CERUS CI-007-P2, Installation, Programming Operation, & Maintenance Manual

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Chapter 8 - Troubleshooting & Maintenance
8-1
CHAPTER 8 - TROUBLESHOOTING & MAINTENANCE
8.1 Fault Display
When VFD trips on any fault, VFD turns off its output and displays the fault status in DRV-21. The last five
faults are saved in FG2-01~05 with the operation parameters and status at the trip moment.
Keypad Display
Protective
Function
Description
No Motor
No Motor
Protection VFD trips when the output current is below No Motor trip level for No Motor
time delay. Motor circuit is open or has lose connection.
Over Current 1
Over Current
Protection VFD trips when motor current exceeds 200% of VFD rated current because of
motor miss wiring or partial motor winding short.
Over Current 2 Output Short
VFD trips if internal IGBTs or motor wiring or winding are shorted. The motor
winding can have intermittent insulation break downs in VFD applications. The
Megger reading will not always show this damage.
Over Load
VFD Overload
Protection
VFD trips if the output current exceeds 120% of VFD rated current.
Inv. OLT VFD Overload
VFD trips when the output current exceeds 110% for 1 minute and 130% for 4
seconds of the rated current.
E-Thermal
Motor Electronic
Overload
Protection
The electronic motor overload protection determines the over heating of the motor
based on inverse curve. If the motor is overloaded, VFD trips. When multi-motor
array is controlled by one VFD, each motor should have individual overload
protection.
Ground Fault
Ground Fault
Protection VFD trips when ground fault current exceeds the internal ground fault level value.
VFD may trip on over current fault when ground fault current value is too high.
Over Voltage
Over voltage
protection
VFD trips if the DC Bus voltage exceeds the internal over voltage trip setting. It
can happen when regenerative energy flows back to VFD during high inertia load
deceleration, high power line voltage or power surge.
Low Voltage
Low Voltage
Protection
VFD trips if the DC bus voltage is below the internal Low voltage trip setting.
Over Heat
VFD
Over Heat VFD turns off its output if the heat sink is over heated due to insufficient cooling
(failed VFD cooling fan or dirty enclosure ventilation filter).
Ext. Trip External Trip
The VFD trips when digital input set for Ext. Trip is activated. When input is
deactivated, VFD can be reset by Stop key or by recycling the input power. Use
for Dynamic Braking overheat protection.
BX
BX stop
(Emergency Stop) The VFD trips when digital input set for BX is activated. When input is
deactivated, VFD can be reset automatically or by Stop key (selectable).
Output Phase Open Out Phase open
VFD detects the output current of all three phases and trips when one or more
output phases (U, V and W) are open.
Input Phase Open In Phase open
VFD monitors the pattern of DC bus ripples and trips when a single-phase pattern
is detected. This protection should be disabled for single-phase power input.
HW-Diag
VFD H/W
Fault Hardware diagnostic fault includes the control PCB malfunction, the EEP error,
Input phase open, NTC open and A/D Offset.
COM Error
CPU Error Communication
Error This fault is displayed when VFD cannot communicate with the keypad because
of lose keypad connector, damaged keypad or damaged control board.
NTC open NTC Open This fault is displayed when VFD internal temperature sensor is open.
LOP
LOR
LOV
LOI
LOX
Frequency
Reference is Lost
LOP: Displayed when option frequency reference is lost (DPRAM time out)
LOR:
Displayed when option frequency reference is lost (Communication
network fault)
LOV: Displayed when ‘V1’ analog frequency reference is lost.
LOI: Displayed when ‘I‘ analog frequency reference is lost.
LOX: Displayed when sub-board (V2, ENC) analog frequency reference is lost.
To reset a fault, Press
STOP/RESET key or close RST-CM terminals or cycle the input power.
If a problem persists, please contact the factory or your local distributor.