YASKAWA CIMR-ZU A Series Programming Manual page 102

1 8 L Protection Functions
Ma imum Load Current
150
120
100
80
50
0.0
10
Motor Speed (%)
L1 2 Motor O erload Protection ime
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.
illustrates an example of the electrothermal protection operation time using a general-purpose motor operating at
Figure 1.58
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.
Motor Protection Usin a Positi e emperature Coe icient (P C)
Connect a motor PTC to an analog input of the drive for motor overheat protection.
When the PTC input signal reaches the motor overheat alarm level, an oH3 alarm will be triggered and the drive will continue
operation as selected in L1-03. When the PTC input signal reaches the overheat fault level, an oH4 fault will be triggered, a
fault signal will be output, and the drive will stop the motor using the stopping method determined in L1-04.
shows a PTC connection example for analog input A2. When using analog input A2, be sure to set Jumper S1 on
Figure 1.59
the control board for voltage input when using this function.
1 2
60 s
Continuous
33 100
Name
Motor Overload Protection Time
Operation time (minutes)
10
7
3
1
0.4
0.1
0 100
Fi ure 1 8 Motor Protection Operation ime
Coolin Ability
Motor is designed to produce 100%
torque at base speed. Built with
effective cooling capabilities.
Motor current (%)
150 200
E2-01 = 100% motor current
O erload C aracteristics
Reaching 100% when operating at
below the base frequency causes a
motor overload fault (oL1). The drive
fault output closes and the motor coasts
to stop.
Settin an e
0.1 to 50.0 minutes
Cold start
Hot start
ermistor
De ault
1.0 minute