LS Electric S100 Drive Fault Codes:
| Fault Code and Meaning | Cause and Remedy |
|---|---|
| OLt Over Load (Latch) | Cause: Displayed when the motor overload trip is activated and the actual load level exceeds the set level. Remedy: Check motor load and capacity. Operates when Pr.20 is set to a value other than 0. |
| ULt Under Load (Latch) | Cause: Displayed when the motor underload trip is activated and the actual load level is less than the set level. Remedy: Check for broken belts or pump dry run. Operates when Pr.27 is set to a value other than 0. |
| OCt Over Current1 (Latch) | Cause: Displayed when inverter output current exceeds 200% of the rated current. Remedy: Check for short circuits or motor insulation failure. |
| OVt Over Voltage (Latch) | Cause: Displayed when internal DC circuit voltage exceeds the specified value. Remedy: Check input voltage and deceleration time. |
| LVt Low Voltage (Level) | Cause: Displayed when internal DC circuit voltage is less than the specified value. Remedy: Check input power supply voltage. |
| LV2 Low Voltage2 (Latch) | Cause: Displayed when internal DC circuit voltage is less than the specified value during inverter operation. Remedy: Check for power fluctuations during operation. |
| GFt Ground Trip (Latch) | Cause: Displayed when a ground fault trip occurs on the output side of the inverter and causes the current to exceed the specified value. Remedy: Check motor and cabling for ground faults. (Note: S100 inverters 4.0kW or less do not support GFT; they may show OCT or OVT instead). |
| EtH E-Thermal (Latch) | Cause: Displayed based on inverse time-limit thermal characteristics to prevent motor overheating. Remedy: Check motor load and cooling. Operates when Pr.40 is set to a value other than 0. |
| POt Out Phase Open (Latch) | Cause: Displayed when a 3-phase inverter output has one or more phases in an open circuit condition. Remedy: Check output wiring. Operates when bit 1 of Pr.05 is set to 1. |
| IPO In Phase Open (Latch) | Cause: Displayed when a 3-phase inverter input has one or more phases in an open circuit condition. Remedy: Check input wiring and fuses. Operates only when bit 2 of Pr.05 is set to 1. |
| IOL Inverter OLT (Latch) | Cause: Displayed when the inverter has been protected from overload and resultant overheating (150% for 1 min, 200% for 4 sec). Remedy: Check load duty cycle and inverter capacity. |
| ntH No Motor Trip (Latch) | Cause: Displayed when the motor is not connected during inverter operation. Remedy: Check motor connection. Operates when Pr.31 is set to 1. |
| OHt Over Heat (Latch) | Cause: Displayed when the temperature of the inverter heat sink exceeds the specified value. Remedy: Check cooling fan and ambient temperature. |
| OC2 Over Current2 (Latch) | Cause: Displayed when the DC circuit in the inverter detects a specified level of excessive, short circuit current. Remedy: Check for short circuit in the motor or internal DC circuit issues. |
| EHt External Trip (Latch) | Cause: Displayed when an external fault signal is provided by the multi-function terminal. Remedy: Check external device status. Requires multi-function input terminals at In.65-71 set to 4. |
| bX BX (Level) | Cause: Displayed when the inverter output is blocked by a signal provided from the multi-function terminal. Remedy: Check input signal status. Requires multi-function input terminals at In.65-71 set to 5. |
| HWt H/W-Diag (Fatal) | Cause: Displayed when an error is detected in memory (EEPROM), ADC Offset, or CPU watchdog. Remedy: Fatal Error. Power cycle the unit. If error persists, contact LS ELECTRIC customer service. |
| ntC NTC Open (Latch) | Cause: Displayed when an error is detected in the temperature sensor of the Insulated Gate Bipolar Transistor (IGBT). Remedy: Contact service center. |
| FAn Fan Trip (Latch) | Cause: Displayed when an error is detected in the cooling fan. Remedy: Check or replace cooling fan. (Set Pr.79 to 0 to activate fan trip for models below 22kW). |
| PId Pre-PID Fail (Latch) | Cause: PID feedback is below set value and low feedback continues (treated as load fault). Remedy: Check PID feedback loop and system pressure/flow. Operates with functions set at AP.34–AP.36. |
| Hbr Ext-Brake (Latch) | Cause: Occurs when the inverter output starting current remains below the set value at Ad.41. Remedy: Check external brake settings. Set either OU.31 or OU.32 to 35 (BR Control). |
| SFA / SFb Safety A(B) Err (Latch) | Cause: Displayed when at least one of the two safety input signals is off. Remedy: Check safety input wiring and switches. |
| PtCt PTC Trip (Latch) | Cause: Displayed when a PTC error is detected, PTC value is exceeded, or a fault occurs. Remedy: Check motor PTC sensor and wiring. |
| LOr Lost Command (Level) | Cause: Frequency or operation command error detected during remote operation (not keypad). Remedy: Check communication lines. Activate by setting Pr.12 to any value other than 0. |
| IOt IO Board Trip (Latch) | Cause: I/O board or external communication card is not connected or has a bad connection. Remedy: Check connection of the option card. |
| ErrC Error Code | Cause: Displayed when an error code continues for more than 5 seconds. Remedy: Check specific error sequence displayed. |
| PAr ParaWrite Trip (Latch) | Cause: Communication fails during parameter writing (LCD keypad usage). Remedy: Check control cable connection between keypad and inverter. |
| OPt Option Trip-1 (Latch) | Cause: Communication error detected between the inverter and the communication board. Remedy: Check installation of communication option card. |
| OLW Over Load Warning | Cause: Displayed when the motor is overloaded. Remedy: Operates when Pr.17 is set to 1. Output available via terminal (OU.31/OU.33 set to 5). |
| ULW Under Load Warning | Cause: Displayed when the motor is underloaded. Remedy: Operates when Pr.25 is set to 1. Output available via terminal (OU.31/OU.33 set to 7). |
| IOLW INV Over Load Warning | Cause: Displayed when overload time equivalent to 60% of inverter overheat protection level is accumulated. Remedy: Reduce load. Output available via terminal (OU.31/OU.33 set to 6). |
| LCW Lost Command Warning | Cause: Lost command warning alarm occurs based on condition set at Pr.13-15. Remedy: Check comms. Even if Pr.12 is 0, this warning can occur via digital output (OU.31/OU.33 set to 13). |
| FAnW Fan Warning | Cause: Displayed when an error is detected from the cooling fan while Pr.79 is set to 1. Remedy: Check fan. Warning signal available via digital output (OU.31/OU.33 set to 8). |
| EFAn Fan Exchange | Cause: Alarm occurs when the fan life value (Pr.86) is less than the value set at Pr.87. Remedy: Replace fan. Warning signal available via digital output (OU.31/OU.33 set to 37). |
| dbW DB Warn %ED | Cause: Displayed when the DB resistor usage rate exceeds the set value. Remedy: Check DB resistor sizing. Set detection level at Pr.66. |
| trEr Retry Tr Tune | Cause: Tr tune error warning alarm is activated when motor’s rotor time constant (Tr) is too low or high. Remedy: Check motor parameters. Activated when dr.9 is set to 4. |
| SLP PID Sleep | Cause: When the PID operation enters sleep mode, a warning occurs. Remedy: Normal operation status during PID sleep. |