PM5S-A-24-240V Panasonic Electric Works, PM5S-A-24-240V Datasheet - Page 20

• Manufacturer Part Number: PM5S-A-24-240V
• Description: TIMER RELAY ANALOG 24-240V
• Manufacturer: Panasonic Electric Works
• Series: PM5Sr
• Type: Timerr

Specifications of PM5S-A-24-240V

• Relay Type: Integrated
• Function: Programmable (Multi-Function)
• Circuit: DPDT (2 Form C)
• Delay Time: 0.1 Sec ~ 500 Hrs
• Output Type: Mechanical Relay
• Contact Rating @ Voltage: 5A @ 250VAC
• Voltage - Supply: 24 ~ 240VAC/DC
• Mounting Type: DIN Rail
• Termination Style: Screw Terminal
• Timing Adjustment Method: Hand Dial
• Timing Initiate Method: Input Voltage, Trigger Signal
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 255-2831

PRECAUTIONS IN USING THE TIMERS
Cautions for circuits
1. Protective circuit for timer contact
In the circuit that switches an inductive load, a contact failure may occur at a contact point due to surge or inrush current resulting
from that switching. Therefore, it is recommended that the following protective circuit be used to protect the contact point.
2. Type of Load and Inrush Current
The type of load and its inrush current
characteristics, together with the switch-
ing frequency are important factors
which cause contact welding.
Particularly for loads with inrush cur-
rents, measure the steady state current
and inrush current and use a relay or
magnet switch which provides an ample
margin of safety. The table below shows
the relationship between typical loads
and their inrush currents.
When you want large load and long life
of the timer, do not control the load direct
with a timer. When the timer is designed
to use a relay or a magnet switch, you
can acquire the longer life of the timer.
3. Connection of input
The PM4H and LT4H series use power
supply without a transformer (power and
input terminals are not insulated). In
connecting various kinds of input signals,
therefore, use a power transformer in
which the primary side is separated from
the ungrounded secondary side as
shown in Fig. A, for the power supply for
a sensor and other input devices so that
short-circuiting can be prevented.
10
Sodium vapor lamp load
Incandescent lamp load 10 to 15 times the steady state current
Application
Device Selection
Features/Notes
Mercury lamp load
Transformer load
Type of load
Capacitive load
Resistive load
Solenoid load
Motor load
Circuit
AC
DC
If the load is a relay or solenoid, the release time lengthens.
Effective when connected to both contacts if the power supply voltage is
24 or 48 V and the voltage across the load is 100 to 200 V.
If the load is a timer, leakage current
flows through the CR circuit causing
faulty operation.
Note: If used with AC voltage, be sure
the impedance of the load is sufficiently
smaller than that of the c and r.
As a guide in selecting r and c,
Values vary depending on the properties of the load and variations in timer character-
istics.
Capacitor c acts to suppress the discharge the moment the contacts open. Resistor r
acts to limit the current when the power is turned on the next time. Test to confirm.
Use a capacitor with a breakdown voltage of 200 to 300 V. Use AC type capacitors
(non-polarized) for AC circuits.
10 to 20 times the steady state current
20 to 40 times the steady state current
5 to 10 times the steady state current
5 to 15 times the steady state current
1 to 3 times the steady state current
1 to 3 times the steady state current
c: 0.5 to 1 µF per 1 A contact current
r: 0.5 to 1 Ω per 1 V contact voltage
Steady state current
Inrush current
Timer contact
(see note.)
Available
r
CR circuit (r: resistor c: capacitor)
c
Do not use a single coil transformer
(e.g., Sly-Duck). Otherwise, the internal
circuit of the timer will be short-circuited
as shown in Fig. B resulting in break-
down.
4. Long Continuous Current Flow
Long continuous current flow through the
timer (approx. one month or longer)
cause generation of heat internally,
which degrade the electronic parts. Use
the timer in combination with a relay and
avoid long continuous current flow
through the timer.
Timer contact
Available
Available
( Fig. A ) Good example
( Fig. B ) Bad example
AC power supply
AC power supply
AC power supply
—
c
r
Insulation transformer
Insulation transformer
Single coil transformer
Timer
Timer
Timer
(+)
(–)
(+)
(–)
(+)
(–)
(–)
(–)
(–)
Alternative
current flow
( e.g. , sensor )
( e.g. , sensor )
( e.g. , sensor )
Input device
Input device
Input device
The diode connected in parallel caus-
es the energy stored in the coil to
flow to the coil in the form of current
and dissipates it as joule heat at the
resistance component of the induc-
tive load.
This circuit further delays the release
time compared to the CR circuit.
(2 to 5 times the release time listed in
the catalog)
Use a diode with a reverse break-
down voltage at least 10 times the
circuit voltage and a forward cur-
rent at least as large as the load
current.
In electronic circuits where the cir-
cuit voltages reverse breakdown
voltage of about 2 to 3 times the
power supply voltage.
Timer contact
Not available
Diode circuit
Available
Diode
(1) When using contact output
(2) When using non-contact output
5. Leakage current
1) For connecting and disconnecting
operating voltage to the timer, a circuit
should be used, which will prevent the
flow of leakage current. For example, a
circuit for contact protection as shown in
Fig A. will permit leakage current flow
through R and C, causing erroneous
operation of the timer. Instead, the cir-
cuit shown in Fig. B should be used.
Operating voltage
Operating voltage
( Fig. A )
( Fig. B )
R
R
Using the rated voltage characteris-
tics of the varistor, this circuit pre-
vents excessively high voltages
from being applied across the con-
tacts. This circuit also slightly
delays the release time.
R
R
Leak current
R
RT
Varistor circuit
Timer contact
T
ZNR varistor
T
Available
Available
R
C
C
R
—
RT
T
R
T
T
Timer
Timer