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Resumen del manual
EXTERNAL CONNECTIONS.................................................................................3 3. POWER SUPPLY...................................................................................................4 4. ANALOGUE OUTPUTS.........................................................................................4 5. RELAY CONTACTS...............................................................................................5 6. GAS DETECTION RANGE....................................................................................5 7. STANDARD DEFAULT SETTINGS.......................................................................6 8. CONNECTIONS AT A GLANCE............................................................................7 At the time of writing, this User Guide accurately describes the product. However, in the course of development of our products we may make changes without notification. Honeywell shall not be liable for errors or for incidental or consequential damages, directly or indirectly, in connection with the furnishing, performance or misuse of this product or document. All Installation and Commissioning work on Honeywell equipment should be carried out by suitably qualified personnel only. Normal safety precautions and good working practice should be observed, to prevent damage or injury at all times. We welcome comments about our products and documentation. Contact us at : Address on back cover of this guide 1. INTRODUCTION The Honeywell Refrigerant Gas Detection sensors, SN0500 (for refrigerant R404a) and SN0501 (for refrigerant R410) are used to detect the leakage of refrigerant gas and notify a monitoring system or provide a local indication (i.e. audible or visual signal). Remedial action can then be taken to stop and replace the lost gas. 2. EXTERNAL CONNECTIONS All external connections are made to the motherboard through a cable gland. A cable tie should be fitted within 20mm of the cable gland inside the enclosure. The connectors will accept wire of 0.5-1.5mm sq. Note: Earth connection must be made when using the vented metal enclosure or Exd enclosure. The safety of this equipment is dependent on the integrity of the power supply and the earthing of the enclosure. On power up the sensor may take some time (minutes up to hours) to fully normalize. You can monitor this by checking the 0-10V output as it falls towards zero. If during this normalisation period the red / yellow LED activates indicating the high / low level relay has switched then the reset button (see Fig. 1.) on the sensor must be pushed (if in latched position) after normalisation is complete. Figure 1. External Connections 3. POWER SUPPLY The Power supply is connected at Con 1 (see Fig. 1) Green LED on - shows power connected. Pin 1 = 0V, Pin 2 = 12 to 24 VAC or 12 to 30VDC, Pin 3 = Earth. The 0V (pin 1) on the power supply terminal block (CON 1) can withstand 50V AC or DC with respect to the 0V (Pin 1) on the output terminal block (CON 3). If this is likely to be exceeded use an isolated power supply. On the power supply side 12V is the minimum voltage at the terminals. Power consumption is 4W max. It can draw 0.33Amp at 12V, so voltage drop along the supply cable should be considered when selecting supply cable, type and length. For example, for cable resistance 10ohm/100m allowing for the flow and return total cable resistance for 100m is 20ohm and voltage drop along the cable is 6.6V. Minimum DC supply then should be 19V. If you need to use a cable of greater diameter that 1.5 mm sq, you can use a terminal block at each sensor position capable of taking the larger cable and connect from that into the CON1 terminal block using 1mm sq wire. Alternatively use local power supplies to reduce cable runs and voltage loss. 4. ANALOGUE OUTPUTS Analogue Outputs which indicate the concentration of gas refrigerant in the air, are at Con 3 (see Figure 1.) A two-core communication cable should be used to connect the outputs to a monitoring and control system; a screen is not required. Pin 1 = 0V Pin 2 = 4-20mA. Load resistance must be less than 400. Pin 3 = 0-10V. Load resistance must be greater than 100. Pin 4 = 0-5 V. Load resistance must be greater than 10K. When connecting the 4-20mA to the control panel, we suggest using Belden 8761, 22awg single pair shielded or alternatively an alarm type cable of 7/0.2mm, 22awg. 5. RELAY CONTACTS Note: If changing any jumper - power must be removed. There are two relays rated up to 1 Amp at 24V DC/AC. The status of the relays is jumper selectable. Relay 1 at Con 6. Low-level alarm. Yellow LED on when in alarm. Normally closed when JP4 link inserted, JP3 link removed, as shown on Fig. 1. Normally open when JP3 link inserted, JP4 link removed, as shown on Fig. 1. Latching (manual reset by push button located next to CON 7) - Not latching (automatic reset) set by JP8 see Fig. 1. for link position. Alarm threshold level is set by pot RV1 and can be set by putting a meter ...