Banner MULTI-BEAM Series - Manual (Page 27)

L2 L1
V ac
(See Specifications)
1 2 LOAD
2PBB
Operating voltage: 210 to 250V ac, 50/60Hz
Models
2PBA
Operating voltage: 105 to 130V ac, 50/60Hz
2PBD
Operating voltage: 22 to 28V ac, 50/60Hz
Output: SPST solid-state switch, 3/4 amp
maximum (derated to 1/2 amp at 70 degrees C).
Maximum inrush: 10 amps for 1 second
(non-repeating).
On-state voltage drop: less than 10 volts
Leakage current: less than 1 milliamp
(resistive or inductive loads)
MULTI-BEAM 2-wire power blocks offer the ultimate in simplicity of sensor hookup. 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, which is 10 milliseconds on/off. A built-in false pulse
protection circuit holds the output OFF for 100 milliseconds after power is initially applied to the
power block. 2-wire power blocks will operate from -40 to +70 degrees C (-40 to +158 degrees
F). Resistive loads must be less than 15,000 ohms and inductive loads must be greater than 1.2
watts (10 milliamps).
Additional specifications, both models:
2PBR
(Electromechanical relay output)
Input: 105 to 130V ac, 50/60Hz
Output: SPST electromechanical relay contact.
2PBR2
(Electromechanical relay output)
Input: 105 to 130V ac, 50/60Hz
Output: SPDT electromechanical relay contacts,
both contacts common to terminal #1 (L1).
Contact rating: 250V ac max, 30V dc max,
5 amps max. (resistive load); install MOV across
contact if switching an ac inductive load.
Closure time: 20 milliseconds
Release time: 20 milliseconds
Maximum switching speed: 20 operations/second
Mechanical life of relay: 10,000,000 operations
Connections
L2 L1
V ac
1 2
3 4
V ac/dc
LOAD
L2 L1
1 2
3 4 LOAD
105 to 130V ac, 50/60Hz
LOAD
Model 2PBR actually requires a 4-wire hookup and model 2PBR2 requires a 3- or 4-wire hookup,
even though they only work with 2-wire scanner blocks and logic modules. Both are powered by
120V ac across terminals #1 and 2. The 2PBR offers an SPST "hard" relay contact between
terminals #3 and 4. Model 2PBR2 is an SPDT version, with both contacts common to terminal
#1: terminal #3 is a normally open output, and terminal #4 is normally closed. These
configurations allow MULTI-BEAM sensors to directly interface large loads which draw more
than 3/4 amp like clutches, brakes, large contactors, and small motors. Model 2PBR can switch
both ac and dc loads; model 2PBR2 switches the ac line voltage to an ac load (see connection
diagrams). The 2PBR and 2PBR2 also eliminate the problem of voltage drop from series strings
of sensors operating low voltage ac loads. NOTE: install an appropriate value MOV (metal oxide
varistor) transient suppressor across the power block relay contacts when switching an ac
inductive device.
Functional Schematics
MULTI-BEAM 2-wire power block models 2PBA, 2PBB, and 2PBD contain a low voltage power supply which
utilizes 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. They also contain the solid-state switch that operates the load, and a
transient suppression circuit to prevent false operation from high voltage spikes on the incoming line. They are
completely solid-state for unlimited operating life.
Model 2PBR is a 4-wire power block which works with 2-wire scanner blocks and logic modules and offers an SPST
"hard" contact for switching heavy ac or dc loads. Model 2PBR2, also for use with 2-wire scanner blocks and logic
modules, uses a 3- or 4-wire hookup with SPDT "hard" contacts for switching heavy ac loads.
NOTE: MULTI-BEAM 2-wire ac power blocks are color-coded black.
MULTI-BEAM
2-wire Power Blocks
27