Hitachi L100 IP Series, Инструкция по эксплуатации

Страница: 35 / 94

Chapter 7 – Control circuit terminal functions
7-7
AT: Analog set value using current 4-20mA
Terminal function
When a digital input configured as AT is activated then the frequency set value will be represented by the
current (4-20mA) fed into the OI terminal. When the AT input is not active then the frequency set value will
be represented by the voltage (0-10V) present at the O terminal.
5 4 3 2 1 P24
AT
Configuration
A 01 C 01 – C 05
1) First the frequency source setting must be configured under function A 01 . The factory setting of 01
means that the voltage at the O terminal or the current into the OI terminal are used for setting the
frequency (depending on whether the AT input is activated or not). Set the parameter to 01 if it has not
already been set to this value.
2) Configure one of the digital inputs 1 – 5 as AT input by entering the parameter 16 under C 01 – C 05 .
Remarks
•
If none of the programmable digital inputs has been programmed as AT input then the voltage resp.
current set values present on terminal O resp. OI are added.
2CH: Second stage acceleration/deceleration
Terminal function
When a digital input configured as 2CH is activated then the motor is accelerated or decelerated using the 2.
stage acceleration or deceleration time. When the 2CH input is deactivated again the inverter is switched
back to acceleration respectively deceleration time 1.
5 4 3 2 1 P24
2C
H
FW
Terminal 2CH
Output frequency
Run command via
FW or RV
1. acceleration
2. acceleration
Configuration
A 92 – A 94 C 01 – C 05
1) Configure the desired value for 2. acceleration or deceleration time under functions A 92 and A 93 .
Then enter the parameter 00 under A 94 so that the switchover to the 2. stage acceleration/deceleration
can be activated using the 2CH terminal (this is the factory setting).
2) Configure one of the digital inputs 1 – 5 as 2CH input by entering the parameter 09 under C 01 – C 05 .
Remarks
•
When a parameter of 01 is entered under A 94 then an automatic switchover to the 2. stage accelera-
tion/deceleration is possible as soon as the frequencies set under A 95 resp. A 96 are being passed.
•
The value for the 1. stage acceleration/deceleration time can be configured using F 02 and F 03 .