gefran VDI100 Series Instruction Manual page 204

tion time 2. Refer to the following figure 4.4.70.
Note:
The stall prevention level during run can be set by using multi-function analog input AI2 (04-05=7).
Note:
Stall prevention level in operation is set by multi-function analog input AI2 (04-05=7).
Code Parameter Name / Range
08-05 Selection for motor overload protection (OL1)
xxx0b: Motor overload is disabled
xxx1b: Motor overload is enabled
xx0xb: Cold start of motor overload
xx1xb: Hot start of motor overload
x0xxb: Standard motor
x1xxb: Special motor
0xxxb: Reserved
1xxxb: Reserved
The motor overload protection function estimates the motor overload level based on the output current, output
frequency, motor characteristics and time. The motor overload trip time depends on the motor rated current
when the output frequency is greater than 60Hz.
On inverter power-up the motor overload protection internal thermal accumulation register is automatically
reset.
To use the built-in motor overload protection function parameter 02-01 (motor rated current) has to match the
motor rated current on the motor nameplate.
Turn off the motor overload protection when using two or more motors connected to the inverter (set 08-05 =
xxx0b), and provide external overload protection for each motor (e.g. thermal overload switch).
With cold start enabled (08-05 = xx0xb), motor overload protection occurs in 5 and a half minutes when operat-
ing the motor at 150% of the motor rated current at an output frequency greater than 60Hz.
With hot start enabled (08-05 = xx1xb), motor overload protection occurs in 3 and a half minutes when operat-
ing the motor at 150% of the motor rated current at an output frequency greater than 60Hz.
Refer to the following figure 4.4.71 for an example of motor overload protection standard curve.
204
Figure 4.4.70 Stall prevention selection in operation
Load
08-03
Inverter
Output Current
Output
Frequency
t
2%
(Hysteresis)
t
T (00-15)
dec1
T (00-17)
dec2
08-22 (detection time)
t
VDI100 • Instruction manual