GE Industrial Solutions AF-300E$ - Manual (Page 92)

7-1
Section 7: Maintenance and Inspection
So that the AF-300E$ drive may give long periods of
trouble-free operation and to prevent potential problems
from occuring, the following items should be periodically
inspected.
CAUTION: Do not conduct any inspections until after
disconnecting the power supply and after the “CRG” light
on the drive has gone out.
MEGGER TEST
1. Disconnect all drive terminals and never apply test
voltage to the drive when conducting an external circuit
megger test.
2. Perform the test only on the main circuit as shown in
Figure 7-1 when conducting a megger test on the drive
itself.
— Do not conduct a megger test on the control
circuits.
— Short L1, L2, L3, U, V, W, P, N, DB, and P, then
megger to ground.
3. Use a high resistance range type tester to conduct a
continuity test on the control circuits and not a megger
or a buzzer.
PERIODIC PARTS REPLACEMENT
The life of the drive will vary according to the installation
environment and the amount of running time. However, if
continuous operation is within the allowable limits, the life of
the dc Link capacitor is approximately five years and the life
of the cooling fan is approximately three years. It is recom-
mended that these parts be replaced before failure occurs.
INSPECTION ITEMS
Refer to the Inspection Items Chart in this section for
inspection points and corrective action.
Figure 7-1. MAIN CIRCUIT MEGGER TEST CONNECTIONS
MEGGER TEST OUTLINE
POWER
MEGGER
GROUND
L1
L2
L3
U
V
W
E (G)
P(+) DB
IM
•
}
•
IF SINGLE PHASE
Motor
+
–
+
–
P1
•
•
•
•
•
•
•