Yaskawa Z1000 AC Drive HVAC - Manual (Page 350)

Table D.6 Overload Protection Settings
Setting Description
0 Disabled Disabled the internal motor overload protection of the drive.
1 Standard fan-cooled motor (default)
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
reduced when running below the motor rated speed.
2 Drive duty motor with a speed range of 1:10
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.
3 Vector motor with a speed range of 1:100
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.
4
Permanent Magnet motor with variable
torque
Selects protection characteristics for a variable torque PM motor. The motor overload detection
level (oL1) is automatically reduced when running below the motor rated speed.
5
Permanent Magnet motor with constant
torque
Selects protection characteristics for a constant torque PM motor. The motor overload detection
level (oL1) is constant over the whole speed range.
6 Standard fan-cooled motor (50 Hz)
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
reduced when running below the motor rated speed.
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.
Enable motor overload protection (L1-01 = 1 to 6) when connecting the drive to a single motor, unless another motor overload
preventing device is installed. The drive electronic thermal overload function causes an oL1 fault, which shuts off the output
of the drive and prevents additional overheating of the motor. The motor temperature is continually calculated while the drive
is powered up.
n L1-02: Motor Overload Protection Time
Setting Range: 0.1 to 5.0 min
Factory Default: 1.0 min
Parameter L1-02 determines how long the motor is allowed to operate before the oL1 fault occurs when the drive is running
a hot motor at 60 Hz and at 150% of the full load amp rating (E2-01) of the motor. Adjusting the value of L1-02 can shift the
set of oL1 curves up the y axis of the diagram below, but will not change the shape of the curves.
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
Figure D.5 Motor Overload Protection Time
D.3 UL and CSA Standards
350 YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual