GE SPEEDTRONIC Mark V Troubleshooting Chart page 2

Alarm 1
066 L43MAINT
067 L5E_ALM
068 L86MP
069 L4ETR_FLT
070 L12H
071 L12HFD_C
072 L12H_P_ALM
073 L12HFD_P
074 L83HOST
075 L12HBLT_ALM
076 L30TNH_DIFF
076 L30TNI_DIFF
077 L12L
078 L12LFD_C
079 L12L_P_ALM
2
SPEEDTRONIC Mark V Annunciator Troubleshooting Chart
Maintenance — Forcing Auto calibrate, memory
Mode Enable changing or logic forcing
mode of operation has
been selected.
Manual Trip The emergency stop push–
button has been pressed.
Master Protective Startup Within the turbine control
Lockout panel the three micropro-
cessor controllers R, S and
T are in disagreement for
the proper condition of the
Master Protective logic
"4X".
Protective Module ETR Trip due to master protec-
Relay Trouble tive relay (4's) circuit has
a problem.
Electrical Over speed The speed control system
Trip — HP has not limited HP turbine
speed within the trip lim-
its.
Control Speed Signal HP speed pickup voting
Trouble — HP mismatch in <C>.
Protective Module Over- <P> module HP overspeed
speed Trip — HP trip.
Control Speed Signal HP speed pickup voting
Trouble — HP mismatch in <P>.
Overspeed Test Mode Se- HP overspeed trip being
lected — HP tested.
Overspeed Bolt Trip — HP The speed control system
has not limited turbine
speed within the trip lim-
its.
HP Speed Signal Differen- One of the HP speed sen-
tial Alarm sors is showing a different
speed than the other two.
IP Speed Signal Differen- One of the IP speed sen-
tial Alarm sors is showing a different
speed than the others.
Electrical Overspeed The speed control system
Trip — LP has not limited LP turbine
speed within the trip lim-
its.
Control Speed Signal
Trouble IP
Protective Module Over- <P> module LP overspeed
speed Trip — LP trip.
When done with the operation, deselect the
operation.
Correct abnormality that caused the opera-
tor to push the emergency stop push–button.
Determine which controller is in disagree-
ment with the other two.
Isolate <P> Protective Module and correct
the problem.
Isolate problem and correct.
Check and recalibrate HP speed pickups.
Investigate cause of overspeed.
Check and recalibrate HP speed pickups.
See "Overspeed Trip Checks" section of
text.
Isolate problem and correct.
Check HP speed pickups.
Check IP speed pickups.
Isolate problem and correct.
Investigate cause of overspeed.