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Data Delivery Devices RFScada 2DI-4DO Long Range Spread Spectrum Bi-Directional Wireless Telemetry Unit User Manual
Data Delivery Devices RFScada 2DI-4DO Long Range Spread Spectrum Bi-Directional Wireless Telemetry Unit User Manual
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RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 11 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328
installation, the cabinets may be supplied without any holes and the customer may drill
the cabinet then install the cable clamps in a suitable position. Use caution when drilling
the cabinet and always ensure that any power is removed from the device beforehand,
otherwise damage to the device and serious injury may occur.
Before drilling the cabinet it is usually best to remove the main internal panel that
holds the circuit board, battery and internal antenna to prevent damage to the device.
To do this carefully remove the 4 stainless steel screws that mount the main panel to
the cabinet. Use caution removing these since the screw threads have been treated
with low strength thread locker to prevent coming loose from vibration.
NOTE
Be especially careful by the antenna, it is securely located to
both the board via a precision connector and to the panel via
a non metallic stand, do not attempt to lift the panel by the
antenna since damage to the main board and antenna will
result.
Once the panel has been removed from the cabinet, drill holes large enough
(commonly available ‘step’ drills are very useful for these size holes) for the cable
clamps or conduit fittings and install the clamps tightly. Remove any dust or particles
remaining from drilling, then replace the panel in the cabinet and complete wiring of the
inputs, outputs and power to the device. Secure power and signal cables to the inside of
the case using Ty-Wraps included with the unit. Close the front door and secure with a
suitable padlock (latch close version) or by tightening the door closing screws (screw
close version).
Possibly lethal line voltages will be present on
the unit’s circuit board when connected to AC
line power. Before attempting to gain access,
test or modify connections refer to a qualified
electrician for assistance, instructions on safe
operation and to ensure that connections meet
all applicable safety procedures, standards and
codes. The front door should always be
securely closed either by using a suitable
padlock (latch close version) or by tightening
the door closing screws (screw close version)
to prevent access by unauthorized personnel.
Apply power to the unit and verify correct operation.
DANGER
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 12 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 Typical Wiring Installation Component Identification, Signal and Wiring Reference.
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 13 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 Component Identification This diagram identifies components, connectors and LED’s on the RFScada board assembly. Refer to the following chart and detailed notes for an explanation of items identified.
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 14 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 Connector Pin Function J1 1 117 VAC Line Hot AC power in J1 2 Ground In J1 3 117 VAC Line Neutral AC power in J2 1 External 12 Volt DC input positive J2 2 External 12 Volt DC input negative (connected to ground) J3 1 Local contact input One (5 Volt DC via 1 K Ohm pull up resistor) J3 2 Local contact input One (connected to ground) J3 3 Local contact input Two (5 Volt DC via 1 K Ohm pull up resistor) J3 4 Local contact input Two (connected to ground) J4 1 Remote relay one contact normally closed J4 2 Remote relay one contact common J4 3 Remote relay one contact normally open J4 4 Remote relay two contact normally closed J4 5 Remote relay two contact common J4 6 Remote relay two contact normally open J5 1 Remote AC relay status contact J5 2 Remote AC relay status contact J5 3 Comms OK status relay contact J5 4 Comms OK status relay contact J6 1 12 Volt battery Positive J6 2 12 Volt Battery Negative (connected to ground) All signals are identified by the preceding diagram and chart. Note that not all the connections need to be used; these will vary depending on the application. J1, AC Line Input This is 115 VAC line power and ground connection to the unit. The non-metallic enclosure does not provide grounding from any conduit connections. Use grounding type bushings and jumper wires if metal conduit is used. If the RFScada unit is operating from an external DC supply this connecter may not be used. J2, External 12 Volt DC Input This is the low voltage input power connector, and if used is connected to a 10 to 18 Volts DC external power source (NOT the backup battery in the RFScada case). Note that pin 2 is connected to ground on the circuit board and is common to all the other CAUTION
