INSTAL INSTALL L ATION GUIDE GUIDE ISB+
1. Introduction The ISB+ is an ATEX ATEX isolation unit unit for the serial ports RS232/RS485 RS232/RS485 of devices devices installed in hazardous areas. The typical devices for this application in Itron portfolio are : CORUS, SEVC-D, ANGus. It can also provide external power supply for one device in hazardous area. RS232 communication can be converted to RS485 (half duplex) through the ISB+ and vice versa. The ISB+ replaces the previous ISB. The enclosure of the ISB+ is suitable for DIN Rail mounting and provides an IP20 protection level. The ISB+ can be powered by any commercial external power module within 9-24 V range (8 W). 2. Technic Technic al Characteristic Characteristic s
Input voltage voltage : 9 -24 V DC typical (27.5 V DC Max.) Power consumption : 8W Max. Output : 8V DC / 100 mA for material with compatible compatible electrical electrical parameters parameters according ATEX certificate. Input fuse AC : 800 mA T 4000A Output fuse DC : 250mA T half Ambient temperature range : -250 C to +550 C Protection Level : IP 20 Enclosure Serial ports ports for connection connection s to the hazardous hazardous area area : RS232 RS232 or RS485 (2 wires, wires, half duplex), speed 1200 – 38400 bauds, power supply for the serial port of the material in hazardous area. Serial ports ports for connection connection to the safe area : RS232 or RS485 (2 wires, half duplex), speed 1200 – 38400 bauds. Conversion from RS232 RS232 to RS485 possible from each side (hazardous (hazardous and safe safe area) with automatic turn around (same speed).
3. Description The ISB+ can be used to isolate the RS232 and RS485 ports of devices located in hazardous area and to transmit data to the safe area to devices without any approval for intrinsic safety through an RS232 or an RS485 port. Only one of the ports (RS232 or RS485) can be used on each side, meaning that only the RS232 or the RS485 port can be connected to the ISB+ on the hazardous area side and similarly for the safe area side. It’s possible to convert signals from RS232 to RS485 and vice-versa. The RS485 port (on each side) is a two wire port with automatic turn-around management. On the hazardous area side, it’s possible to connect several devices on the RS485 port at the same time, but only if the compatibility of electrical parameters remains
within the range specified in the ATEX approval of the ISB+. The linear capacitance C and inductance L of the cable must be integrated in the calculation for the ATEX compatibility. The power supply output of the ISB+ can be used for any material (only one device can be powered from the output of the ISB+) in the hazardous area, only if its electrical and functional parameters are compatible with the parameters on the ATEX certificate of the ISB+. A green LED LE D indicates the presence of voltage on the power input of the ISB+ and two red LEDs include the activity on Rx and Tx signals of the communication ports. 4. General General system overview and connect ions The typical application of the ISB+ is to connect the Corus RS232 port to material in safe area (computer, RTU,etc...).
WARNI WAR NING NG : Check cabling before powering. Any erro r on c abling of RS RS23 232 2 and RS485 RS4 85 ports cou ld d amage the ISB+. ISB+. Typical cofiguration with a Corus (power supply and RS232 connection) in hazardous area.
Typical Configuration with Several devices connected on the RS485 port in hazardous area
5. Commisioning Inputs/Output Cabling Cabling The catalog of the ISB+ is indicatedon indicatedon its enclosure. The cables must be mechanically fixed so that there is no risk of short circuit between cables coming from the safe area and cables coming from the hazardous area. A minimal distance of 50mm must berespected between those cables.
Installation The ISB+ must be installed in the safe area in a cabinet providing sufficient protection against climatic conditions, including water and dust presence (IP65 level minimum). The cabinet should also protect the ISB+ against the exposure to direct sunlight. For correct mounting the ISB+ must be mounted on DIN rail. ISB+ ISB+ powering The ISB+ accepts any commercial power supply providing 9 to 24V DC regulated voltage with a minimal power of 8W. Our suggestions for the supply module is the TRACO POWER TCL24-11 which can also be mounted on DIN rail, next to the ISB+. The power input of the ISB+ can also be connected to a rechargable battery pack with a solar panel and a charger. In this configuration, the ISB+ can be proposed as a solar power supply unit for the Corus. For more information about this feature, you can contact your local Itron representative.
ISB+ ISB+ speed/switch speed/switch co nfigur ation The ISB+ has two internal switches for speed configuration and for the RS485 chip. In usual conditions, the position of the switches does not need to be modified. To access the switches, the box must be opened with a flat screwdriver. The user must insert the screw driver under the four connection plots and lever them one by one to remove rear part of the box (see picture 1). Once the rear part removed, a screwdriver must be used to gently pull the printed board out of the enclosure. For this operation, the screwdriver must only be used in the corner regions bearing the connectors (as indicated on picture 2). Using a tool elsewhere than in the corner regions may be harmful to the product. A flat cable connects the printed board to the three LEDs card and, therefore, the printed board can’t be completely separated separated from the upper part of the box.
