z NOTE: If one dedicated bypass is set to "fan" and if no digital input are assigned as a Bypass Confirm input, this test will always
pass.
LED Display LCD Display (BIST Mode)
b bc (bypass closed) Bypass Closed
b bo (bypass open) Bypass Open
Step 4– Sequential SCR gate firing (L1+, L1-, L2+, L2-, L3+, L3-):
In this test the SCR gate outputs are sequentially fired starting with the L1+ device(s) and ending with the L3- device(s). This test can
be used to verify that the SCR gate leads are connected properly. In LV systems, the gate voltage can be verified using a DC voltage
meter or oscilloscope. The voltage on each red and white wire pair should be between 0.5VDC and 2.0VDC.
LED Display LCD Display (BIST Mode)
b 96 (gate 6 on) Gate 6 On
b 93 (gate 3 on) Gate 3 On
b 95 (gate 5 on) Gate 5 On
b 92 (gate 2 on) Gate 2 On
b 94 (gate 4 on) Gate 4 On
b 91 (gate 1 on) Gate 1 On
Step 5– Simultaneous SCR gate firing:
In this test the SCR gate outputs are simultaneously fired (all gates on). This test can be used to verify that the SCR gate leads are
connected properly. The gate voltage can be verified using a DC voltage meter or oscilloscope. The voltage on each red and white wire
pair should be between 0.5VDC and 2.0VDC.
Pressing [ENTER] on the keypad at any time will abort the current test in progress and proceed to the next BIST test.
During the standard BIST tests if line voltage or phase current is detected, the MX
2
will immediately exit BIST mode and declare a
“BIST Abnormal Exit” fault.
LED Display LCD Display
b 9A (all gates on) All Gates On
Step 6
LED Display LCD Display
b-- (tests completed) Tests completed
8.6.2 Powered BIST Tests:
(P67 / #8) / FUN 15 - Powered BIST
The powered BIST tests are designed to be run with normal line voltage applied to the starter and a motor connected. Powered BIST
verifies that the power poles are good, no ground faults exist, CTs are connected and positioned correctly and that the motor is
connected. Powered BIST mode can be entered by entering the appropriate value into the FUN 15- Miscellaneous Command user
parameter.
z NOTE: The powered BIST test is only for use with SCR based reduced voltage soft starters. Powered BIST can not be used with
wye-delta or ATL types of starters.
189
8 - TROUBLESHOOTING & MAINTENANCE
BIST Mode
Bypass Closed
BIST Mode
Bypass Open
BIST Mode
Gate G ? On
BIST Mode
All gates on
BIST Mode
Tests completed
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