9469300994 9-21
DGC-2020HD Troubleshooting
• Baseload Setpt: This displays the active baseload setpoint.
• Peak Shv Setpt: This displays the active peak shave setpoint.
• Im/Ex Setpt: This displays the active import/export setpoint.
VRM Control
This screen is useful for debugging VRM-2020 control related issues. It gives visibility into the states of
the VRM-2020 regulation modes and limiters in the DGC-2020HD.
The VRM Control diagnostics screen is located on the front panel at Metering > Diagnostics > VRM
Control.
The following parameters are visible on the VRM Control diagnostics screen:
• VRM AVR Setpoint: This displays the AVR mode setpoint.
• VRM FCR Setpoint: This displays the FCR mode setpoint.
• VRM AVR Ref: This displays the final AVR setpoint (reference) after other factors such as raise/lower
biases or an active limiter.
• VRM FCR Ref: This displays the final FCR setpoint (reference) after other factors such as raise/lower
biases or an active limiter.
• VRM Control Output: This displays the VRM control output (PID) in per unit.
• VRM AVR Error: This displays the difference between the AVR reference and the measured voltage
in per unit.
• VRM FCR Error: This displays the difference between the FCR reference and the measured current
in per unit.
• VRM OEL Reference: This displays the calculated OEL reference in per unit of takeover OEL or
summing point OEL depending on configuration.
• VRM OEL Takeover Err: This displays the difference between the takeover OEL reference and the
measured field current in per unit.
• VRM OEL Summing Err: This displays the difference between the summing point OEL reference and
the measured field current in per unit.
• VRM OEL Summing Bias: This displays the OEL Summing control output (PID) in per unit.
• VRM UEL Reference: This displays the calculated UEL reference in per unit.
• VRM UEL Error: This displays the difference between the UEL reference and the measured field
current in per unit.
• VRM UEL Bias: This displays the UEL control output (PID) in per unit.
• VRM Tracking Error: This displays the difference of the inactive mode setpoint in relation to the active
mode setpoint in percent.
• EDM Ripple: The exciter diode ripple is reported by the exciter diode monitor (EDM) as the induced
ripple in the exciter field current.
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