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 15 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 pins that connect to ground. If an external ground is not connected via the 115 VAC power connector (J1), then an external ground should be connected to this pin. The non-metallic enclosure does not provide grounding from any conduit connections. Use grounding type bushings and jumper wires if metal conduit is used. J3, Local Contact Inputs The switch contacts whose status is to be transmitted to the opposite unit are connected here. Shorting together pins 1 and 2 on J3 will cause the output relay one at the remote RFScada unit to activate; shorting together pins 3 and 4 on J3 will cause the output relay two at the remote RFScada unit to activate. Pins 1 &3 are both connected to 5 volts DC via a 1 K Ohm pull up resistor; pins 2 & 4 are connected to ground. An external set of dry contacts will short the inputs to activate the signals, alternatively an external open collector transistor may also be used to activate the signal is required. In this case the external transistor would need to be able to sink 5 mA. Under no circumstances should any external voltage be applied to the pins on J3. Local Input Status LED’s These two green LED’s indicate the present status of each local input at J3. They are illuminated when the external input contacts are closed and the signal de-bounce delay time has completed, so these LED’s will respond just after changes in the input signals have occurred. J4, Remote Relay Contacts J4 is connected to the contacts of two independent single-pole double-throw relays, which respond to signals applied at the other RFScada unit. Relay one contacts are activated in response to the switch contacts at the other RFScada unit input one, and relay two contacts respond to the switch contacts at the other RFScada unit input two. Each relay contact is rated at 0.5 Amp 115 VAC, or 1 Amp at 30 V DC. If loads greater than this are to be controlled a suitable larger capacity relay should be driven from this one. The common, normally open and normally closed contacts for each relay are all available at connector J4, but if possible the user should configure the system to use ‘normally open’ type configuration to ensure failsafe operation. Then in the event of a signal wire being damaged, communication signal loss or other failure a suitable alarm or course of action may be undertaken. Remote Relay Status LED’s These two red LED’s indicate the present status of each remote relay (connected to J4). They are illuminated when the relays are activated, ie the normally open contacts are closed. These LED’s are driven form a spare set of contacts on each relay, so they indicate the actual present status of the two relays. J5, Remote Status Output Contacts CAUTION
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 16 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 J5 is connected to the contacts of two independent single-pole single-throw relays, which respond to signals at the other RFScada unit. Pins 1 & 2 will be shorted together by the relay contacts whenever AC line power is powering the other RFScada unit, when AC power is not powering the other unit the relay contacts will open. The contacts will close when the AC voltage is above approximately 95 VAC and open when it is below about 90 VAC. If the other unit is being powered by an external 12 Volt DC source the contacts will be open. Pins 3 & 4 are connected to another set of relay contacts, which are activated when good, verified communications are in process between this RFScada unit and the other RFScada unit. The contacts will open within a few seconds when communications fail for any reason. Each relay contact is rated at 0.5 Amp 115 VAC, or 1 Amp at 30 V DC. If loads greater than this are to be controlled a suitable larger capacity relay could be driven from these. Remote Status LED’s These two yellow LED’s indicate the present status of the remote units AC power and the present state of communications between units. They are illuminated when the two relays (connected to J5) are activated, i.e. the normally open contacts are closed. These LED’s are driven from a spare set of contacts on each relay, so they indicate the actual present status of the relays. Transmit / Receive LED’s These two LED’s (red receive, green transmit) illuminate each time the unit completes a data transmission or verified data reception. Normally the two LED’s will be flashing in sequence as the unit communicates with another. If the unit is unable to receive data it will flash just the transmit LED each time it tries to establish communication. These two LED’s give a quick indication of communications, and are very useful in the case of marginal data communications or antenna adjustments. J6, Backup Battery Connector This is connected to the 12 Volt DC sealed lead acid backup battery. It supplies power to the RFScada device when AC line power or an external 12 Volt DC power supply fails; then the unit may continue to operate and draw power from the battery via this connector. Pin 1 is the positive battery connector, and pin 2 (connected to ground) goes to the negative battery connector. The board has a built in, temperature compensated, current limited float charger for the external battery. This charger is designed to safely charge the standard battery and then keep it continually charged in a ‘float’ mode. This charging circuit is protected against reverse polarity, open circuit, a dead or shorted battery, over-current in or out of the board and also has an electrically re-settable fuse. Under no circumstances should any other voltage or device be connected to these pins, the charging circuit is not designed to operate with any other type of battery. If an external DC voltage (such as a solar panel, car battery or charging system) is required to operate the RFScada unit, then connect the external voltage to connector J2. If the backup battery is not required remove it from the RFScada cabinet and unplug the connector P6 from connector J6.
