6
31
5.1.2 Tripping after power on or during operation
•
Check whether there is grounding or short circuit between the input power
supplies.
•
Check whether a leakage protector is installed at the input.
•
Check whether there is interphase short circuit between output modules. If so,
please contact Dayliff for help.
•
Check whether there is grounding or short circuit between motor leads. If tripping
occurs occasionally and the distance between the pump and the inverter is
relatively long, please consider installing an output AC reactor.
5.1.3 The pump does not work while the inverter is operating
•
Check whether there is a balanced three-phase output between phase U, V and W.
If so, the motor or its cables may be damaged, or the pump motor is locked-rotor
due to mechanical reasons.
•
Check whether there is no voltage output. If so, the driving board or output
module may be damaged. Please contact Dayliff for help.
5.1.4 The inverter displays fault code and cannot operate
•
If a fault occurs during the use, please check the fault code in parameters
F07.27~F07.32 and find solutions according to Table 5-1 Fault Code
Description or contact a Dayliff retailer.
Fault Type
Possible Causes
Solutions
Fault
Code
Overcurrent
when
Accelerating
1. Acceleration or deceleration
is too fast
2. Input voltage is too low
3. Inverter rated power is too
low
4. Pump load is abnormal
5. Cables are abnormal
1. Increase acceleration or deceleration
time
2. Check the input power supply
3. Choose a power matching inverter
4. Check whether the pump motor is
locked-rotor, whether the pump motor
three-phase resistance is unbalanced,
and whether the motor phase cables are
not insulated from the ground
5. Check whether the output cables are
correctly connected and well insulated
OC1
Overcurrent
when
Decelerating
OC2
Overcurrent
when Operating
in Constant
Speed
OC3
Overvoltage
when
Accelerating
OU1
Overvoltage
when
Decelerating
OU2
Over voltage
when Operating
in Constant
Speed
OU3
1. Input voltage is abnormal
2. Pump load is too heavy
1. Check the input power supply
2. Increase acceleration or deceleration
t i m e , o r i n s t a l l p r o p e r b r a k i n g
resistance/unit
DC Bus
Undervoltage
UV
Input voltage is too low
Check the input power supply
