Drain Pump; Working Principle; Possible Cause Of Malfunction; Technical Data - Panasonic NP-6R2MUQNZ-NZ Service Manual

5.4.

Drain Pump

5.4.1.

Working Principle

Drain pump consists of electrical motor, impeller, inlet and outlet.
Drain pump is a kind of pump driven by permanent magnet synchronous motor. The rotor is made with permanent magnet material,
the running inertia of rotor is very small, the stator consist of silicon steel stack and coil. When the drain pump is on power, the rotor
will be very easy to start.
5.4.2.

Possible cause of Malfunction

1. The motor coil is broken, so the drain pump can't work. It will cause the E2 , E4 or E1 error.
2. The magnetism of motor rotor is weak, so drain pump cannot work. It will cause the E2, E4 or E1 error.
3. The connector is loose, so the drain pump can't work. It will cause the E2, E4 or E1 error.
4. The rotor is locked by residues, so the drain can't work . It will cause the E2, E4 or E1 error.
5. The drain pump assembly rack is loose, it will cause noise.
6. The non-return valve is bad, the remain water is too much.
Explanatory notes: failure of drain pump may cause E1, because
5.4.3.

Technical data

Nominal voltage 220-240VAC
Frequency 50Hz
Resistance 167 10%kΩ
Delivery height 1M
Delivery performance
17l/min(230VAC)
18