SOILD STATE RELAY 120D45

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Item Description: SSR Series 120 VAC 45 A ZeroCross DC Control Chassis Moun

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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

Form 859-990514
SOLID-STATE RELAYS
DATA SHEET
page 10/12
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com
Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: support@opto22.com • FaxBack: (800)474-OPTO
Transformer Loads
Solenoid Valve and Contactor Loads
Careful consideration should be given to the selection
of the proper SSR for driving a given transformer. Transformers
are driven from positive saturation of the iron core to negative
saturation of the core each ½ cycle of the alternating
voltage. Large inrush currents can occur during the first ½ cycle
of line voltage when a zero voltage SSR happens to turn on
during the positive ½ cycle of voltage when the core is
already in positive saturation. Inrush currents greater than
10 times rated transformer current can easily occur.
The following table provides a guide for selecting the
proper SSR for a given transformer rating.
All Opto 22 SSRs are designed to drive inductive loads such as solenoid
valves and electromechanical contactors. The built-in snubber in each SSR
assures proper operation into inductive loads. The following table is a
guide in selecting an SSR to drive a solenoid or contactor.
Tips (Continued)
Applications
Control Current Calculation
All Opto 22 DC controlled SSRs have a control circuit consisting of 1000 ohms in
series with an LED. Since 3 volts is required to turn on any SSR, the maximum current
required is (3 volt - 1 volt) divided by 1000 ohms which equals 2.0 mA. The 1 volt is subtracted
from the 3 volt signal because 1 volt is dropped across the LED. For higher control voltages,
an external resistor can be added in series with the control voltage to limit the control
current. To limit the control current to 2 mA, calculate the external resistor R
C
= 500 (E
C
- 3)
where E
C
= the control voltage.
The DC control voltage range is 3–32 VDC. To calculate the control current for any
voltage within the 3–32 VDC range, use the formula:
E
C
- 1
1000
I
C
=
where R
C
= zero.
With a 5V control signal,
I
C
= = 4 mA.
5
- 1
1000
120-Volt Coils
SSR CURRENT
RATING
SOLENOID CONTACTOR
2-Amp 1-Amp NEMA Size 4
4-Amp 3-Amp NEMA Size 7
240-Volt Coils
SSR CURRENT
RATING
SOLENOID CONTACTOR
2-Amp 1-Amp NEMA Size 7
4-Amp 3-Amp NEMA Size 7
120-Volt Transformers
SSR MODEL TRANSFORMER
P or MP 120D2 100 VA
Z120D10 500 VA
120D3 100 VA
P or MP 120D4 250 VA
120D10 or 120A10 500 VA
120D25 or 120a25 1 KVA
120D45 2 KVA
240-Volt Transformers
P or MP240D2 200 VA
7240D10 1 KVA
120D3 200 VA
P or MP240D4 500 VA
240D10 or 240A10 1 KVA
240D25 or 240A25 2 KVA
240D45 4 KVA
480-Volt Transformers
SSR MODEL TRANSFORMER
480D10-12 5-Amp Primary
480D15-12 5-Amp Primary
Form 859-990514
SOLID-STATE RELAYS
DATA SHEET
page 11/12
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com
Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: support@opto22.com • FaxBack: (800)474-OPTO
Solid-State Relays In Series
In applications requiring greater current rating at higher voltage,
two Opto 22 SSRs may be operated in series for double the
voltage rating. The built-in snubber in each SSR assures proper
voltage sharing of the two SSRs in series. In the diagram below,
two 240-volt, 45-amp SSRs are connected in series for operation
on a 480-volt line. The control is shown with a parallel hook-up
but it should be noted that a serial connection can also be
implemented.
Lamp Loads
Since all Opto 22 SSRs are zero voltage switching, they
are ideal for driving incandescent lamps because the
initial inrush current into a cold filament is reduced.
The life of the lamp is increased when switched by a
zero voltage turn on SSR. The following table is a guide
