Drive Motor Overload Protection - YASKAWA T1000A Technical Manual

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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 power supply for the control circuit terminal when not using the internal control power supply of the drive. Refer to
NEC Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power Limited Circuits for requirements
concerning class 1 circuit conductors and class 2 power supplies.
Input / Output
Open Collector Outputs
Digital inputs
Analog inputs / outputs
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Drive Short-Circuit Rating
This drive is suitable for use on a circuit capable of delivering not more than 100,000 RMS symmetrical amperes, 600 V
ac maximum (Up to 240 V in 200 V class drives, up to 480 V for 400 V class drives), when protected by Bussmann Type
FWH fuses as specified in
u 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.
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E2-01 Motor Rated Current
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.
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L1-01 Motor Overload Protection Selection
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
4 Permanent Magnet motor with variable torque
5 Permanent Magnet motor with constant torque
6 Standard fan cooled motor (50 Hz)
When connecting the drive to more than one motor for simultaneous operation, disable the electronic overload protection
(L1-01 = 0) and wire each motor with its own motor thermal overload relay.
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Table D.7 Control Circuit Terminal Power Supply
Terminal Signal
DM+, DM-
S1-S8, SN, SC, SP, HC, H1, H2
+V, -V, A1, A2, A3, AC, AM, FM
Table D.6.
Table D.8 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.
Selects protection characteristics for a variable torque PM motor. The motor overload detection level (oL1) is
automatically reduces when running below the motor rated speed.
Selects protection characteristics for a constant torque PM motor. The motor overload detection level (oL1) is constant
over the whole speed range.
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.
Power Supply Specifications
Requires class 2 power supply.
Use the internal LVLC power supply of the drive. Use class 2 for external power supply.
Use the internal LVLC power supply of the drive. Use class 2 for external power supply.
Description
D.3 UL Standards
D
487