YASKAWA T1000V Technical Manual page 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.
No.
L1-02
• 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
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
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Name
Motor Overload Protection Time
Operation time (minutes)
10
7
3
1
0.4
0.1
0 100
Figure 5.65 Motor Protection Operation Time
Multi-function input
DIP Switch S4
AI
A1 (0-10 V)
PTC
thermistor
AC
Figure 5.66 Connection of a Motor PTC
Setting Range
Cold start
Hot start
Motor current (%)
150 200
E2-01 = 100% m o t o r c u r r e n t
Drive
DIP switch S1
V I
MA
Multi-function
PTC
MB
output (contact)
MC
P1
C1
P2 Multi-function
output (photocoupler)
C2
5.8 L: Protection Functions
Default
0.1 to 5.0 min 1.0 min
5
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