bonitron M3645P, Reference Manual

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M3645P
38
▪
Make sure the unit has power and is enabled. The "Ready" output will
close if the unit is ready to operate. (4.5.2)
▪
See if there are any faults reported.
▪ Check DC bus voltage at fuses.
▪
Check DC bus polarity at fuses.
▪ Check DC bus fuses for continuity.
▪ Ensure unit is not faulting during operation. Some faults may clear
themselves, such as phase loss, but fault recall will show that they have
occurred. Check the fault records to see if the unit has recorded faults
that would cause the operation to stop regenerating, resulting in a drive
overvoltage.
▪ Confirm that the unit is properly sized. If the braking energy is too high
for the unit to regenerate, the unit will go into current limit, which will result
in an uncontrolled bus voltage rise. The current being regenerated can
be checked with the digital display or with a separate meter in the DC
link. If the unit is operating in current limit, it may be undersized for the
application.
▪ If the M3645P is connected to the AC line through a transformer, the
transformer may not be large enough to handle the regenerated currents.
See section 3.4.1.1 for transformer sizing instructions.
▪ With 150A, 225A, and 300A units, confirm that the phase rotation of the
AC control power connections between the reactor and the transistor
module match the power connections.
5.3.5.
F
EEDBACK
U
NDERVOLTAGE
Reset the M3645P by toggling the enable input. (4.5.2)
If the fault returns, contact Bonitron for assistance.
5.3.6.
O
VERTEMPERATURE
Check the ambient temperature. If the temperature is above 40°C, the unit
may not be able to cool properly at full load. Ensure that there is adequate
clearance and airflow in the area where the Regen is installed.
Check to make sure the fan is operating. The fan will operate for a few
seconds after power up. Cycle power to the unit and listen for the fan
operation. If it does not operate, check for obstruction.
If the unit is cool and still showing an overtemperature condition, contact
Bonitron for assistance.
If an overtemperature fault is listed in the fault log in conjunction with a
Precharge Not Complete fault, this indicates that control power to the unit has
been reset. No actual overtemperature condition has occurred.
5.3.7.
DC
OVERVOLTAGE
If the M3645P indicates a DC bus overvoltage fault, this typically indicates
incorrect installation or damage to the unit. The M3645P only indicates this
fault if the DC bus registers as over 1000 VDC. For units of L-, E-, or H-
voltage classes this is not generally possible. For units of the C- voltage
class, check all the conditions described in Section 5.3.34.
Confirm that the system topology matches the diagrams shown in section 3
of the manual.
Confirm with a voltmeter that the DC bus polarity matches the markings on
the unit.