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MULTI-BEAM 2-Wire AC Power Block

Modules

Datasheet

MULTI-BEAM 2-wire ac power block for MULTI-BEAM 2-wire modular photoelectric sensors

MULTI-BEAM 2-wire power block models 2PBA, 2PBB, and 2PBD contain a low voltage power supply that uses a unique circuit to take a very small leakage current through the load and convert it to the dc power required to run the scanner block and logic module.

These power blocks also contain a solid-state switch that operates the load, and a transient suppression circuit to prevent false operation from high voltage spikes on the incoming line.

These power blocks are completely solid-state for unlimited operating life. Model 2PBR is a 4-wire power block that works with 2-wire scanner blocks and logic modules and offers an SPST "hard" contact for switching heavy ac or dc loads.

NOTE: MULTI-BEAM 2-wire AC power blocks are color-coded black.

Figure 1. Model 2PBB

	Models	Operating	Outputs	Specifications	Certifications
		Voltage
	2PBA	105 to 130 V ac;
		50/60 Hz
			SPST solid-state switch, 3/4 amp	On-State Voltage Drop: Less than 10 V
	2PBB	210 to 250 V ac;	maximum (derated to 1/2 amp at	Leakage Current: Less than 1 mA (resistive or
		50/60 Hz	70 °C). 10 amps maximum inrush
			for 1 second (non-repeating).	inductive loads)
	2PBD	22 to 28 V ac;			N/A
		50/60 Hz
				Contact Rating: 250 V ac max, 30 V dc max, 5
				amps max (resistive load); install MOV across
				contact if switching an ac inductive load.
		105 to 130 V ac;	SPST electromechanical relay	Closure time: 20 ms
	2PBR				N/A
		50/60 Hz	contact.	Release time: 20 ms
				Maximum Switching Speed: 20 operations/
				second
				Mechanical Life: 10,000,000 operations

Wiring Diagrams

2PBA, 2PBB, and 2PBD Power Blocks

MULTI-BEAM 2-wire power blocks offer the ultimate in simplicity of sensor wiring. They wire directly in series with an ac load, exactly like a limit switch. Response time of 2-wire power blocks is determined by the scanner block, whose response time is 10 ms on/off. A built-in false pulse protection circuit holds the output OFF for 10 ms after power is initially applied to the power block. MULTI-BEAM 2-wire power blocks will operate from –40 to 70 °C (–40 to 158 °F). Resistive loads must be less than 15,000 ohms and inductive loads must be greater than 1.2 watts (10 mA).

NOTE: Output has a maximum load capacity of 3/4 A, a maximum resistive load of 15 kOhms, and a minimum inductive load of 1.2 watts (10 mA).

Original Document	14 March 2014
03508 Rev. A

03508

MULTI-BEAM 2-Wire AC Power Block Modules

			Load	1
				Solid-State
	AC Supply
				Contact
	Voltage
				2

L1

L2

V ac

(See specifications)

2PBA 2PBB 2PBD

1

2

Load

Figure 3. Basic Wiring of 2-Wire MULTI-

BEAM

			Signal from
		Switching	Logic Module	A
		Element	on
Transient DVDT& Suppression			off
		Drive
		Circuit
			No Connection	B
			+8 V dc	C
			Power to Logic Module
Switching
	+		& Scanner Block
Regulated
Power Supply	í		Common	D

Figure 2. Functional Schematics

MULTI-BEAM 2-wire sensors wire in series with an appropriate load. This combination, in turn, wires directly across the ac line. A 2-wire sensor may be connected exactly like a mechanical limit switch.

The MULTI-BEAM remains powered when the load is "off" by a residual current that flows through the load. This off-state leakage current is always less than 1 mA. The effect of this leakage current depends upon the characteristics of the load. The voltage that appears across the load in the off-state is equal to the leakage current of the sensor multiplied by the resistance of the load: Voff = 1 mA × Rload.

If this resultant off-state voltage is less than the guaranteed turn-off voltage of the load, the interface is direct. If the off-state voltage causes the load to stay "on," connect an artificial load resistor in parallel with the load to lower its effective resistance. Most loads, including most programmable logic controller (PLC) inputs, will interface to 2-wire sensors with 1 mA leakage current without needing an artificial load resistor. There is no polarity requirement. Either wire may connect to terminal #1 and the other to terminal #2.

CAUTION: All three components of a MULTI-BEAM 2-wire sensor will be destroyed if the load becomes a short circuit.

Multiple 2-wire MULTI-BEAMs may be wired together in parallel to a load for OR or NAND

L1

L2

logic functions. When sensors are wired in parallel, the off-state leakage current through

V ac

the load is equal to the sum of the leakage currents of the individual sensors.

Consequently, loads with high resistance, like small relays and electronic circuits, may

(See specifications)

require artificial load resistors.

2PBA

Two-wire MULTI-BEAM sensors have a 100 ms power-up delay for protection against false

outputs. When 2-wire MULTI-BEAMs are wired together in parallel, any power block with an

2PBB

2PBD

energized output robs all the other power blocks of the current they need to operate. When

1

2

the energized output drops, there will be a 0.1 second delay before any other MULTI-BEAM

can energize. As a result, the load may momentarily drop out.

Two-wire MULTI-BEAM sensors cannot wire in series with other 2-wire sensors unless

2PBA

power block model 2PBR is used. If series connection of 2-wire ac sensors is required,

2PBB

consider models within the VALU-BEAM or MINI-BEAM families.

2PBD

1

2

Load

Figure 4. 2-Wire MULTI-BEAMs in Parallel

2

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P/N 03508 Rev. A