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概览
LR4 继电模块非常适用于供电不可靠的场所，或者需要节约供电的情形。LR4并不需要电力来保持继电器闭合。只有通过向LR4发送命令，或者手动切换继电按钮，才能改变继电器的状态。
图像
技术说明
坎贝尔的LR4 4-通道自锁继电模块适用于供电不可靠的场所，或者需要节约供电的情形。不象传统的继电器那样，必须连续供电才能保持它们的状态，LR4机械自锁继电器的状态，允许断开供电。只有通过向LR4发送命令，或者手动切换按钮，才能改变继电器的状态。数据采集器通过SDI-12 协议或ModBusger 协议向LR4 发送命令。
产品规格
| Function | Used in situations with unreliable power or where power needs to be conserved. |
| Number of Channels | 4 |
| Supply Voltage | 9 to 30 Vdc |
| Operating Voltage | 12 Vdc nominal (9 to 30 Vdc) |
| Operating Temperature | -40° to +60°C |
| Relay Type | Latching |
| Maximum Voltage Ratings of Relays | 30 Vdc/30 Vac |
| Dimensions | 17.0 x 3.7 x 6.1 cm (6.7 x 1.5 x 2.4 in.) |
| Weight | 0.48 kg (1.05 lb) |
Power Consumption |
|
| Quiescent | < 2.0 mA |
| Peak | < 250 mA |
Communications |
|
| Hardware | SDI-12, RS-232, RS-485 |
| Protocol | SDI-12 Version 1.3, or ModBus via RS-232/RS-485 at 19,200 bps |
Digital I/O Input Voltage |
|
| Maximum | +20 Vdc |
| Minimum | -12 Vdc |
Relay Contacts |
|
| Relay #1, Relay #2 | Two independent; single pole single throw (SPST) |
| Relay #3, Relay #4 | Two independent; single pole double throw (SPDT) |
Maximum Current |
|
| Relay #1, Relay #2 | Not to exceed 100 VA or 5 A |
| Relay #3, Relay #4 | Not to exceed 60 VA or 2 A |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR10X (retired) | ||
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR23X (retired) | ||
| CR295X (retired) | ||
| CR300 (retired) | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) |
常见问题解答
LR4: 1
-
The following relay devices can be used with the CR800 and the CR850:
- 7321
- A6REL-12*
- A21REL-12
- LR4
- SDM-CD8S
- SDM-CD16AC
- SDM-CD16ACA
- SDM-CD16S
The CR800 and the CR850 can also be used with a wide variety of third-party relay devices.
*Because the CR800 and the CR850 only have four digital ports, they do not have the ability to switch all six of the relays on the A6REL-12.