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4
Field Current Limiting Alarm
The Field Current Limit protection feature limits the
amount of DC current that flows in the exciter. It is
engaged if load conditions require a field current
larger than the limit. Under such conditions, the
current is limited to the Field Current Limit value in
DVRPortal™. The HMI and DVRPortal™ display this
alarm condition.
Power Limiting Alarm
The Power Limit protection feature limits the amount
of output power from the generator by modifying
voltage to maintain constant output power at the
limit. The HMI and DVRPortal@ display an alarm
when this condition is met. This limiter can be
enabled or disabled in the Protection Settings Tab
in DVRPortal@ under the Limits panel. The limiter
dynamics (PID gains) can also be adjusted in the
Operating Modes Tab in DVRPortal@.
Loss of CAN Communication Alarm
The Loss of CAN Communication protection feature
indicates an alarm if communication traffic between
the DVR
®
and any Electronic Control Unit (ECU) on
the CAN bus. The alarm is triggered if the regulator
does not receive a “VR Heartbeat” message within
the threshold time. Refer to the DVR2000E+/EC+
CAN Bus Interface User Guide for details.
Features and Protection
Figure 4-3. Examples of Under Frequency and Slope
Note: Arrows indicate hysteresis of cut-in and cut-out transitions between IDLE and RUN states.
GPN046 04-13.indd 16 4/5/13 10:24 AM
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