DAYLIFF SUNVERTER B Installation & Operating Manual page 34

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
Fault Type
Code
Overcurrent
when
OC1
Accelerating
Overcurrent
when
OC2
Decelerating
Overcurrent
when Operating
OC3
in Constant
Speed
Overvoltage
when
OU1
Accelerating
Overvoltage
when
OU2
Decelerating
Over voltage
when Operating
OU3
in Constant
Speed
DC Bus
UV
Undervoltage
Possible Causes
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. Input voltage is abnormal
2. Pump load is too heavy
Input voltage is too low
6 31
Solutions
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
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
Check the input power supply