9.2 Details of Function Codes
9-97
Chap. 9 FUNCTION CODES
Suppose that the internal resistance of the PTC thermistor at the alarm temperature is Rp, the
detection level (voltage) V
v2
is calculated by the expression below. Set the result V
v2
to
function code H27.
)V(10
Rp250
Rp250
R
Rp250
Rp250
Vc
1
1
×
+
+
+
=
・
・
Connect the PTC thermistor as shown below. The voltage obtained by dividing the input
voltage on terminal [C1] with a set of internal resistors is compared with the detection level
voltage specified by H27.
H30
Communications Link Function (Mode selection)
Using the RS-485 communications link allows you to issue frequency commands and run
commands from a computer or PLC at a remote location, as well as monitoring the inverter
running information and the function code data.
H30 specifies the sources of those commands--"inverter itself" and "computers or PLCs via
the RS-485 communications link."
Command sources selectable
Command sources Description
Inverter itself Command sources except RS-485 communications link
Frequency command source: Specified by F01 or C30, or
multistep frequency command
Run command source: Via the keypad or digital input
terminals selected by F02
RS-485 communications link Via the RJ-45 port
Command sources specified by H30
Data for H30 Frequency command Run command
0 Inverter itself (F01, C30) Inverter itself (F02)
1 Via the RS-485 communications link Inverter itself (F02)
2 Inverter itself (F01, C30) Via the RS-485 communications link
3 Via the RS-485 communications link Via the RS-485 communications link
For details, refer to the RS-485 Communication User's Manual (MEH448).
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