User’s Manual
33
4.4. FAULTS
The M3645 monitors a number of different fault conditions which prevent the regen
from operating. Some faults latch until they are reset by toggling the enable input.
Faults that do not latch will automatically clear when the fault condition is no longer
present. Every fault opens the Ready output contact (4.5.5).
On units with a digital display, the display stores the last 50 fault records (4.3.5). On
units without a digital display only the most recent fault state can be viewed. The unit’s
most recent fault state may be accessed by disabling the unit (4.5.2), then setting the
Fault Recall Input (4.5.3) high. The red Not Ready LED (4.2.2.3) will blink out all the
faults of the most recent fault state, in sequence.
Table 4-1: Blink Codes
4.4.1. FEEDBACK UNDERVOLTAGE
This fault indicates that the M3645's DC bus feedback circuitry has failed.
This fault will latch until manually cleared by toggling the Enable Input. If this
fault does not clear, it typically indicates that damage to the M3645 has
occurred and must be repaired.
4.4.2. OVERTEMPERATURE
This fault indicates that the regen unit has exceeded its safe operating
temperature. This fault will automatically clear when the unit's temperature
has returned to a safe level.
4.4.3. DC OVERVOLTAGE
This fault indicates that the DC voltage on the bus has exceeded 1000V. This
fault latches until manually cleared.
4.4.4. DIFFERENTIAL OVERVOLTAGE
This fault indicates that the DC bus is more than 200V higher than the AC
line peak. This fault latches until manually cleared by toggling the Enable
input.
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