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Frequency Reference
6
-
5
2-Step Switching: Master/Auxiliary
If performing 2-step switching between master and auxiliary speed frequencies, input the master speed fre-
quency reference to control circuit terminal A1 and input the auxiliary speed frequency reference to A2.
When terminal S3 (multi-step speed command 1) is OFF, terminal A1 (master speed frequency reference) will
be the Inverter frequency reference and when terminal S3 is ON, terminal A2 (auxiliary speed frequency refer-
ence) will be the Inverter frequency reference.
Fig 6.5 Master/Auxiliary Frequency Reference Input
Setting Precautions
When inputting a voltage signal to terminal A2, observe the following precautions.
•
Turn OFF pin 2 on DIP switch S1 for switching between voltage and current (factory setting is ON).
•
The parameter H3-08 has to be set to 0.
Inputting Frequency Reference Using Current
When b1-01 is set to 1, you can input the frequency reference from control circuit terminal A2. Input the cur-
rent (4 to 20 mA) in control circuit terminal A2.
When H3-09 (Multi-Function Analog Input Terminal A2 Signal Level Selection) is set to 0 (factory setting)
he input on A2 is added to A1.
Fig 6.6 Frequency Reference Using Current
0 to 10 V
input
Inverter
+V (Power supply: 15 V,
20 mA)
A1 (Master speed frequency
reference)
0 to 10 V input
DIP switch S1
SC Sequence common
S3 Multi-step speed
command 1
Master/
Auxiliary
A2 (Auxiliary speed frequency
reference)
AC (Analog common)
2 k
Ω
2 k
Ω
2 k
Ω
Inverter
+V (Power supply: 15 V, 20 mA)
A1 (Auxiliary speed frequency
reference)
A2 (Master speed frequency
reference)
AC (Analog common)
4 to 20 mA input
DIP switch S1