Pumpex K 152, Инструкция по эксплуатации, Страница: 8 / 16

8 (15)
SERVICE INSTRUCTION
K 152, 202, 203, 252, 302
K152/202/203/252/302.58.0101.Eng/Digital
Exchange of Stator Unit
If the motor overload protector has tripped repeated times, the
stator should be checked. Remove the junction box cover.
Remove the motor cable leads from the terminal board.
Record the colours of the cable leads and corresponding
terminal board letters (or numbers).
Check the stator insulation by using a 500 V megger. The
megger reading should exceed I megohm between the winding
phases as well as between the windings and ground (stator
housing). If the insulation resistance is below 1 megohm the
stator unit should be dried in an oven, the temperature pre-
ferably not to exceed 90°C.
Check the circuit of the three (3) built-in thermal contacts for
continuity, using an ohm meter or bridge. If the circuit is open
the defective contact should be identified by checking each
individual thermal contact. The faulty thermal contact can be
bypassed in accordance with the wiring diagram on page 9.
If stator insulation reading after drying is still low, the stator unit
should be replaced. Remove terminal boards (and terminal
board plate). The defective stator unit (stator and stator housing)
should be sent to the nearest service point in exchange for a
rebuilt unit.