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PRECAUTIONS IN USING THE PM4H SERIES
5. Superimposed surge of power
supply (PM4H series common)
For the superimposed surge of power
supply, the standard waveform is taken
as the standard value for surge-proof
voltage.
If external surge occurs exceeding the
specified value, the internal circuit may
break down. In this case, use a surge
absorption element.
6. Acquisition of CE marking
Please abide by the conditions below
when using in applications that comply
with EN61812-1.
1) Overvoltage category III, pollution
level 2
2) This timer employs a power supply
without a transformer, so the power and
input signal terminals are not insulated.
(PM4H-A only)
(1) When a sensor is connected to the
5) You must use a terminal socket or
socket for the installation. Do not touch
the terminals or other parts of the timer
when it is powered. When installing or
un-installing, make sure that no voltage
is being applied to any of the terminals.
6) Do not use this timer as a safety cir-
cuit. For example when using a timer in a
heater circuit, etc., provide a protection
circuit on the machine side.
Operation voltage
100 to 240V AC
100 to 120V AC
200 to 240V AC
48 to 125V DC
12V DC, 24V DC
24V AC/DC
Surge voltage
4,000V
500V
input circuit, install double insulation on
the sensor side.
(2) In the case of contact input, use dual-
insulated relays, etc.
3) The load connected to the output con-
tact should have basic insulation.
This timer is protected with basic insula-
The positive and negative voltages are
applied each five times between the
power pins.
The typical surge absorption elements
include a varistor, a capacitor, and a
diode. If a surge absorption element is
used, use an oscilloscope to see
tion and can be double-insulated to meet
EN/IEC requirements by using basic
insulation on the load.
4) Please use a power supply that is pro-
tected by an overcurrent protection
device which complies with the EN/IEC
standard (example: 250 V 1 A fuse, etc.).
whether or not the foreign surge exceed-
ing the specified value appears.
33
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