User manual

z NOTE: The motor wiring MUST be fully connected before starting the powered BIST tests. Also the motor must be at rest
(stopped). Otherwise the powered BIST tests will not function correctly.
z NOTE: Before using the powered BIST test function, the following MX
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user parameters MUST be set for correct operation of the
powered BIST test: Motor FLA (P1 / QST 01), CT Ratio (P78 / FUN 03), Phase Order (P77 / FUN 04), Rated Voltage (P76 / FUN 05),
and Starter Type (P74 / FUN 07).
The powered BIST tests comprise of:
Programming / Test Instructions:
Step 1
LED Display LCD Display
Go to P67 and press [ENTER]. Go to FUN 15 and press [ENTER].
Press [UP] button to #2 and press [ENTER]. Increment up to "Powered BIST" and press [ENTER].
Powered BIST test will commence. Powered BIST test will commence.
Step 2– Shorted SCR and Ground Fault Test:
In this test each power pole is energized individually. If current flow is detected, the MX
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controller attempts to differentiate whether it
is a shorted SCR/shorted power pole condition or a ground fault condition and either a “Bad SCR Fault” or “Ground Fault” will occur.
LED Display LCD Display (BIST Mode)
b 59 -(Gating individual SCRs) Shorted SCR / GF
Step 3– Open SCR and Current Transformer (CT) Test:
In this test, a low-level closed-loop controlled current is selectively applied to various motor phases to verify that the motor is
connected, all SCRs are turning on properly, and that the CTs are wired and positioned properly. If current is detected on the wrong
phase then a “BIST CT Fault” fault will be declared. If an open motor lead, open SCR, or non-firing SCR is detected then a “Bad SCR
Fault” will occur.
z NOTE: When this test is in progress 6 audible humming or buzzing sounds will be heard from the motor.
LED Display LCD Display (BIST Mode)
b oc Open SCR / CTs
Step 4
LED Display LCD Display
b-- (tests completed) Tests completed.
Pressing [ENTER] on the keypad at any time will abort the current test in progress and proceed to the next BIST test.
z NOTE: If line voltage is lost during the powered tests a “BIST Abnormal Exit” fault will occur.
z NOTE: The powered BIST tests will verify that the input phase order is correct. If the measured phase order is not the same as the
“Phase Order” (FUN 04) parameter a phase order fault will occur.
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8 - TROUBLESHOOTING & MAINTENANCE
FUN: Misc Command
15 Powered BIST
BIST Mode
Shorted SCR/GF
BIST Mode
Open SCR/CTs
BIST Mode
Tests completed