YASKAWA Z1000U Series Quick Start Manual page 59

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.
Note: Close MC1 and MC2 before operating the drive. MC1 and MC2 cannot be switched off during run.
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
150
Rated Speed=100% Speed
60 s
A: Max. speed for 200LJ and above
B: Max. speed for 160MJ to 180 LJ
C: Max. speed for 132MJ and below
100
90
60
Continuous
50
A
B
05 33 100 120 167 200
Speed (%)
Setting 4: PM Derated Torque Motor
Use this setting when operating a PM motor. PM motors for derated torque have a self-cooling design and the overload tolerance
drops as the motor slows. Electronic thermal overload is triggered in accordance with the motor overload characteristics,
providing overheat protection across the entire speed range.
Overload Tolerance
150
120
100
80
50
0.0
10
Motor Speed (%)
n L1-02: Motor Overload Protection Time
Sets the time for the drive to shut down on motor overload (oL1) when the motor is running with excessive current. Enter the
time the motor can withstand operating at 150% current after previously running at 100% current (hot motor overload
condition). There is normally no need to change this parameter from the default value.
No.
L1-02
Defaulted to operate with an allowance of 150% overload operation for one minute in a hot start after continuous operation
at 100%.
Figure i.54 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.
YASKAWA ELECTRIC TOEP C710636 11E Z1000U HVAC MATRIX Drive Quick Start Guide
Power supply
Figure i.53 Example of Protection Circuit Design for Multiple Motors
C
60 s
Continuous
33 100
Name
Motor Overload Protection Time
Drive oL1
S3
oL2
(external fault)
oL1 N.O. input
Thermal
oL2
relay
SN
SC
SP
Cooling Ability
Motor designed to operate from line
power.
Motor cooling is most effective when
running at rated base frequency (check
the motor nameplate or specifications).
Cooling Ability
Motor is designed to produce 100%
torque at base speed. Built with
effective cooling capabilities.
i.5 Start-Up Programming and Operation
motor
M1
M2
Overload Characteristics
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.
Overload Characteristics
Reaching 100% when operating at
below the base frequency causes a
motor overload fault (oL1). The drive
fault output closes and the motor coasts
to stop.
Setting Range
0.1 to 5.0 minutes
Default
1.0 minutes
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