How to Maintain the Chassis
Functions
The chassis mechanism is used to rack the device in and out.
The sliding connections between the chassis and device are made up of two parts: clusters and disconnecting contacts. Grease between the clusters and the disconnecting contacts facilitates the connection and avoids damaging the silver-coated surface by reducing the racking-in friction.
Degradation Factors
The factors which can cause degradation of the chassis are the following:
-
Dusty environment
-
Shocks
-
Corrosive atmosphere
-
Idle for long periods of time
-
Incorrect operation
Potential Hazards
Performing regular maintenance on the chassis can help to avoid the potential hazards and consequences listed in the following table.
|
Hazard |
Consequence |
|
|---|---|---|
|
Personal injury |
Equipment damage |
|
|
Safety shutter malfunction |
Electric shock |
– |
|
Device remains jammed in connected position. |
– |
Jammed operation of the device in the chassis (racking-in and racking-out) |
Preventive Action
The following table lists the preventive maintenance procedures to be performed to maintain the chassis.
|
Maintenance program |
Preventive action |
Procedure |
|---|---|---|
|
Basic end-user preventive maintenance |
Check device racking operation. |
Chassis NII_1_1 |
|
Standard end-user preventive maintenance |
Check operation of safety shutters. |
Chassis NIII_2_3 |
|
Clean chassis and check presence of grease on chassis. |
Chassis NIII_2_1 |
|
|
Check disconnecting contact clusters. |
Chassis NIII_2_2 |
|
|
Manufacturer preventive maintenance |
Check connection/disconnection torque. |
Contact your Schneider Electric field service representative. |
|
Clean and regrease chassis of MasterPact NT/NW drawout devices. |
For more information, refer to Preventive Maintenance Programs.