Connection To External Devices - Toshiba TCS-NET Service Manual

TCS-NET General Purpose Interface

Connection to External Devices

This product supports versatile applications including air conditioning through connections to various external
devices such as sensors, key switches, drive circuit control input/output signals, and home automation equipment.
Observe the following precautions when connecting this product to external devices.
General safety precautions to be observed in the circuit design process
• Be sure to install a safety circuit in the external control circuit so that the system will operate safely in the event
of a malfunction or abnormality occurring in this product or a abnormality as a result of external factors.
• Output signals of this product may be kept ON or OFF due to fusing or burnout of the output relay or damage of
the output transistor. To protect against this problem, be sure to provide a safety circuit in the external control
circuit so that the entire system operates safely.
• Take fail-safe measures at the user side in case of a signal line disconnection or an abnormal signal due to power
interruption.
• The life of output relays depends greatly on the contact open/close conditions. When using them, be sure to
verify the performance with actual relays under actual use conditions and then use them within the number of
open/close times that will not affect the relay performance. Continuous use of a deteriorated relay may result in
an insufficient insulation between circuits or a burnout of the relay.
General precautions on system start-up
• For systems that have a load that could be dangerous to humans and/or has equipment connected to the output
circuit, be sure to disconnect the output wiring temporarily and then perform the operation test.
• Before turning on the power supply, make sure that electrical specifications and wiring are all correct.
REQUIREMENT
• The electrical circuit to be connected to this product must be provided on the power supply secondary side and
operate at a voltage of 42 V or less.
• To protect the signals from noise interference use the correct shielded cable for wiring.
• Connection to external relay
To control the power supply primary side of an external circuit by the relay outputs RO1, RO2, RO3, and RO4
of this product, connect the control coil of the IEC-approved relay to RO1 to RO4 to achieve reinforced insulation
from the power supply primary side including the external circuit and control the power supply primary side by
the IEC-approved relay contacts.
This product
RO1, RO2, RO3, and
RO4 contacts
19-EN
IEC-approved relay
X1 contact
X1
IEC-approved relay for the primary side
Reinforced insulation between X1 control coil side circuit and
primary side circuit of the power supply including X1 contact.
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Installation Manual
External circuit connected
Primary side of the
power supply