6.2 Maintenance activities

Code Interval code Operating hours Time period Activity

R2 Overhaul 1 24000 h 6 years • Replace the coolant • Coolant pump: Replace and overhaul in an authorized workshop • Clean the DCC - inner spaces • Visibly check the power connections / glands for abnormal color

• Check the main and auxiliary contacts of the contactors as well as the busbar connections in the DCC

4 x I4 32000 h 8 years • Cooling system: Check all of the hose connections to ensure that they are not leaking and are not porous, if required, replace hoses • Check all of the painted surfaces of the DCC for damage, repair the paint finish R3 Overhaul 2 48000 h 12 years • Replace the DCU fan assembly

Check – VI

No. Component Maintenance work

1 Entire DCC Visually check the DCC for dust, dirt, any physical damages Nil

Cross-reference

No. Component

1 Main cooler Clean

Interval 1 - EI

Maintenance work Cross-reference

Refer to Chapter 6.3

Interval 2 – I2

No. Component

1 Insulators

Maintenance work

Check and clean insulators of PTB2 terminals & motor connection terminals on DCC for dirt accumulation

2 Air conditioner Clean the heat sink fins of air conditioner from outer side of DCC

Cross-reference

Nil

Refer to Chapter 6.17

Interval 3 – I3

No. Component Maintenance work

1 Cooling system Check the level of the liquid and if required top up Refer to Chapter 6.4

Siemens Ltd. A5E01511750J/ 4M-2601-1645240 AC Shovel 295HD/ HR DCC Operation & Maintenance Manual

Cross-reference

2 Cooling system Cooling medium specimen, analysis Refer to Chapter 6.5 3 Cooling system Check that the cooling medium connection seals for leaks Refer to Chapter 6.6

4 Coolant pump Check for vibration, noise in operation, damage and leaks

5 Door gaskets Apply grease (jelly) on door gaskets to prevent adhesion/ sticking of gasket to cabinet 6 Air conditioner Check air conditioner fans Refer to the Operating Instructions of the coolant pump Nil

Nil

Interval 4 – I4

No. Component Maintenance work Cross-reference

1 DC link capacitor Check the capacitance value Refer to Chapter 6.10

2 Blower

3 DCU Check the Blower for heat exchanger Refer to Chapter 6.11 Check DCU fans SIBAS equipment manual

2 x I4 - the same activities as I4 - and in addition

No. Component Maintenance work

1 Main blower fan motor Bearings of motor: Replace in qualified workshop

2 Internal cooler Bearings of motor: Replace and overhaul in qualified workshop

Cross-reference

Refer to Chapter 6.11 and the Operating Instructions of the central fan

Refer to Chapter 6.9 and the instructions of the indoor coolers

3 Door gaskets Replace the gaskets on maintenance cover Refer to Chapter 6.16

R2 – overhaul 1

No. Component Maintenance work

1 Cooling system Replace the cooling liquid 2 Cooling medium pump Replace the coolant pump and overhaul in an authorized workshop

3 DCC

Clean the inside space 4 Switching devices Check the main and auxiliary contacts of the contactors as well as the busbar connections in the converter

Cross-reference

Refer to Chapter 6.7 Refer to Chapter 6.8

Refer to Chapter 6.12 Refer to Chapter 6.13

Siemens Ltd. A5E01511750J/ 4M-2601-1645240 AC Shovel 295HD/ HR DCC Operation & Maintenance Manual 76