gefran VDI100 Series Instruction Manual page 358

- Inverter Motor Overload Protection
Set parameter 02-0 I (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.
■ 02-01 Motor Rated Current
Setting Range Model Dependent
Factory Default: Model Dependent
The motor rated current parameter (02-0) protects the motor and allows for proper vector control when using
open loop vector or flux vector control methods (00-00 = 2 or 3). The motor protection parameter 08-05 is set
as factory default. Set 02-01 to the full load amps (FLA) stamped on the nameplate of the motor. The operator
must enter the rated current of the motor (17-02) in the menu during auto-tuning. If the auto-tuning operation
completes successfully (17-00 = 0), the value entered into 17-02 will automatically write into 02-0 I.
■ 08-05 Motor Overload Protection Selection
The inverter has an electronic overload protection function (OL1) based on time, output current, and output fre-
quency, which protects the motor from overheating. The electronic thermal overload function is UL-recognized,
so it does not require an external thermal overload relay for single motor operation.
This parameter selects the motor overload curve used according to the type of motor applied.
Code Parameter Name / Range
08-05 Selection for motor overload protection (OL1)
xxx0b: Motor overload is invalid
xxx1b: Motor overload is valid
xx0xb: Cold start of motor overload
xx1xb: Hot start of motor overload
x0xxb: Standard motor
x1xxb: Special motor
0xxxb: Reserved
1xxxb: Reserved
Sets the motor overload protection function in 08-05 according to the applicable motor.
08-05 = ---OB: Disables the motor overload protection function when two or more motors are connected to a
single inverter. Use an alternative method to provide separate overload protection for each motor such as con-
necting a thermal overload relay to 1he power line of each motor.
08-05 = --1-B: The motor overload protection function should be set to hot start protection characteristic curve
when the power supply is turned on and off frequently, because the thermal values are reset each time when
the power is turned off.
08-05 = -0—B: For motors without a forced cooling fan (general purpose standard motor), the heat dissipation
capability is lower when in low speed operation.
08-05 = -1—B: For motors with a forced cooling fan (inverter duty or VIF motor), the heat dissipation capability
is not dependent upon the rotating speed.
To protect the motor from overload by using electronic overload protection, be sure to set parameter 02-01
according to the rated current value shown on the motor nameplate.
Refer to the following "Motor Overload Protection Time" for the standard motor overload protection curve exam-
ple: Setting 08-05 = -0--B.
Low Speed
(<60 Hz)
5.5
3.0
3.5
1.0
100%
358
High Speed
(>60 Hz)
Cold Start
Hot Start
Motor Load Current (%)
(02-01 = 100%)
150% 200%
VDI100 • Instruction manual