Publication 2364F-5.05 - March 1999
Testing Components
4-11
4. Set meter to test resistance.
5. Check the resistance of each burden resistor. Replace any burden
resistors that do not comply with the specifications give in Table 4.G.
Table 4.G: Burden Resistor Specifications
6. Check all wiring connections on the isolation board and verify that SW1
is set appropriately (115V AC).
7. Set meter to test AC voltage. While applying power to the unit, check
the voltage across the bus control relay (TB6-6 to TB6-9). The voltage
should rise to 115V AC during precharge, then drop to zero after
precharge.
If the board has failed any of these tests, or if the unit continually faults with
the items shown in Table 4.H, the board may be damaged. Consider
replacing the board and/or sending the board to Rockwell Automation for
repair.
Table 4.H: Typical Faults–Possibly Involving Isolation Board
Current
Code
Rated Input
Voltage
Rated Resistance
(Acceptable Readings)
J
380/460
8.87 ohm
(8.84-9.31 ohm)
J
575
11.0 ohm
(10.45-11.55 ohm)
K
380/460/575
7.5 ohm
(7.12-7.88 ohm)
L
380/460
6.19 ohm
(5.88-6.50 ohm)
L
575
7.15 ohm
(6.79-7.51 ohm)
M
380/460
4.02 ohm
(3.82-4.22 ohm)
M
575
4.53 ohm
(4.30-4.76 ohm)
N
380/460
3.01 ohm
(2.86-3.16 ohm)
N
575
3.40 ohm
(3.23-3.57 ohm)
Fault Number
Fault Name
17
Board Intlk
20
Zero Seq Err
21
Phase Lock Loop
22
Phase Loss
27
I Offset Err
