YASKAWA U1000 - Page 77

Thermal
relay
motor
Power supply
M1
oL1
oL2
M2
Drive
(external fault)
N.O. input
oL1
oL2
SC
S3
Figure i.66 Example of Protection Circuit Design for Multiple Motors
NOTICE: Thermal protection
cannot be provided when running multi-motors simultaneously with the same drive, or when using motors with
a relatively high current rating compared to other standard motors (such as a submersible motor). Failure to comply could result in motor
damage. Disable the electronic overload protection of the drive (L1-01 = “0: Disabled”) and protect each motor with individual motor thermal
overloads.
Setting 1: General-purpose Motor (Standard Self-cooled)
Because the motor is self-cooled, the overload tolerance drops when the motor speed is lowered. The drive appropriately
adjusts the electrothermal trigger point according to the motor overload characteristics, protecting the motor from overheat
throughout the entire speed range.
Overload Tolerance Cooling Ability Overload Characteristics
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
05 33 100 120 167 200
Speed (%)
Continuous
A
B
C
Rated Speed=100% Speed
60 s
150
100
90
60
50
Torque (%)
Motor designed to operate from line
power.
Motor cooling is most effective when
running at
rated base frequency (check
the motor nameplate or specifications).
Continuous operation at less than line
power frequency with 100% load can
trigger a motor overload fault (oL1). A
fault is output and the motor will coast
to stop.
Setting 2: Drive Dedicated Motor (Speed Range for Constant Torque: 1:10)
Use this setting when operating a drive duty motor that allows constant torque in a speed range of 1:10. The drive will allow
the motor to run with 100% load from 10% up to 100% speed. Running the motor below 10% speed with 100% load will
trigger an overload fault.
Overload Tolerance Cooling Ability Overload Characteristics
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
Rated Speed=100% Speed
60 s
Continuous
A
B
C
Speed (%)
Torque (%)
100
150
1
10
100120
167 200
55
50
0
Motor is designed to effectively cool
itself even at low speeds.
Continuous operation with 100% load
from 6 Hz to E1-06, Motor Base
Frequency.
Setting 3: Vector Motor (Speed Range for Constant Torque: 1:100)
Use this
setting when operating a drive-dedicated motor that allows constant torque in a speed range of 1:100. This motor type
is allowed to run with 100% load from 1% up to 100% speed. Running the motor below 1% speed with 100% load will trigger
an overload fault.
i.5 Start-Up Programming and Operation
YASKAWA ELECTRIC TOEP C710636 04D U1000 Industrial MATRIX Drive Quick Start Guide
77