YASKAWA Z1000U Technical Manual page 151

n L1-02: Motor Overload Protection Time
Sets the detection time of motor overheat due to overload. This setting rarely requires adjustment, but should correlate with
the motor maximum load current protection time for performing a hot start.
No.
L1-02
Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start.
Figure 5.40 illustrates an example of the electrothermal protection operation time using a general-purpose motor operating at
the value of E1-06, Motor Base Speed, with L1-02 set to one minute.
During normal operation, motor overload protection operates in the area between a cold start and a hot start.
• Cold start: Motor protection operation time in response to an overload situation that was suddenly reached when starting a
stationary motor.
• Hot start: Motor protection operation time in response to an overload situation that occurred during sustained operation at
rated current.
u
L2: Momentary Power Loss Ride-Thru
n L2-01: Momentary Power Loss Operation Selection
When a momentary power loss occurs (DC bus voltage falls below the level set in L2-05), the drive can automatically return
to the operation it was performing prior to the power loss based on certain conditions.
No.
L2-01
Setting 0: Disabled
If power is not restored within 15 ms, a Uv1 fault will result and the motor coasts to stop.
Setting 1: Recover within L2-02
When a momentary power loss occurs, the drive output will be shut off. If the power returns within the time set to parameter
L2-02, the drive will perform Speed Search and attempt to resume operation. If the power does not return within this time, it
will trigger a Uv1 fault.
Note: L2-02 value is dependent on drive model selection and is not accessible.
Setting 2: Recover as long as CPU Has Power
When a momentary power loss occurs, the drive output will be shut off. If the power returns and the drive control circuit has
power, the drive will attempt to perform Speed Search and resume the operation. This will not trigger a Uv1 fault.
Notes on Settings 1 and 2
"Uv" 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.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Name
Motor Overload Protection Time
Operation time (minutes)
10
7
3
1
0.4
0.1
0 100
Figure 5.40 Motor Protection Operation Time
Name
Momentary Power Loss Operation Selection
Setting Range
0.1 to 50.0 minutes
Cold start
Hot start
Motor current (%)
150 200
E2-01 = 100% motor current
Setting Range
5.8 L: Protection Functions
Default
1.0 minute
Default
0 to 2 2
5
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