18 Rockwell Automation Publication 7000-TG002J-EN-P - March 2015
Chapter 1 Fault Messages
X DBSE1DiagFbkLoss 520 This is an offline Symmetrical Gate Commutated Thyristors
(SGCT) fault on the DB side and indicates that the drive did
not sense the proper diagnostic feedback before and after the
diagnostic gating. It is likely that the feedback fiber-optic
cable is not plugged in or has been damaged.
• Check that the fiber-optic cables are seated properly in the optical interface board and the
SGCT firing card.
• Check that the fiber-optic cable is not pinched or damaged.
• Complete a resistance check per the instructions in the manual.
• NOTE: SGCTs may not have completely shorted, and still could read in the k range – Any
devices with low suspect readings should be changed.
• Check the LED status of the SGCT gate driver card for abnormal readings.
• Complete a Gating Test mode check on the devices.
• Verify the associated 20V power supply is powered and active.
• Verify all the power connections to the SGCT firing card are seated properly.
XDBSE2DiagFbkLoss521
XDBSE3DiagFbkLoss522
XDBSE4DiagFbkLoss523
XDBSH1DiagFbkLoss524
XDBSH2DiagFbkLoss525
XDBSH3DiagFbkLoss526
XDBSH4DiagFbkLoss527
X DBSE1GatingLoss 528
X DBSE2GatingLoss 529
X DBSE3GatingLoss 530
X DBSE4GatingLoss 531
X DBSH1GatingLoss 532
X DBSH2GatingLoss 533
X DBSH3GatingLoss 534
X DBSH4GatingLoss 535
X DBSE1Offline 536 This SGCT device on the DB side was detected to be faulted
after the input contactor was closed or following a start
command or following a drive reset. After isolating the drive
from MV, ensure that the device, IGDPS power supply and the
fiber-optic signals are not damaged.
• Complete a resistance check per the instructions in the manual.
• NOTE: SGCTs may not have completely shorted, and still could read in the k range – Any
devices with low suspect readings should be changed.
• Check the LED status of the SGCT gate driver card for abnormal readings.
• Complete a Gating Test mode check on the devices.
• Verify the associated 20V power supply is powered and active.
• Verify all the power connections to the SGCT firing card are seated properly.
XDBSE2Offline537
XDBSE3Offline538
XDBSE4Offline539
X DBSH1Offline 540
X DBSH2Offline 541
X DBSH3Offline 542
X DBSH4Offline 543
All Drive Types
PF7000A
PF7000B
PF7000C
Marine Drive
Heat pipe Drive
Fault Message Fault Code Description Recommended Action(s)
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