| a. |
Check for physical
damage of any part or component in the panel.Depending
upon the extent of damage/critical component damaged
the commissioning engineer can decide whether to Power
ON the panel
|
| b. |
Check completeness
of panel with respect to Drawing.
|
| c. |
The armour of the
power cable should be grounded at the panel end .The
control cables and ACdrive output cables should not
be laid next to each other.
|
| d. |
Check that the input
and output stage cabling is not interchanged.
|
| e. |
Ensure that the N
terminal of the ACdrive is not connected to neutral
of incoming supply.(N stands for the negative of dc
supply)
|
| f. |
Ensure that the incoming
voltage is within specified limits.High voltage at the
input may be present due to long incoming cables(Ferrantieffect).This
effect may be nullified by connecting a small load on
this feeder at the drive end.
|
| g. |
Check for interconnection
between Drive Panels external control cabling ,external
choke and motor connections.They should be as per Drawing
|
| h. |
Check all bus-bars
and links for tightness.
|
| i. |
Ensure that the Earth
Bus-bar of the plant is connected to the Drive panel.Check
continuity of the intercubical Earth stripe
|
| j. |
Ensure no momentary
shortcircuiting between input and output stage takes
place during changeover from ACdrive to DOL mode or
vice-versa.
|
| k. |
The Power pack should
not be meggered.
|
| l. |
Ensure the connections
from IGBT to Gate-driver board are in place.This involves
opening up of the AC drive,therefore,the connections
need to be restored while closing the AC drive.
|
| m. |
Check
the healthiness of the IGBT's as per following chart
using a DMM:
U,V,W
w.r.t. P bus & N bus w.r.t. U,V,W should show positive
diode drop.
P bus w.r.t. U,V,W w.r.t. N bus
should show open circuit
where
U,V,&W are ac drive power output terminals,
Pis dc bus positive terminal&
N is the dc bus negative terminal.
|
| n. |
Check motor specifications
as per the test certificate and thatof the drive panel
as per drawing to ensure correct motor usage.
|
| o. |
Check
whether motor megger values are as per motor specifications.Motor
power cables to be meggered with a 1.5KV megger.The
value should be greater than 100 megaohms.
|
