YOKOGAWA UT35A-L, User Manual

Page: 113 / 150

17-8
IM 05P04D41-01EN
17.4.3 Limit Control Output (Relay) Wiring
CAUTION
1) The use of inductance (L) loads such as auxiliary relays, motors and solenoid
valves causes malfunction or relay failure; always insert a CR filter for use with
alternating current or a diode for use with direct current, as a spark-removal
surge suppression circuit, into the line in parallel with the load.
2) If there is a risk of external lightning surges, use a lightning arrester etc.
3) Relays cannot be used for a small load of 10 mA or less.
4) Since the insulation provided to each relay output terminal is Functional
insulation, provide Reinforced insulation to the external of the device as
necessary. (Refer to the drawing below.)
This product
Functional
insulation
A safety
voltage circuit
A safety
voltage circuit
This product
Reinforced insulation
Reinforced insulation
Functional
insulation
A hazardous
voltage circuit
A hazardous
voltage circuit
A safety
voltage circuit
A safety
voltage circuit
This product
Reinforced insulation
Reinforced insulation
Functional
insulation
A hazardous
voltage circuit
A hazardous
voltage circuit
A hazardous
voltage circuit
A hazardous
voltage circuit
DC Relay Wiring
R
External DC power supply
Relay
UT35A-L
UT’s contact
Diode
(Mount it directly
to the relay coil
terminal (socket).)
Relay
(Use one with a relay coil rating
less than the UT’s contact rating.)
AC Relay Wiring
UT35A-L
R
CR filter
(Mount it directly
to the relay coil
terminal (socket).)
Relay
(Use one with a relay coil
rating less than the UT’s
contact rating.)
UT’s contact
External AC power supply
17.4 Wiring