The ABB SPA-ZC21 is a specialized bus connection module designed to interface SPACOM secondary devices with a fiber-optic SPA bus. This unit functions as an electrical-to-optical converter, facilitating communication between substation secondary devices and higher-level monitoring or control systems.
Features
- Standardized SPA to RS-485 conversion
- Supports multiple relay configurations
- Flexible optical interface options for glass or plastic fiber
- Selectable data transfer rates (300 to 19,200 bit/s)
- Integrated DIP switch configuration for master/slave and communication mode selection
Technical Specifications
| Model | SPA-ZC21 |
| Function | Bus connection module |
| Host Interface | 9-pin D-sub male |
| Baud Rate | 300 – 19,200 bit/s |
| Isolation | 1500 V DC |
| Operating Temperature | -25 degC to +70 degC |
| Storage Temperature | -40 degC to +85 degC |
| Humidity | 5 – 95 % RH (non-condensing) |
| Tariff Code | 8537101190 |
Installation Guidelines
- The module is designed to plug directly into the 9-pin D-type subminiature connector on the rear plate of the host SPACOM device.
- Ensure the device is powered down before installation or removal of the module.
- Configure the communication mode (SPA or RS485) and echo checking (Slave/Master) using the front-panel DIP switches prior to commissioning.
- If fiber routing requires adjustment, the internal PCB can be rotated 180 degrees by removing the two cross-slotted screws and reassembling the cover accordingly.
- Handle with standard ESD precautions to prevent damage to internal circuitry.
FAQ
What is the primary function of the SPA-ZC21?
It connects substation secondary devices, such as relays, to a fiber-optic SPA bus system, allowing seamless data transmission between the device and a higher-level system.
What devices is it compatible with?
The module is compatible with any SPACOM device equipped with a 9-pin D-type connector.
Does the module require configuration?
Yes, the module requires configuration via front-panel DIP switches for communication mode (SPA vs RS485) and echo checking (Master/Slave). Additionally, the internal PCB orientation may be adjusted to match specific fiber-optic cable requirements.
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