• Operation Selection and Setting Method
Set the analog input terminal for motor temperature input (H3-1 = E), and connect a PTC thermistor as shown in Fig 6.42. Although OH3 or OH4 will
appear on the operator when the motor overheats, the drive is defaulted to continue running when OH3 occurs, and to not output a fault. If OH4 occurs,
a fault signal will be output and the drive will come to a stop. Depending on the application, the conditions for OH3 can be set to L1-03, and the
conditions for OH4 to L1-04.
When protection operation produces abnormal amounts of noise, try increasing the value set to parameter L1-05.
n
L1-13: Continuous Electrothermal Operation Selection
Parameter Overview
No.
Name
Description
Range
Default
L1-13
Continuous Electrothermal Operation Selection
Determines whether to hold the electrothermal value when the power supply is
interrupted.
0: Disabled
1: Enabled
0 to 1
1
u
L2: Momentary Power Loss Ridethru
n
L2-01: Momentary Power Loss Operation Selection
n
L2-02: Momentary Power Loss Ridethru Time
When a momentary power loss occurs, the drive can be set to automatically return to the operation it was performing when the power went out based on
certain conditions.
No.
Name
Setting Range
Default
Page
L2-01
Momentary Power Loss Operation Selection
0 to 2
0
−
L2-02
Momentary Power Loss Ride-Thru Time
0.0 to 25.5
Determined by o2-04.
−
Detailed Description
Three operations are possible when a momentary power loss occurs. The table below lists the selections available for parameter L2-01.
Setting
Description
0
*
Disabled - Drive trips on (UV1) fault when power is lost.
1
Power Loss Ride-Thru Time: Drive will restart if power returns within the time set in L2-02.*
2
CPU Power Active: Drive will restart if power returns prior to control power supply shut down.
*Default Setting
• L2-01 = 0 (disabled)
If power is not restored within 15 ms, a UV1 alarm will result and the drive will come to stop.
• L2-01 = 1 (enabled)
When a momentary power loss occurs, the drive will attempt to restart and perform Speed Search if power is restored within the period of time set to
L2-02. If power is not restored within the time set to L2-02, then a UV1 alarm will result.
Note:
The amount of time the drive is capable of recovering after a power loss is determined by the capacity of the drive. Drive capacity determines the upper limit for L2-02. A
Momentary Power Loss Unit is available to allow for a longer momentary power loss ride through time in a 0.4 to 7.5 kW drive (200 or 400 V class). This option makes it
possible to continue running after up to 2 seconds of power loss.
• L2-01 = 2
Drive will restart as long as the CPU still has power. This allows for a longer ride-thru time than setting L2-01 to 1.
Note:
When L2-01 is set to 1 or 2, be sure that the magnetic contactor to the power supply as well as the control signal is still maintained even when the power goes out. “UV1” will
flash on the operator while the drive is attempting to recover from a momentary power loss. A fault signal is not output at this time.
n
L2-03: Momentary Power Loss Minimum Baseblock Time
Sets the minimum baseblock time when power is restored following a momentary power loss. This determines the time is takes for the leftover voltage
in the motor to dissipate. Increase this setting if overcurrent or overvoltage occur at the beginning of Speed Search. If L2-03 > L2-02, then the drive will
restart after the time set to L2-03 passes following a momentary loss in power.
No.
Name
Setting Range
Default
Page
L2-03
Momentary Power Loss Minimum Baseblock Time
0.1 to 5.0
Determined by o2-04
−
Note:
Increase this setting if overcurrent occurs at the beginning of Speed Search or DC Injection Braking.
n
L2-04: Momentary Power Loss Voltage Recovery Ramp Time
No.
Name
Setting Range
Default
Page
L2-04
Momentary Power Loss Voltage Recovery Ramp Time
0.0 to 5.0 s
Determined by o2-04
−
• Sets the time it takes for the output voltage to be restored from 0 to the maximum voltage.
n
L2-05: Undervoltage Detection Level
No.
Name
Setting Range
Default
Page
L2-05
Undervoltage Detection Level
150 to 210 V/200 V class
300 to 420 V/400 V class
190 V 380 V
*
Determined by o2-04
−
*This value is initialized when E1-01 is changed.
5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
189
5
Parameter Details