Motor Control, Solid-State

Catalogs > Industrial Controls Catalog > Motor Control, Solid-State > Contactors

Contactors

Multi-Function Analog Operation

Product Description

The Bulletin 156-B… Analog Control Solid-State Contactor (SSC) is a single-phase device that provides proportional output power in relation to the analog control signal level applied. This microprocessor-based device provides 5 different switching modes integrated into one package. A selector switch on the front of the device is used for the selection of the preferred mode of operation, i.e., either Phase Angle, Distributed Full Cycle, or Burst Control. This multi-function selection makes this SSC ideal for the control of a variety of loads, including heaters and lamps. The control signal can be either 4…20 mA or 0…10V DC. 4 mA or 0V correspond to zero output power, and 20 mA or 10V DC correspond to full output power.
The product is ready to mount on DIN Rail or chassis and comes with an integral heatsink.

Operation

MODE 1:
The Phase Angle switching mode works in accordance with the phase angle control principle, i.e. the output switching point in the AC sine wave depends on the signal level applied at the input. The SSC switches off every time the output current crosses zero. See Figure 1.
MODE 2:
The Distributed mode provides a number of full cycles, evenly distributed over a fixed period of 1.28 s @ 50 Hz (1.07 s @ 60 Hz), depending on the control input. Example: with 50% control input, the SSC output will be on for one cycle and off for one cycle. See Figure 2.
MODE 3, 4, 5:
The Burst Switching mode generates a number of full cycles, depending on the control input over fixed periods of 1 s, 3 s or 10 s for MODES 3, 4 and 5 respectively.
Example: with Mode 4 (3-second burst) configured and 50% control input, the SSC output will be on for 1.5 s and off for 1.5 s. See Figure 3.
Modes 2, 3, 4 and 5 use the zero switching principle, thus ensuring a reduced level of radiated and wire-conducted noise. The Distributed and Burst Switching modes are not recommended for light control due to light-flickering.

LED Indication
The top RED LED indicates the load status. It goes ON whenever the load is activated. The Green LED gives indication of the status of the control input.
Upon application of control current (for the cat. no. 156-Bxx…C1) to terminals A1 – A3, the Green LED will be dimly lit, with its intensity increasing with an increase in control current.
For the cat. no. 156-Bxx…V1, the Green LED will be ON (flickering) upon application of the supply voltage to terminals A2 – A4. Once a control voltage is applied to terminals A1 – A3, the Green LED will be fully ON, if greater than a threshold voltage (approx 0.5V). Note that the first time the device (voltage control version) is to be activated, the mains voltage has to be present for the Green LED to indicate the control status.

Transfer Characteristics

Output power as a function of control input

Control Current [mA]	Control Voltage [V DC]	Output Power [%]§
4	0	0
8	2.5	25
12	5	50
16	7..5	75
20	10	99
§ Time for SSC to process analog changes: 15…20 ms

Mode Selection

• Mode 1
  
• Phase Angle Switching
  
  
• Mode 2
  
• Distributed Control
  Mode
  
• Mode 3
  
• Burst Switching (1 s period)
  
  
• Mode 4
  
• Burst Switching (3 s period)
  
• Mode 5
  
• Burst Switching (10 s period)
  

Functional Diagram