Technical data

Rexroth IndraDyn H Startup, Operation and Maintenance 12-13

DOK-MOTOR*-MBS-H******-PR02-EN-P

12.8 Maintenance and Inspection of Motor components

IndraDyn H motor components do not require maintenance. However,

due to external influences, the motor components can be damaged

during operation. Preventive maintenance should occur within the

service intervals of the machine/system.

Check of Motor and Auxiliary Components

The following points, among others, should be observed during the

preventive check of motor and auxiliary components:

• Seal of liquid cooling, hoses and connections

• Condition of power can encoder cables

Electrical Check of Motor Components

An electrical defect of a stator can be checked by measuring electrical

characteristics. The following variables are relevant:

• Resistance between motor connecting wires 1-2, 2-3 and 1-3

• Inductance between motor connecting wires 1-2, 2-3 and 1-3

• Insulation resistance between motor connecting wires and guides

The measured values of the resistance and inductance can be

compared with the values specified in chapter 4, “Technical Data”. The

individual values of the resistance and inductance measured between

connections 1-2, 2-3 and 1-3 should be identical within a specific

tolerance. There can be a phase short-circuit, a fault between windings,

or a short-circuit to ground if one or more values differ significantly.

Note: If the measured values differ to a great degree, consult the

Bosch Rexroth customer service department.

The insulation resistance – measured between the motor connecting

wires and ground – should be at least 1 MΩ.

Note: If the resistance is too low, consult the Bosch Rexroth

customer service department.

Resistance and inductance

Insulation resistance