Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 56)

Appendix A. CPEC200 Diagnostics
This usually means the CSAT3A sensor head is not connected to the
EC100.
• ERROR: Sonic problem - Check diag_sonic is displayed when a bit is
set in diag_sonic. This usually means the sonic path is blocked. If
there is no obvious reason for the problem, such as water on the face
of a transducer, contact Campbell Scientific for assistance.
pump_status
Public variable pump_status gives the status of the pump and is based on the
state of several variables.
• Pump is OK is displayed if the pump flow is within 10% of the
setpoint ( pump_flow_OK = True).
• Pump is OFF - Set pump_ON = True to restart it is displayed if the
pump is turned off ( pump_ON = False). This is not necessarily an
error condition. It normally arises when the user intentionally turns
the pump off to perform a manual zero/span, for example. For this
reason, this condition does not set a bit in cpec_diag.
• ERROR: Pump is disabled - Check BattVolt is displayed if the battery
voltage has dropped below the minimum and the CPEC200 has
disabled the pump. This correlates with BattVolt_OK = False. See
notes for bit 9.
• ERROR: Pump is disabled - Check pump_tmpr is displayed if the
pump temperature is outside its operating range. This correlates with
pump_tmpr_OK = False. See notes for bit 5.
• ERROR: Pump is disabled - IRGA is OFF is displayed if the
CPEC200 has stopped the pump because the IRGA is off. This
correlates with irga_OFF = True and could be a result of the EC155
automatically powering down because its source temperature is
outside its operating range. See the EC155 manual for details.
• ERROR: Pump flow is NAN is displayed if pump_flow = NAN. This
indicates a problem with the pump speed measurement. See notes on
bit 6.
• ERROR: Pump flow is not at setpoint - Check buff_depth is displayed
if the pump flow is not within 10% of the setpoint ( pump_flow_OK =
False) and the processing has fallen too far behind (buff_depth_OK
= False). A processing delay does not always cause a pump flow
error. In many cases, the processing will catch up before the pump
flow drifts too far from the setpoint. For additional information see
notes on bit 4.
• ERROR: Pump flow is not at setpoint is displayed if the pump flow is
too far from the setpoint and the problem cannot be explained by one
of the conditions listed above. For additional troubleshooting advice,
see notes on bit 6.
valve_status
Public variable valve_status gives the status of the optional valve module
(either the three- or six-valve module) and is based on the state of several
variables.
If the program is not configured to use the optional valve module (constant
VALVE_MODULE = False), then valve_status will always display Program
not configured for valve operation - Set VALVE_MODULE = True and
recompile. See Section 5.4.2, Compile Switches, for details on configuring the
CPEC200 program for valve module operation.
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