3.3 - FREQUENCY INVERTER
Schematics & Parts mySelective.com
CHAPTER 3 3
3.3 FREQUENCY INVERTER
Alarms and Corrective Actions frequency inverter
TABLE 3.2 TROUBLESHOOTING FREQUENCY INVERTER
: ON : BLINKING : OFF
ALARM DISPLAY
INVERTER
STATUS
EXPLANATION CAUSES AND
CORRECTIVE ACTIONS
DIGITAL
OPERATOR
RUN
(GREEN)
ALARM
(RED)
Warning
Does not
output fault.
Auto-
matically
recover
after the
fault
eliminated
UV (Main circuit low voltage)
Main circuit DC voltage drops below the
low-voltage detection level while the
inverter output is OFF. Detection level
200V class: Approx 200V or less (for
single-phase, approx 160V or less)
400 class: Approx. 400V or less
Control power fault: Control power fault
detected while inverter stopped
Check the following:
• Power supply voltage
• Main circuit power supply wiring is
connected
• Terminal screws are securely
tightened
OV (Main circuit overvoltage)
Main circuit DC voltage exceeds the
overvoltage detection level while the
inverter output is OFF. Detection level
200V class: Approx. 410V or more
400V class: Approx. 820V or more
Check the power supply voltage
OH (Cooling fin overheat)
Intake air temperature rises while the
inverter is stopped
Check the intake air temperature
CAL (MEMOBUS in waiting)
After power ON with n003 (operation
mode selection) set to 2 and n004
(frequency reference selection) to 6,
normal transmission data is not received
from PLC
Check communication devices and
transmission signals
OPE (Constant setting error when
setting constants from MEMOBUS)
OP1: Same set values are input to
constants n050 to n056 for multi-function
input selection
OP2: Improper size comparison of setting
for V/f constants n011, n013, n014 and
n016
OP3: Set value of motor rated current
(n036) exceeds 150% of inverter rating
OP4: Frequency reference upper limit
(n033)< Frequency reference lower limit
(n034)
OP5: Improper size comparison among
jump Frequency 1 (n083), 2 (n084) and
3(n085)
OP9: Carrier Frequency (n080) setting
error
Check set value
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