to selecting an Opto 22 SSR for switching a given
incandescent lamp.
Heater Loads
Care should be taken in selecting a SSR for driving a heater load if
the load is cycled on and off in a continuous manner as might occur in
a temperature control application. Constant cycling can cause thermal
fatigue in the thyristor chip at the point where the chip bonds to the
lead frame. Opto 22 employs a thick copper lead frame for mounting
the SCR chips in the power series SSRs to eliminate thermal fatigue
failures. In addition, Opto 22 recommends operating any SSR at 75%
rated current for cycling heater loads to ensure complete reliability.
The following table is a guide to selecting the proper SSR for a given
heater load.
Tips (Continued)
Applications
120 Volt Lamps
SSR CURRENT RATING LAMP RATING
2-Amp 100 Watt
4-Amp 400 Watt
10-Amp 1 Kilowatt
25-Amp 2 Kilowatt
45-Amp 3 Kilowatt
240 Volt Rating
SSR CURRENT RATING LAMP RATING
2-Amp 200 Watt
4-Amp 800 Watt
10-Amp 2 Kilowatt
25-Amp 4 Kilowatt
45-Amp 6 Kilowatt
Nominal SSR
Current Rating
Maximum
Recommended
Heater Current
2-Amp 1½-Amp
4-Amp 2½-Amp
10-Amp 7½-Amp
25-Amp 18-Amp
45-Amp 35-Amp
10 480V 8-Amp
10 480V 8-Amp
Form 859-990514
SOLID-STATE RELAYS
DATA SHEET
page 12/12
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com
Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: support@opto22.com • FaxBack: (800)474-OPTO
Single-Phase Reversing Motor Control
Three-Phase Motor Control
Three-Phase Reversing Motor Control
Three-phase motors may
be controlled by solid-state
relays as shown. A third
SSR as shown is optional,
but not necessary. The
control windings may be
connected in series or
parallel. Care should be
taken to ensure that surge
current drawn by the motor
does not exceed surge
current rating of the SSR.
Three-phase reversing motor control can be implemented with four
SSRs as shown in the connection diagram. The SSRs work in pairs
with SSR1 and SSR3 operated for rotation in one direction and SSR2
and SSR4 operated for rotation in the reverse direction. The
resistor R1 as shown in the connection diagram protects against
line-to-line shorts if SSR1 and SSR4 or SSR3 and SSR2 are on at
the same time during the reversing transition period. Use the
following table as a guide to the proper selection of an SSR for
this application.
The resistors are unnecessary if the
control circuit is designed to ensure
one SSR is off before the other SSR is
on.
1.4 EAC
10 x SSR full load rating
1.4 x 120
10 x 10
All products and/or company names throughout this datasheet are generally trademarks or registered trademarks of their respective companies.
Tips (Continued)
Applications
The circuit diagram illustrates a typical 1 Ø motor winding inductance and the phase shift
capacitor can cause twice line voltage to appear across the open SSR. A 240-volt SSR should be
used for a 120-Volt line. During the transition period when one SSR is turned on and the other
SSR is going off, both SSRs may be on. In this case, the capacitor may discharge through the
two SSRs, causing large currents to flow, which may destroy the SSRs. The addition of RL as
shown will protect the SSRs from the short circuit capacitor discharge current.
CALCULATE RL as: RL =
EXAMPLE: 10 amp SSR
120 V AC Line
RL = = 1.7 ohm
240-Volt 3θ
θθ
θ Motors
SSR MODEL MOTOR
Z240D25 1/3 HP
Z240D10 3/4 HP
240D10 3/4 HP
240A10 3/4 HP
240D25 2 HP
240A25 2 HP
240D45 3 HP
480-Volt 3θ
θθ
θ Motors
SSR MODEL MOTOR
480D10-12 1-½ HP
480D15-12 1-½ HP
Opto 22
Relay
Motor
Full Load
Rating
Resistor for
120V line
Resistor for
240V line
3-Amp 1.25-Amp 4 ohm 50 W 8 ohm 50 W
10-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W
25-Amp 8-Amp .5 ohm 100 W 1 ohm 100 W
45-Amp 16-Amp .25 ohm 150 W .5 ohm 150 W
15-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W
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