OC1 Overcurrent during acceleration:
Increase the acceleration time or adjust the torque boost level.

OC2 Overcurrent during deceleration:
Increase the deceleration time.

OC3 Overcurrent during constant-speed run:
Reduce the variance of the load conditions.

OCA Phase short circuit:
Main circuit is abnormal; repair the inverter.

OCL Load-end short circuit during start-up:
Check insulation and wiring of the main output circuit or motor.

OP1 Overvoltage during acceleration:
Check power voltage and for excessive current flow.

OP2 Overvoltage during deceleration:
Increase the deceleration time.

OP3 Overvoltage:
Check power voltage and for excessive current flow.

nOFF Undervoltage:
Input voltage is too low; check power supply and wiring.

OL1 Inverter overload trip:
Reduce the load or increase the inverter rating.
OL2 Motor overload trip:

OLr Braking resistor overload trip:
Increase the deceleration time.

OH Overheat trip:
Check ambient temperature and remove the seal if too high.

E Emergency stop:
Operation stops during automatic or remote control.

EOFF Emergency stop acceptance check:
Stop operation by pressing the STOP key twice.

EEP1 EEPROM fault:
Turn off and on the power or repair the inverter.

Etn Automatic tuning error:
Check torque up parameters.

EPH0 Output phase loss:
Check wiring between inverter and motor.

Err.1 Frequency setting signal error:
Separate the frequency setting signals.

Err.2 RAM fault:
Repair the inverter.

Err.3 ROM fault:
Repair the inverter.

Err.4 CPU fault:
Repair the inverter.

Err.5 Communication interruption error:
Check the communication device and wiring.

EtYP Inverter typeform error:
Set the mode to 6 if PCB is replaced.

C Stall prevention alarm:
Adjust acceleration time and torque level.

P Overvoltage alarm:
Increase the deceleration time.

L Overload alarm:
Reduce the load or increase inverter capacity.

HI LO Set value alarm:
Check and reset incorrect set values.

Conditions Displayed on Operation Panel:

- Frequency, 2) parameter display or changes, 3) inverter condition or error.

Keys:

- MON key: Switches between frequency, parameter, and inverter condition.
- ENT key: Stores selected item in the inverter.
- UP/DOWN key: Displays items or changes numeric values.

Display Unit:

- Shows running, inverter condition, or parameter set value.

Modes:

- Operation frequency or error contents,
- Parameter name or set value,
- Inverter condition.

Automatic Functions:

VF-S7 offers automatic acceleration/deceleration, torque boost, and environment setting. May not work for all load conditions.

Displays for Operations:

Symbols indicate LED displays and panel key operations.

+ Toshiba S7 User Manual >>

+ Toshiba S7 Fault index >>

+ Toshiba S7 Fault codes 2 >>

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