17
TAURUS™ VS Variable Speed Pump Installation and User’s Guide
Troubleshooting (Cont.)
Problem Possible Cause
Corrective Action
Pump runs without flow.
Impeller is loose
Air leak
Clogged or restricted plumbing
Check that pump is spinning by looking at fan on back
of pump. If so, check that pump impeller is correctly
installed.
Check plumbing connections and verify they are tight.
Check for blockage in suction side piping.
Checked for blockage in discharge piping including
partially closed valve or dirty filter.
Errors and Alarms
If an alarm is triggered the drive’s LCD screen will display the fault code text and the Taurus™ VS Variable Speed
Pump will stop running. Disconnect power to the pump and wait until the keypad LEDs have all turned off. At this
point, reconnect power to the pump. If the error has not cleared then proper troubleshooting will be required. Use
the error description table below to begin troubleshooting.
21 – Communication Link between the HMI and Motor control has been lost: Check the jacketed wire on
the back side of the keypad inside the drive top cover. Ensure that the 5 pin connector is properly plugged into the
socket and that there is no damage to the cable.
1A – Power Module over current detected: If this error displays multiple times, then there may be a problem
with the pump’s rotating assembly. Please disassemble the pump and investigate to see if there is a problem with
the impeller or mechanical seal. See page 14 “Pump Disassembly” for instructions for disassembling the pump.
0F – Absolute AC Under Voltage Detected: This indicates that the supply voltage has dropped below the
operating range of 99v. This could be caused by normal voltage variation and will clear itself. Otherwise there
could be excess voltage sag caused by improper installation or improper supply voltage.
17,16, 02, 08, 04, 06, 09, 0A – Internal Errors: These errors can occur based on operating conditions
and the UL 60730 required self-diagnostic safety software. If they do not clear after multiple restart attempts the
drive should undergo a hard power cycle. Disconnect main power by turning off the breaker long enough for the
keypad LEDs to turn off. After power is reconnected if one of these errors continues to reappear, the drive may
need service.
Communication link between HMI and motor control has been lost
Power Module over current detected
Phase Current Offset out of range
Phase Current Imbalance detected
Absolute AC under voltage detected
Absolute Phase current limit exceeded
Absolute Diode Bridge temperature limit exceeded
Absolute Power Module temperature limit exceeded
Absolute Power Factor Correction (PFC) temperature limit exceeded
DC bus over voltage detected
DC bus under voltage detected
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