TOHO ELECTRONICS TTM-00BT - Manual (Page 9)

9
4.3 Cautions on making the connections
Warning
• Before making the connections, turn off this product. Otherwise you may get an electrical shock.
Warnings
• This product will not begin control for about 10 seconds after being turned on. (It will not activate its
outputs or other components.) Be careful if you wish to use the product as an interlocking circuit.
• Check the operation manual and other documents to ensure that you make the correct connections for
the temperature input terminal, power terminal, and other terminals.
• To connect a resistance bulb to this product, use wiring having a line resistance of no more than
5
Ω
per wire.
• To connect a thermocouple to this product, use a specified kind of compensating lead wire or
element wire.
• Use a shielded wire if you wish to use this product near a noise source. Do not wire an
input/output line in the same duct or conduit tube.
• Separate the input/output signal lines at least 50cm from the power line and load line.
5. Before conducting control
Selecting PID control Selecting ON/OFF control
This product is factory-configured to a "proportional
band" of 3.0. This product can conduct control in that
state. For better control, however, auto-tune (AT) this
product. AT automatically sets settings (values P, I, and
D) required for control. For AT, put this product into an
actual operating state (a state where the sensor input,
control output, and other components are wired). AT
takes some time. This product is factory-configured to a "sensitivity" of 0.
If conducting control causes the relay to flutter, increase
the sensitivity to reduce the flutter. If conducting
control causes this product to stabilize at a level lower
than the set temperature, increase the parameter "OFF
point" to change the ON/OFF point without changing the
setting.
6. Table of identifiers (codes)
a) Identifier: A code that represents an item. Enter the code into the identifier field in the message.
(The code is a three-digit figure.) The □ in the frame represents SP (:space:ASCII code...20H).
b) Name: Item name
c) R/W: Specifies which function (read or write) is possible for an identifier into the current memory
bank, or whether both of those functions are possible.
r/w: Specifies which function (read or write) is possible for a memory bank other than the current
one, or whether both of these functions are possible. (This identifier can be read and written in a
memory bank.)
d) Description: Gives a description and specifies a set range and other details.
Note: For the R/W to a character not meeting the display conditions, this product responds with
"NAK2."