Note: Reduce this setting in order to allow for a large change in frequency as determined by the torque limit when using integral control with the torque limit.

L7-07: Torque Limit Control Method Selection during Accel/Decel

Selects the method of torque limit controls during acceleration and deceleration.

No.

L7-07

Torque Limit Control Method Selection during Accel/Decel

Note: This setting rarely needs to be changed. Set this parameter to 1 (Integral Control) to give torque control priority when accelerating in applications using the torque limit feature.

Be aware that when the torque limit is triggered, the acceleration time may increase and motor speed may differ slightly more than usual from the exact frequency reference.

L8: Hardware Protection

L8-01: Internal Dynamic Braking Resistor Protection Selection (ERF type)

This parameter selects the dynamic braking resistor protection only when using the 3% duty cycle heatsink mount Yaskawa braking resistor. This parameter

does not enable or disable the general dynamic braking function of the Drive. Do not adjust this parameter when using any other braking resistors.

L8-02: Overheat Alarm Level

L8-03: Overheat Pre-Alarm Operation Selection

The drive is capable of warning the operator of an impending heatsink over-temperature fault via an OH pre-alarm. The level at which the pre-alarm will

activate is determined by the setting of parameter L8-02. Measurement of the heatsink temperature is done with several strategically mounted thermistors.

The drive will fault (OH2) if any of the heatsink thermistors measure a temperature in excess of the setting of L8-02. When an OH2 fault occurs, one of

the action below can be set to L8-03:

• Ramp to stop at the selected deceleration time (L8-03 = 0)

• Coast to stop (L8-03 = 1)

• Fast Stop (L8-03 = 2: Fast Stop)

• Continue operating but display an OH alarm (L8-03 = 3: Alarm only)

• Continue operating but derate the frequency reference (L8-03 = 4: Derated Operation)

When an output terminal is set to for the OH prealarm (H2-01 = 20), the switch will close when the heatsink temperature rises above L8-02, regardless

of the value set to L8-03.

L8-05: Input Phase Loss Protection Selection

Selects the detection of input current phase loss, power supply voltage imbalance, or main circuit electrostatic capacitor deterioration.

Phase loss detection for the input power supply is disabled when:

• a stop command has been issued

• the magnetic contactor has interrupted the power supply

• a CPU A/D conversion fault occurs

• the drive is decelerating

• output current is less than or equal to 30% of the drive rated current

L8-07: Output Phase Loss Protection

The output phase loss detection circuit monitors the DCCT and is triggered when one or more of the output phases are lost. If an output phase loss (LF)

fault occurs, and the motor coasts to stop.

L8-09: Output Ground Fault Detection Selection

Enables and disables the drive's output ground fault detection. Drive coasts to stop when a ground fault is detected.

L8-10: Heatsink Cooling Fan Operation Selection

L8-11: Heatsink Cooling Fan Operation Delay Time

Parameters L8-10 and L8-11 allow the drive programmer to customize the heatsink cooling fan operation. Parameter L8-10 determines whether the cooling

fans are always on whenever the drive is powered (L8-10 = "1: Fan Always On") or if the cooling fans are only on when the drive is in a run condition

(L8-10 = "0: Fan On-Run Mode").

Parameter L8-11 is a delayed off for the cooling fan if L8-10 = "0: Fan On-Run Mode". When the cooling fans are set to turn off when the run command

is removed, parameter L8-11 will cause the fans to continue cooling the drive for the amount of time programmed into L8-11 after the run command is

actually removed. The drive can be programmed to allow the cooling fan to run for up to 5 minutes (factory default) after the run command is removed.

Both parameters are intended to extend fan life while still providing sufficient cooling for proper drive operation.