Taco SKV SelfSensing

Taco® SKV
64 302-365, Effective: June 5, 2017
© 2017 Taco, Inc.
14.0.5 Fault Messages
The warning/alarm information below defines the warn-
ing/alarm condition, provides the probable cause for the
condition, and details a remedy or troubleshooting proce-
dure.
WARNING 1, 10 volts low
The control card voltage is below 10 V from terminal 50.
Remove some of the load from terminal 50, as the 10 V
supply is overloaded. Max. 15 mA or minimum 590
Ohms. This condition can be caused by a short in a con-
nected potentiometer or improper wiring of the potenti-
ometer.
Troubleshooting
Remove the wiring from terminal 50. If the warning
clears, the problem is with the customer wiring. If the
warning does not clear, replace the control card.
WARNING/ALARM 2, Live zero error
This warning or alarm will only appear if programmed by
the user in 6-01 Live Zero Timeout Function. The signal
on one of the analog inputs is less than 50% of the mini-
mum value programmed for that input. This condition can
be caused by broken wiring or faulty device sending the
signal.
Troubleshooting
Check connections on all the analog input terminals.
Control card terminals 53 and 54 for signals, terminal 55
common. MCB 101 terminals 11 and 12 for signals, ter-
minal 10 common. MCB 109 terminals 1, 3, 5 for signals,
terminals 2, 4, 6 common).
Check that the adjustable frequency drive programming
and switch settings match the analog signal type.
Perform Input Terminal Signal Test.
WARNING/ALARM 4, Mains phase loss
A phase is missing on the supply side, or the line voltage
imbalance is too high. This message also appears for a
fault in the input recti!er on the adjustable frequency
drive. Options are programmed at 14-12 Function at
Mains Imbalance.
Troubleshooting
Check the supply voltage and supply currents to the
adjustable frequency drive.
WARNING 5, DC link voltage high
The intermediate circuit voltage (DC) is higher than the
high voltage warning limit. The limit is dependent on the
adjustable frequency drive voltage rating. The adjustable
frequency drive is still active.
WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is lower than the
low voltage warning limit. The limit is dependent on the
adjustable frequency drive voltage rating. The adjustable
frequency drive is still active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
adjustable frequency drive trips after a time.
Troubleshooting
Connect a brake resistor
Extend the ramp time
Change the ramp type
Activate functions in 2-10 Brake Function
Increase 14-26 Trip Delay at Inverter Fault
WARNING/ALARM 8, DC undervoltage
If the intermediate circuit voltage (DC) drops below the
undervoltage limit, the adjustable frequency drive checks
if a 24 VDC backup supply is connected. If no 24 VDC
backup supply is connected, the adjustable frequency
drive trips after a !xed time delay. The time delay varies
with unit size.
Troubleshooting
Check that the supply voltage matches the
adjustable frequency drive voltage.
Perform Input voltage test
Perform soft charge and recti!er circuit test
WARNING/ALARM 9, Inverter overload
The adjustable frequency drive is about to cut out
because of an overload (current too high for too long).
The counter for electronic, thermal inverter protection
gives a warning at 98% and trips at 100%, while giving an
alarm. The adjustable frequency drive cannot be reset
until the counter is below 90%.
The fault is that the adjustable frequency drive has been
overloaded by more than 100% for too long.
Troubleshooting
Compare the output current shown on the LCP with the
adjustable frequency drive rated current.
Compare the output current shown on the LCP with mea-
sured motor current.