86
SANTERNO
USER MANUAL
8.3.2 VFD normal faults and solutions
● Transformer overheat alarm:
When the transformer temperature is greater than the set alarm temperature (the default setting is 100
℃
), the
temperature controller will close the over-temperature alarm contact. When light fault alarm, the interface board
transformer over-temperature alarm contact
1. Please check whether the cabinet top fans and transformer bottom fans work normally (If work abnormally
maybe cause greater temperature phase difference among three phases);
2. Whether the temperature resistance is normal (check connections, check plugs connections, if connections are
not good, temperature will be higher); Whether the filter is plugged(put an A4 paper on the filter to see whether it
can be adsorbed);
3.Whether the VFD works under long-term overload state;
4. Whether the ambient temperature is too high (the ambient temperature should be below 45
℃
, otherwise, it
needs to improve ventilation);
5.Whether the front bottom fans switch installed in transformer cabinet and contactor are disconnected.
6.Whether the transformer control fans and protection circuit are normal.
No.
Item
Key points
1
VFD& accessory
equipment
switch cabinet
Whether the primary wire power L1, L2, L3 of the switch
cabinet is normal?
Whether the circuit-breaker is switched on?
bypass cabinet
Whether there is indicator on electric monitor?
Whether the vacuum contactor is switched on?
primary income
Whether the wiring from the switch cabinet to the by-pass
cabinet is correct?
Whether the wiring from the by-pass cabinet to VFD is correct?
interlock wiring &control
power
Whether bypass cabinet control loop power supply is normal?
Whether switch on permitted/ MV switch off interlock wiring is
correct?
VFD
Whether the primary wiring from transformer cabinet to cell
cabinet is correct?
Whether VFD parameters set correctly?
Whether VFD status displays MV not ready?
Whether fault indicator is always on? Whether there is heavy
fault?
2
load equipment
primary wiring
Whether wiring from VFD to motor is correct?
motor
Whether the motor is blocked?
Whether runs normally at rated frequency?
load
Whether the fans are normal?
3
file record
site installation file
Whether check as per steps?
