Omron H3RN Manual page 7

H3RN
Precautions
When using the H3RN in any place where the ambient temperature
is more than 50"C, supply 90% to 110% of the rated voltages (at
12 VDC: 95% to 110%).
Do not leave the H3RN in time-up condition for a long period of time
(for example, more than one month in any place where the ambient
temperature is high), otherwise the internal parts may become dam-
aged. Therefore, the use of the H3RN with a relay as shown in the
following circuit diagram is recommended.
The H3RN must be disconnected from the socket when setting the
DIP switch, otherwise the user may touch a terminal imposed with a
high voltage and get an electric shock.
Do not connect the H3RN as shown in the following circuit diagram
on the right hand side, otherwise the H3RN's internal contacts differ-
ent from each other in polarity may become short-circuited.
Correct
Use the following safety circuit when building a self-holding circuit
with the H3RN and an auxiliary relay, such as a G2R Relay, in com-
bination.
In the case of the above circuit, the H3RN will be in pulse operation.
Therefore, if the circuit shown on page 9 is used, no auxiliary relay
will be required.
10
H3RN
G2R Relay
Incorrect
H3RN
G2R Relay
Do not use the SPDT contact in a circuit which may cause short-cir-
cuiting at three points (otherwise, short-circuiting of the power sup-
ply may occur) because the SPDT contact of H3RN-1/-11 is com-
posed of an SPST-NC contact.
Short-circuit current
Power supply
for load
1
Do not set to the minimum setting in the flicker modes, otherwise the
contact may be damaged.
Do not use the H3RN in places where there is excessive dust, corro-
sive gas, or direct sunlight.
Make sure that there is a space of 3 mm or more between any H3RN
Models next to each other. (When using the P2RF-j-E Socket, a
space of 3 mm or more will be secured.) If a space of 3 mm or more is
not secured, the ambient temperature must be less than 50"C.
The internal parts may become damaged if a supply voltage other
than the rated ones is imposed on the H3RN.
Precautions for VDE Conformance
The H3RN as a built-in timer conforms to VDE 0435/P2021 pro-
vided that the following conditions are satisfied.
Handling
Do not touch the DIP switch while power is supplied to the H3RN.
Before dismounting the H3RN from the socket, make sure that no
voltage is imposed on any terminal of the H3RN.
Wiring
Only a load with basic isolation can be connected to the output con-
tact. The H3RN is a model with basic isolation. Therefore, the H3RN
and the load will ensure reinforced isolation, thus meeting VDE
standards.
Insulation requirement: Overvoltage category II,
pollution degree 2
(with a clearance of 1.5 mm and a creep-
age distance of 2.5 mm at 240 VAC)
H3RN
3
4
2
5