Common to All Timers
H3DS
B-49
Ti
m
e
rs
If a relay or transistor is connected to two or more Timers, the input
terminals of those Timers must be wired properly so that they will not
be different in phase or the terminals will be short-circuited to one
another (refer to the figures below).
The H3DS Series is provided with a transformerless power supply
system.
Input Wires
The input wires must be as short as possible. If the floating capacity
of wires exceeds 2,000 pF (approx. 17 m for cables with 120 pF/m),
the operation will be affected. Pay particular attention when using
shielded cables.
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Precautions for EN61812-1
Conformance
The H3DS as a built-in timer conforms to EN61812-1 provided that
the following conditions are satisfied:
The output section of the H3DS is provided only with basic isolation.
To ensure reinforced isolation required by the EN61812-1, provide
supplementary basic isolation on the load side connected to the out-
put.
The H3DS itself is designed according to the following:
•
Overvoltage category
III
•
Pollution degree 2
On the above basis:
Operation parts on the front and bottom: Reinforced isolation
– With clearance of 5.5 mm and creepage distance of 5.5 mm at
230 VAC
Output: Basic isolation
– With clearance of 3 mm and creepage distance of 3 mm at
230 VAC
■
Environment
When using the Timer in an area with excess electronic noise, sepa-
rate the Timer, wiring, and the equipment which generates the input
signals as far as possible from the noise sources. It is also recom-
mended to shield the input signal wiring to prevent electronic interfer-
ence.
Organic solvents (such as paint thinner), as well as very acidic or
basic solutions can damage the outer casing of the Timer.
Do not use the Timer in places where it is exposed to dust, corrosive
gas, or direct sunlight.
When storing the Timer, make sure that the ambient temperature
and humidity are within the rated values. Leave the Timer at room
temperature for at least three hours before using the Timer if it has
been stored at an ambient temperature of –10
°
C or below.
Leaving the Timer with outputs ON at a high temperature for a long
time may hasten the degradation of internal parts (such as electro-
lytic capacitors). Therefore, use the product in combination with
relays and avoid leaving the product as long as more than 1 month
with the output turned ON.
■
Others
If the Timer is mounted on a control board, dismount the Timer from
the control board or short-circuit the circuitry of the power board
before carrying out a voltage withstand test between the electric cir-
cuitry and non current-carrying metal part of the Timer, in order to
prevent the internal circuitry of the Timer from damage.
A2
A2
A1
A1
B1
B1
Contact or transistor for
external input signal
Short-circuit
current
H3DS-ML
@
H3DS-ML
@
Power supply
Incorrect
A2
A2
A1
A1
B1
B1
Contact or transistor for
external input signal
Correct
Short-circuit
current
H3DS-ML
@
H3DS-ML
@
Power supply
