5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 187
■ L1-02: Motor Overload Protection Time
Sets the time it takes the drive to detect motor overheat due to overload. This setting rarely requires adjustment, but
should correlate with the motor overload tolerance protection time for performing a hot start.
• Defaulted to operate with an allowance of 150% overload operation for one minute.
• Figure 5.65 shows an example of the electrothermal protection operation time using a general-purpose motor
operating at 60 Hz with L1-02 set to one minute.
Figure 5.65
Figure 5.65 Motor Protection Operation Time
■ Motor Protection Using a Positive Temperature Coefficient (PTC)
A motor PTC can be connected to an analog input of the drive. This input is used by the drive for motor overheat
protection.
When the motor overheat alarm level is reached, an oH3 alarm will be triggered and the drive will continue operation as
selected in L1-03. When the overheat fault level is reached, an oH4 fault will be triggered, a fault signal will be output,
and the drive will stop the motor using the stop method determined in L1-04.
Connect the PTC between terminals AC and A1 and set jumper S4 on the terminal board to “PTC” like shown in
Figure 5.66. Set parameter H3-01 to 0 and parameter H3-02 to E.
Figure 5.66
Figure 5.66 Connection of a Motor PTC
No. Name Setting Range Default
L1-02 Motor Overload Protection Time 0.1 to 5.0 min 1.0 min
Operation time (minutes)
Cold start
Hot start
Motor current (%)
E2-01 = 100% motor current
10
7
3
1
0.4
0.1
0 100 150 200
C1
Drive
Multi-function input
PTC
thermistor
MA
Multi-function
output (contact)
Multi-function
output (photocoupler)
MB
MC
P2
P1
C2
A1 (0-10 V)
AC
PTCAI
DIP Switch S4
VI
DIP switch S1
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