79
4. Parameter description
Parameter
Example 8: In this example, the use of negative slope is shown. Negative slopes are used in
applications for control of pressure, temperature or flow. The sensor that is connected
to the input generates a large signal (10V) at high pressure or flow. With negative slope
settings, the AC motor drive will slow stop the motor. With these settings the AC motor
drive will always run in only one direction (reverse). This can only be changed by
exchanging 2 wires to the motor.
10V
0V
60Hz
0Hz
Negative slope
Max output
frequency
Parameter setting:
P.38 = 60Hz
Max operation frequency
P.139 =100%
Bias adjustment
P.140 = 100% Gain adjustment
P.141 = 11 Negative Bias, can reverse
P.73 = 1 Voltage signal selection
Note: 1. In ‘external mode’, ‘combined mode 2’ or ‘combined mode 4’, if RH, RM, RL and REX are all ‘off’, the
inverter target frequency is set by the input signal across terminal 2-5/4-5. If AU is ‘on’, the input signal
across terminal 4-5 has higher priority.
2. RL, RM, RH, REX, AU and RUN referred in this paragraph is the function names of ‘multi-function
control terminals’. For the corresponding function selection and features, please refer to Pr80~84, P.86.
For wiring, please refer to Section 2-5.
3. The set value of P.76 must be smaller than the set value of P.38, and if it exceend the set value of P.38, it
will be clamped at the set value of P.38.
4. If P.187=1, P.38 is in the range of 1~1000Hz, P.76 is in the range of 0~1000Hz.
4.20
The input signal across terminal 4-5 and the target frequency (P.39)
P.39 “The maximum output frequency
(the target frequency is set by the
input signal across terminal 4-5)”
Related parameters
P.80~P.84, P.86
“
Multi-function terminals selection
”
P.79
“
Operation mode selection
”
P.196
“
Bias of the input signal
across terminal 4-5
”
P.197
“
Gain of the input signal
across terminal 4-5
”
P.189
“
Default function
”
P.73
“
Voltage signal selection
”
P.17
“
Input signal across terminal
4-5 selection
”
Parameter
Factory setting
Setting range
Remarks
39
50Hz
1~400Hz(Note 4)
When P.189=1
60Hz
When P.189=0