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5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
299
5
Figure 5.88
Figure 5.88 Protection Operation Time for General Purpose Motors at the Rated Output Frequency
■
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 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 stop method determined in L1-04.
CIMR-UA
, CIMR-UD
, CIMR-UT
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.
Figure 5.89
Figure 5.89 Connection of a Motor PTC
CIMR-UB
Connect the PTC between terminals AC and A3 and set jumper S4 on the terminal board to “PTC” like shown in
. Set parameter H3-05 to 0 and parameter H3-06 to E.
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
Drive
+V
(+10.5V, 20 mA)
Branch
resistor
12 k
PTC
thermistor
A2 (0-10 V)
AC
DIP switch S1
V
I
SIEP_C710636_02B_1_0.book 299 ページ 2015年11月25日 水曜日 午後4時56分