BENSHAW M2L 3000, Руководство пользователя

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8 – Fault Conditions
95
Table 22: Fault Conditions
Fault
Code
Fault Displayed
Reaction
Type
Description Course of Action
2
Motor overload
fault
D
Occurs when the motor thermal
overload I
2 T calculation exceeds 100%.
Parameters that can affect the motor
thermal overload I
2
T calculation
exceeding 100% include:

Motor Rated Current (DRIVE-
01)

Motor Thermal Overload Level
(FUNCTION-11)

Motor Thermal Overload Time
(FUNCTION-12)

Motor Service Factor (FUNC-
TION-14)

Motor Cooling Type (FUNC-
TION-16).
Verify that the parameters are set
appropriately for the motor, and that the
motor is not operating beyond its capability.
The overload protection can be relaxed by
setting either the
Motor Thermal Overload
Level (FUNCTION-11) higher, or setting the
Motor Thermal Overload Time (FUNCTION-
12) longer. It may even be defeated by
turning off the
Motor Thermal Overload
Enable (FUNCTION-10). Doing either of
these risks damaging the motor.
3
Inverter overload
fault
D
Occurs when the inverter thermal
overload I
2 T calculation exceeds 100%.
Contact Benshaw
20
Bus undervoltage
fault
C
Occurs when the drive is running and
the DC bus voltage drops 15% below
the expected nominal level.
If this is caused by a seasonal drop in the
utility voltage, the taps on the primary side of
the front end transformer can be moved
down 5% to boost its output voltage by 5%.
Front end transformers supplied by Benshaw
have taps for -5%, 0% and +5%.
This condition could also be caused by the
loss of one or more fuses or diodes in the
front end rectifier.
21
Bus overvoltage
fault
C
Occurs when the drive is running and
the DC bus voltage rises 20% above the
expected nominal level.
This condition could be caused by:

A seasonal rise in the utility voltage.
The taps on the primary side of the
front end transformer can be moved
up 5% to reduce its output voltage by
5%. Front end transformers supplied
by Benshaw have taps for -5%, 0%
and +5%.

The motor regenerating due to de-
celerating too quickly. Lengthen the
Deceleration Ramp Time (DRIVE-
14).

Oscillations in current (which can be
viewed in the Meter Trending func-
tion, or often heard in the motor).
Contact Benshaw for assistance.
22
Bus undervoltage
fault 2
C
Occurs when the drive is running and
DC bus voltage drops 50% below the
expected nominal level for 50
milliseconds. This is typically due to a
brown out or loss of medium voltage.
If line power quality monitoring equipment is
installed on the feed to the drive, verify that
all three phases of medium voltage are
present and energized.
If all three phases of medium voltage are
present and energized, and the drive lineup
contains a fused disconnect switch, de-
energize the supply to the fused disconnect
cabinet and check its fuses. Contact
Benshaw in the case of a cleared fuse.