Allen-Bradley 1395, Руководство по устранению неисправностей

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2-16 Malfunctions with Indications
VP-14 SCR Overtemp
(Selectable)
(Parameter 101
bit 4 when
Parameter
630=1) This fault occurs when the thermal switch mounted
on the heat sink remains open for 1 time specified
by parameter 726. The switch is designed to open
above a temperature of 85 degrees C. This fault is
type selectable as either Soft or Warning. A Soft
Fault selection will cause a controlled stop to be
initiated. The fault is caused by excessive heating of the drive heat
sink. Below are a list of things that may have contributed to
the occurrence of the fault.
1. The ambient air temperature around the drive has
exceeded the 60 degrees C rating. Determine the cause
of the excessive ambient temperature and correct. Allow
the drive to cool prior to executing a Clear Fault and
continuing.
2. The failure of cooling fans if the drive is so equipped.
Verify that all fans are fully operational and that the air
flow to the fans is not obstructed or restricted in any way.
Execute a Clear Fault when the heat sink temperature has
been reduced to the point where the switch has closed.
3. The output rating of the drive has been exceeded which
has caused excessive heat build up in the heat sink. Verify
that the drive output rating is correct for the application.
Allow the drive to cool and execute a Clear Fault to
continue operation.
4. The Heat Sink Thermal switch (HST) or associated circuit
malfunction. Remove all power to the drive. Check the
connections to the switch which is located in the middle of
the heat sink. Check, in a cool ambient, that the switch is
closed by measuring the resistance between the two
terminals, replace switch if found inoperative. If the fault
occurs again replace the Main Control Board.
5. On MkVA & HkVA drives, check the vane switch assembly.
VP-15 External
Overtemp
(Selectable)
(Parameter 101
bit 5 when
Parameter
630=1) This fault occurs when the motor temperature
discrete input (TB3-1 & 2) is low for a time greater
than specified in parameter 725. This discrete input
is usually connected to an internal thermal switch
in the motor. It could however be connected to any
normally closed switch external to the drive. One
second after the switch opens the drive will fault.
This fault is type selectable as either Soft or
Warning. A Soft Fault selection will cause a
controlled stop to be initiated. Correct the condition which caused the external switch to
open. Execute a Clear Fault and continue operation. If this
input is not used, connect it to the appropriate control
voltage to eliminate Warning Fault occurrences.
VP-16 Thermal
Overload
Pending
(Warning)
(Parameter 101
bit 6 when
Parameter
630=1) This fault will be issued any time the average motor
armature current exceeds the level specified by
720 “Ovld Pend Level.” It is used to indicate that the
present armature current output exceeds the level
specified by the user and continued operation at
this level may cause damage to the motor and/or
process. This fault can be disabled. Refer to
parameter 632. No action is required for continued operation. However,
depending on the application it may be useful to monitor this
fault and take action to reduce the current output when it
occurs.
Note that a malfunctioning encoder could cause a VP-16
and a VP-39 as well.
Velocity Processor Faults
No. Name Description Recovery
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