B.8 L: Protection Function
L parameters provide protection to the drive and motor, including control during momentary power loss, stall prevention,
frequency detection, fault restarts, overtorque and undertorque detection, and other types of hardware protection.
u
L1: Motor Protection
No.
(Addr.
Hex)
Name LCD Display Description Values Page
L1-01
(480)
Motor Overload
Protection Selection
Mtr OL Charact
0: OL1 Disabled
1: VT Motor
4: PM Motor
0: Disabled
1: General purpose motor (standard fan cooled)
4: PM motor with variable torque control
The drive may not be able to provide protection when using
multiple motors, even if overload is enabled in L1-01. Set L1-01
to 0 and install separate thermal relays to each motor.
Default:
<1>
Range: 0, 1, 4
–
L1-02
(481)
Motor Overload
Protection Time
MOL Time Const
Sets the motor thermal overload protection (oL1) time. Default: 1.0 min
Min.: 1.0
Max.: 5.0
–
L1-03
(482)
Motor Overheat Alarm
Operation Selection
(PTC input)
Mtr OH Alarm Sel
0 : Ramp to Stop
1: Coast to Stop
2: Fast-Stop
3: Alarm only
Sets operation when the motor temperature analog input
(H3-02 or H3-10 = E) exceeds the alarm level.
0: Ramp to stop
1: Coast to stop
2: Fast Stop (decelerate to stop using the deceleration time in
C1-09)
3: Alarm only (“oH3” will flash)
Default: 3
Range: 0 to 3
–
L1-04
(483)
Motor Overheat Fault
Operation Selection
(PTC input)
Mtr OH Fault Sel
0 : Ramp to Stop
1: Coast to Stop
2: Fast-Stop
Sets stopping method when the motor temperature analog input
(H3-02, or H3-10 = E) exceeds the oH4 fault level.
0: Ramp to stop
1: Coast to stop
2: Fast Stop (decelerate to stop using the deceleration time in
C1-09)
Default: 1
Range: 0 to 2
–
L1-05
(484)
Motor Temperature
Input Filter Time (PTC
input)
Mtr Temp Filter
Adjusts the filter for the motor temperature analog input
(H3-02, or H3-10 = E).
Default: 0.20 s
Min.: 0.00
Max.: 10.00
–
L1-08
(1103)
<2>
oL1 Current Level oL1 Current Lvl
Sets the reference current for motor thermal overload detection
for the motor in amperes.
Default:
<3>
Min.: 10% of
drive rated
current
Max.: 150% of
drive rated
current
<4>
–
L1-13
(46D)
Continuous
Electrothermal
Operation Selection
Mtr OL Mem Sel
0: Disabled
1: Enabled
2: Enabled(RTC)
0: Disabled
1: Enabled
2: Enable using Real Time Clock
Default: 1
Range: 0 to 2
–
<1> Default setting is determined by parameter A1-02, Control Method Selection.
<2> Available in drive software versions PRG: 1016 and later.
<3> Default setting is determined by parameters o2-04, Drive Model Selection, and C6-01, Drive Duty Selection.
<4> The number of decimal places in the parameter value depends on the drive model. This value has two decimal places (0.01 A) if the drive is set for
a maximum applicable motor capacity up to and including 11 kW, 2A0031, 4A0021 (input voltage 460 V or higher) or 4A0027 (input voltage lower
than 460 V) and one decimal place (0.1 A) if the maximum applicable motor capacity is higher than 11 kW, 2A0046, 4A0027 (input voltage 460
V or higher) or 4A0034 (input voltage lower than 460 V) .
B.8 L: Protection Function
312
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
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