SJE-Rhombus VFDC-4100 Controller User Manual
21
Chapter 6
6.1 Fault Alarm Display & Corrective Action
6.1.1 High Pressure Alarm
6.1.2 Low Pressure Alarm
6.1.3 Low Water Level Alarm
6.1.4 Sensor Fail/Open Circuit
6.1.5 P1 HOA/VFD, P2 HOA/VFD etc.
Cause:
The discharge pressure was higher than the HIGH
Limit Pressure while the system was operating.
Reset:
Auto reset clear. The discharge pressure drops below
the High Limit Pressure and the system has stopped.
Output:
LCD Display/ERROR LED/BUZZER
Actions:
Please check the pipe and system.
Cause:
The discharge pressure was less than the Low Limit
Pressure while the system was operating. Indicative of
a broken pipe.
Reset:
If the discharge pressure rises above Low Limit
Pressure before the Low Pressure Alarm, the pumps will
not stop. If not the pump stop and will require a manual
reset.
Output:
LCD Display/ERROR LED/BUZZER
Actions:
Please check for broken pipes and leaks. The system
will stop if the alarm is active for longer than the set time
(refer to 3.2.4). Press RESET to clear this fault.
Cause:
Low suction pressure was detected by a pressure
switch (optional) on suction piping present while the
system was operating.
Reset:
If LOW SUCTION RST is set to MANUAL, the RESET
button must be pressed to clear the alarm. If set to
AUTO, the alarm will clear itself based on the LOW
SUCTION RST TMR.
Output:
LCD Display/ERROR LED/BUZZER
Actions:
Please check the suction pressure, piping, low water
level wiring and change the low water level sensor. The
system will stop if the alarm is active for longer than
the
set time (refer to 3.2.4). Press RESET to clear. Low
suction signal must not be preset to clear alarm 3.2.4).
Press Cancel to reset and Run/Stop to run the system
again.
Cause:
The pressure sensor has failed, shorted, or opened.
Reset:
The sensor is normally operating.
Output:
LCD Display/ERROR LED/BUZZER
Actions:
Please check the connection to the pressure sensor and
replace if necessary. Press Run/Stop to run the system
after the sensor is replaced.
P1 HOA/FLT
Cause:
HAND/OFF/AUTO (HOA) selector switch is not in the
AUTO position or the VFD Error Signal was present
while the system was operating.
Reset:
Error signal was cleared after VFD reset and the system
has
stopped.
Output:
LCD Display/ERROR LED/BUZZER
Actions:
Please check that the HAND/OFF/AUTO switch is in the
AUTO position, check the wiring to the controller input
CN7, and VFD parameter
