Allen-Bradley 1395, Руководство по устранению неисправностей

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Malfunctions with Indications 2-17
VP-17 Thermal
Overload Tripped
(Selectable)
(Parameter 101
bit 7 when
Parameter
630=1) This fault occurs when the armature current output
to the motor exceeds the overload curve
characteristics selected by the user in parameter
629 “Mtr Overload Sel”. Motor thermal overload
protection is based on the square of armature
current feedback and the selected overload
coefficients. Four different coefficients can be
selected through parameter 629, “Mtr Overload
Sel”
This is type selectable as Soft or Warning. Soft
Fault selection will cause a controlled stop to be
initiated.
1. Determine the cause for the increased load which caused
excessive armature output to the motor and correct.
Execute a Clear Fault and continue operation.
2. Coefficients selected may not match motor thermal
characteristics, change overload curve as selected.
VP-18 Motor Stalled
(Selectable)
(Parameter 101
bit 8 when
Parameter
630=1) Occurs when the armature current output is at
current limit and motor velocity is within the zero
speed tolerance for a time period greater than the
specified time delay. The armature current limit
levels are specified in parameters 663 “Fwd Brdg
Cur Lim” & 664 “Rev Brdg Cur Lim”. The zero
speed tolerance level is specified in parameter 710
“Zero Speed Tol” and the delay time in parameter
727 “Stall Delay”. Fault is type selectable as Soft or
Warning. A Soft Fault selection will cause a coast
stop to be initiated. Determine the cause of stalled condition and correct. Verify
the associated parameters are correctly setup. Verify that
the field is functioning properly. Without proper field, the
torque output may be insufficient even at high armature
current levels. Execute a Clear Fault and continue operation.
VP-19
(cont.)
Contactor Failure
(Soft)
(Parameter 101
bit 9 when
Parameter
630=1) This fault will occur when it takes 1 second or more
for the DC contactor to respond to a command to
open or close. It will also occur if the contactor
opens or closes without being commanded to do
so. A fault occurrence will cause a coast stop to be
initiated. A Contactor Malfunction occurs when the contactor is in a
state other than what is being commanded.
1. Loss of the contactor power. Check for 115V If not
present, check system wiring and correct. Execute a Clear
Fault.
2. Check for a loss of continuity between “M1” & “PR” when
the contactor is commanded to close. This can be
accomplished by verifying that 115V AC is present when
the contactor is commanded to close. 115 VAC is
measured as shown below.
Velocity Processor Faults
No. Name Description Recovery
Bit Description
0 Overload function disabled
1 60 seconds to trip at 150% rated motor armature
current for externally cooled motors (motors w/ blowers)
2 60 seconds to trip at 200% rated motor armature
current for externally cooled motors (motors w/ blowers)
3 60 seconds to trip at 150% rated motor armature
current for self cooled motors (motors without blowers)
4 60 seconds to trip at 200% rated motor armature
current for self cooled motors (motors without blowers)
HP 115VAC Present
1-30 HP, 230V AC
2-60 HP, 460V AC TB2-6 to TB2-3
TB2-7 to TB2-3
40-100 HP, 230V AC
75-200 HP, 460V AC TB2-8 to TB2-5 TB2-9
to TB2-5
125-300 HP, 230V AC
250-600 HP, 460V AC TB5-8 to TB5-5 TB5-9
to TB5-5
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