Drive Motor Overload Protection - YASKAWA A1000 Series Technical Manual

D.3 UL Standards
<1> Use the specified crimp terminals (Model 14.NK4) when using CIMR-A 2A0030, 2A0040, 4A0018, and 4A0023 with 14 mm
Note: Use crimp insulated terminals or insulated shrink tubing for wiring connections. Wires should have a continuous maximum
allowable temperature of 75°C 600 Vac UL-approved vinyl-sheathed insulation.
Input Fuse Installation
Always install fuses at the drive input side. Refer to
Low Voltage Wiring for Control Circuit Terminals
■
Wire low voltage wires with NEC Class 1 circuit conductors. Refer to national state or local codes for wiring. Use a class
2 (UL listed) power supply for the control circuit terminal when not using the drives internal control power supply.
Input / Output
Multi-function digital inputs
Multi-function analog inputs
Pulse train input
Pulse train output
Safe disable inputs
Safe disable outputs
Drive Short-Circuit Rating
■
This drive has undergone the UL short-circuit test, which certifies that during a short circuit in the power supply, the
current flow will not rise above 100,000 amps at 240 V for 200 V class drives and 480 V for 400 V class drives.
• The MCCB, breaker protection, and fuse ratings shall be equal to or greater than the short-circuit tolerance of the
power supply being used.
• Suitable for use on a circuit capable of delivering not more than 100,000 RMS symmetrical amperes for 240 V in 200
V class drives (up to 480 V for 400 V class drives) motor overload protection.

◆ Drive Motor Overload Protection

Set parameter E2-01 (motor rated current) to the appropriate value to enable motor overload protection. The internal
motor overload protection is UL listed and in accordance with the NEC and CEC.
E2-01 Motor Rated Current
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Setting Range: Model Dependent
Default Setting: Model Dependent
Parameter E2-01 (motor rated current) protects the motor if parameter L1-01 is not set to 0 (default is 1, enabling
protection for standard induction motors).
If Auto-Tuning has been performed successfully, the motor data entered to T1-04 is automatically written into parameter
E2-01. If Auto-Tuning has not been performed, manually enter the correct motor rated current to parameter E2-01.
L1-01 Motor Overload Protection Selection
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The drive has an electronic overload protection function (oL1) based on time, output current, and output frequency,
which protects the motor from overheating. The electronic thermal overload function is UL-recognized, so it does not
require an external thermal relay for single motor operation.
This parameter selects the motor overload curve used according to the type of motor applied.
Setting
0 Disabled
1 Standard fan cooled motor (default)
2 Drive duty motor with a speed range of 1:10
3 Vector motor with a speed range of 1:100
516
Installing Input Fuses on page 385
Table D.4 Control Circuit Terminal Power Supply
Terminal Signal
S1, S2, S3, S4, S5, S6, S7, S8, SC
+V, –V, A1, A2, A3, AC
RP, AC
MP, AC
H1, H2, HC
DM+, DM-
Table D.5 Overload Protection Settings
Disabled the drive's internal motor overload protection.
Selects protection characteristics for a standard self cooled motor with limited cooling capabilities when running below
the rated speed. The motor overload detection level (oL1) is automatically reduces when running below the motor rated
speed.
Selects protection characteristics for a motor with self-cooling capability within a speed range of 10:1. The motor
overload detection level (oL1) is automatically reduced when running below 1/10 of the motor rated speed.
Selects protection characteristics for a motor capable of cooling itself at any speed — including zero speed (externally
cooled motor). The motor overload detection level (oL1) is constant over the entire speed range.
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Use the internal control power supply of the drive or an external class 2
power supply.
Requires class 2 power supply
Description
(6 AWG).
2
for selecting fuses.
Power Supply Specifications