mains. In these conditions, you must change the EMC protection level to C4.
See the instructions in chapter 8.5 Installation in an IT system.
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