SDM-CD8S

Eight-Channel Solid-State DC Controller
SDM-CD8S

SDM-CD8S

Orderable

Eight-Channel Solid-State DC Controller

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Model:
SDM-CD8S
Item Number:
19507
Warranty:
1 year

Overview

With an SDM-CD8S, your data logger can control dc devices that have a moderate current load, such as solenoids, solenoid valves, dc motors, stepper motors, lights, horns, heaters, and fans. The SDM-CD8S is ideal for applications requiring only a few control ports, where a larger, high-powered relay module (such as the SDM-CD16S) is not necessary.

Key Advantages

Expands Data Logger Control Capacity
For dc devices with moderate current loads

Technical Description

The SDM-CD8S has eight dc-voltage outputs and returns that can be switched on and off manually or under data logger control.

  • When the manual control switch is in the ON position, outputs are controlled by the position of the individual rocker switches.
  • In the OFF position the state of the relays is controlled by the SDM commands from the data logger.

The voltage range for this device is 8 to 26 Vdc. It can deliver up to 1 A per channel with a maximum of 6 A total for all channels. The power input (8 to 26 Vdc) powers both the outputs and the SDM-CD8S logic.

SDM Operation

The SDM-CD8S is a synchronously addressed data logger peripheral. Data logger control ports 1, 2, and 3 are used to address the SDM-CD8S, then clock out the desired state of each of the eight control ports. Up to 15 SDM-CD8S controllers may be addressed, making it possible to control a maximum of 120 ports from the first three data logger control ports.

 

Benefits

  • Provides a manual override
  • Enables multiple SDM-CD8S devices to be wired to one data logger, increasing the number of devices that can be controlled
  • Includes LEDs that provide a visual indicator of active outputs

Specifications

Function
Allows the data logger to control dc devices that have a moderate current load, such as solenoids, solenoid valves, dc motors, stepper motors, lights, horns, heaters, and fans.
Number of Channels
8
Supply Voltage Range
8 to 26 Vdc
Operating Voltage
12 Vdc
Logic Current Drain (@ 12 Vdc)
15 mA

(quiescent)

2.5 mA per active LED

(manual or auto)

Toggle Switch
MANUAL, OFF, AUTO
Individual dip switches for manual
Maximum Current
1 A

(per channel)

6 A

(all channels total)

Actuation/Release Times
8 μs/200 μs
Operating Temperature
-40° to +70°C
Dimensions
11.1 x 8.6 x 2.4 cm

(4.4 x 3.4 x 0.9 in.)

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Compatibility

Data Logger Considerations

Up to 15 SDM devices can be connected to a single data logger. To communicate with connected SDM devices, the CR3000 and CR5000 use the SDM-C1, SDM-C2, and SDM-C3 ports. The other data loggers use ports labeled C1, C2, and C3. The 21X also requires channel 1H.

Power Considerations

The SDM-CD8S power requirements may be large compared to most Campbell Scientific products. For most applications, an external power supply is recommended to power the SDM-CD8S.

For some applications, it may be convenient to use the data logger’s sealed-rechargeable battery. If the data logger’s rechargeable batteries are used, the batteries need to be float charged via a wall charger or solar panel. The current available from the wall charger limits the SDM continuous output current. Campbell Scientific does not recommend using the data logger’s alkaline power supply.

Enclosure Considerations

The SDM-CD8S requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. Grommets and screws are provided to attach the flanges/bracket to the backplate of our enclosures.

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