3-46 Troubleshooting
7000-TD002A-EN-P – September 2007
WARNING
MESSAGE
WARNING
CODE
DESCRIPTION RECOMMENDED ACTIONS
Motor OvrVoltage 139 The measured motor ac voltage or Stator
Voltage (#P344) has exceeded Motor
Overvoltage Trip (P181) for the duration set
in Motor Overvoltage Delay (P182), but this
has occurred with the drive NOT gating (as
in a Sync Transfer event)
Possible Causes:
– Make sure the motor is connected to the
drive and there is no open circuit at the
drive output when started in normal
mode
– Self-Excitation -Check for flying
start/induced motor rotation
– Noise from contactor closure
Motor Protection 77 Standard External Fault/Warning Input
included allowing the end-user to install a
protective relay (IE Bulletin 825 Motor
Protection Relay) auxiliary contact that can
activate a drive fault or warning, depending
on configuration of Motor Prot Class (P443).
– See associated Fault Description
– Verify the alarm and ensure that there is
no damage to the motor. Also check the
120V wiring and the XIO card
No Output Ctctr 196 This warning will happen in Open Circuit test
mode and indicates that there is no output
contactor programmed in the drive. Verify
the parameter settings and ensure that the
output of the drive is truly open-circuited.
– If there truly is no Output Contactor in the
system, then you can mask the fault.
Then there will be a No OP Ctctr
warning, and you can continue with the
test.
– ENSURE THE OUTPUT OF THE DRIVE
IS TRULY OPEN-CIRCUITED
– If there is no output contactor then you
MUST disconnect motor cables from the
drive in case running Open Circuit Test.
No Tach Installd 150 The drive has sensed that there is no
tachometer/encoder connected, but the
Speed Feedback Mode (P89) has been set
to Pulse Tach. Verify tach requirement for
system and change the tach configuration
parameter Tach Type (P233).
– Verify whether there is a tachometer
required for the system, and set the
parameter Speed Feedback Mode
accordingly.
– Investigate the tachometer for damage
– Verify the wiring from the drive to the
tachometer is per the Electrical Drawing
– Verify the +15VDC supplying the
tachometer is not low/missing.
NVRAM Cleared 96 The drive parametrs are corrupt and have
been initialized to default values. This
happened either during firmware upgrade or
if the battery was low. Reload paramters.
– Reload parameters from Terminal
Memory, DriveTools, Flashcard, or from
a hardcopy.
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