YASKAWA iQpump Micro CIMR-PW Series

Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start after continuous operation
at 100%.
Figure 5.67 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.
Motor overload protection operates in the area between a cold start and a hot start.
• Cold start: Characteristics of motor protection operation time in response to an overload situation that was suddenly reached
when starting a stationary motor.
• Hot start: Characteristics of motor protection operation time in response to an overload situation that occurred while the
motor was operating continuously at or below its rated current.
Operation time (minutes)
Cold start
(characteristics when an
overload occurs at a
complete stop)
Hot start
(characteristics when an
overload occurs during
continuous operation at 100%)
Motor current (%)
E2-01 = 100% motor current
10
7
3
1
0.4
0.1
0 100 150 200
Figure 5.67 Protection Operation Time for General Purpose Motors at the Rated Output Frequency
n
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 is triggered, a fault signal will be output and the drive
will stop the motor using the stop method determined in L1-04.
Figure 5.68 shows a PTC connection example for analog input A2. If using analog input A2, make sure to set DIP switch S1
on the terminal board for voltage input when using this function.
Drive
+V
(+10.5V, 20 mA)
Multi-function input
Branch
resistor
12 k
PTC
thermistor
MA
Multi-function
output (contact)
Multi-function
output (photocoupler)
MB
MC
P1
P2
PC
A2 (0-10 V)
AC
Figure 5.68 Connection of a Motor PTC
The PTC must have the following characteristics for one motor phase. Normally a motor is protected by three PTCs connected
in series.
5.8 L: Protection Functions
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
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Parameter Details