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 17 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 Antenna Connector The internal antenna is normally attached to this connector. If another antenna needs to be used then the internal antenna should be carefully disconnected and removed. See the section on external antennas for more details. F1, AC Power Fuse A user replaceable fuse and a transient arresting MOV protect the board. The fuse will blow if there is a malfunction in the circuit, or a voltage greater than the board rating is applied to the AC line input. The fuse is located underneath a safety cover, which in turn is secured by a Ty-Wrap. To test and replace the fuse proceed as follows: Possibly lethal line voltages will be present on the unit’s circuit board when connected to AC line power. Before attempting to gain access, test or modify connections refer to a qualified electrician for assistance, instructions on safe operation and to ensure that connections meet all applicable safety procedures, standards and codes. First remove all AC power to the unit. Cut and remove the Ty-Wrap that secures the fuse safety cover. Remove the safety cover. Using an Ohm Meter measure the resistance of the fuse, if the resistance is high or infinite the fuse has failed and needs to be replaced. If it has failed discard and replace with a spare 2 Amp 250 V that is supplied with the unit. Do not use a fuse with any other rating. Replace the fuse safety cover and secure with a Ty-Wrap included with the unit. To check the fuse and AC operation the 12 Volt battery cable plug P6 may be unplugged from connector J6 before re-applying AC line voltage. If the unit does not power up correctly please contact Data Delivery Devices LLC for assistance. Once correct operation has been verified the battery (if installed) should be re-connected. Battery Maintenance and Replacement. The standard 12 Volt DC 1.2 Amp / hr battery has a limited lifetime, typically between 2 to 5 years but it will vary depending on the environment and type of use. NOTE The battery life will be severely limited if it is left in a completely discharged state. If the RFScada unit is not going to be used for some time and will not have AC power applied then unplug the battery cable plug P6 to prevent the battery from becoming completely discharged. The battery will continue to maintain a charge for a year or more without requiring charging provided there is no load, so unplug it if the unit will not be used. DANGER
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 18 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 The battery condition may be verified periodically by simply removing the normal source of power (AC line or low voltage DC). The RFScada unit should continue to operate for at least 6 hours, if it does not then replace the battery. Acceptable replacement types are Power-Sonic PS-1212 or Panasonic LC-R121R3PU. To replace the battery proceed as follows: Some manufacturers of the sealed, rechargeable batteries that may be used in the RFScada unit do not recommend charging the batteries in a hermetically sealed enclosure. Although the batteries themselves are completely sealed and may be operated at any angle it may be possible, under a certain set of rare circumstances for the battery to vent gas into the cabinet. This gas could potentially create an explosion if subsequently ignited by a spark. The battery could possibly vent gas if the charging circuit malfunctioned, the protective current-limiting fuse shorted out, the battery became severally overcharged and failed. The RFScada unit has a suitable vent in the base of the cabinet, which will allow any gas to safely vent in the event of these failures. If the internal battery is not required the vent may easily be removed and the hole may be used for cable access, since it is the same size as the cable entry fittings supplied. Possibly lethal line voltages will be present on the unit’s circuit board when connected to AC line power. Before attempting to gain access, test or modify connections refer to a qualified electrician for assistance, instructions on safe operation and to ensure that connections meet all applicable safety procedures, standards and codes. DANGER DANGER CAUTION
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 19 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 First remove all AC power to the unit. Unplug the battery cable plug P6 from the board connector J6. Cut and remove Ty-Wrap’s that secure the battery. Carefully pull the old battery away from the panel. Unplug the cable terminals from the old battery, and plug them onto the new battery making sure they are connected red wire to positive (+) on the battery and black wire to negative (-) on the battery. Locate the new battery in position and secure it with three new Ty-Wraps supplied with the replacement battery. Plug the battery cable plug P6 into connector J6 on the board. Return the unit to service and re-apply AC power. After the unit has been back in service for a few hours remove AC power and verify correct operation using the new battery, if it does not operate correctly contact Data Delivery Devices LLC for assistance.
RFScada User Manual Version 1.7 Copyright ©2002 Data Delivery Devices LLC Page - 20 – 120 NE DeBell Suite B Bartlesville OK 74006 Tel 918-335-3318 FAX 918-335-3328 Typical Applications and Installations. Fluid Monitoring / Control Remotely monitor both high and low levels of a tank and control the fill / drain pumps from 20 miles away without interconnecting wires. The RFScada devices also provide automatic local and remote alarms for power or system failures, plus full function operation for hours due to the standard built in battery backup.