background image

 

36

Six character Value ASCII string: 

Type 

Channel 

First 

Last 

Read FC

Write FC Notes 

ASCII 

Value 1 40577 

40579 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 2 40580 

40582 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 3 40583 

40585 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 4 40586 

40588 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 5 40589 

40591 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 6 40592 

40594 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 7 40595 

40597 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 8 40598 

40600 3  n/a 

characters per register; 3 registers per channel 

ASCII 

Value 9 40601 

40603 3  n/a 

characters per register; 3 registers per channel 

ASCII Value 

10 

40604 

40606 

n/a 

2 characters per register; 3 registers per channel 

ASCII Value 

11 

40607 

40609 

n/a 

2 characters per register; 3 registers per channel 

ASCII Value 

12 

40610 

40612 

n/a 

2 characters per register; 3 registers per channel 

ASCII Value 

13 

40613 

40615 

n/a 

2 characters per register; 3 registers per channel 

ASCII Value 

14 

40616 

40618 

n/a 

2 characters per register; 3 registers per channel 

ASCII Value 

15 

40619 

40621 

n/a 

2 characters per register; 3 registers per channel 

ASCII Value 

16 

40622 

40624 

n/a 

2 characters per register; 3 registers per channel 

Memory Floating Point: 

Notes: Returned as 15 bit 2s complement with +- 5% over/under range applied..  Therefore, this 

must be considered when scaling values to be displayed at the modbus master.  The following 

equation may be used to determine a value for display. 

 

Display Value = MODBUS Value [ (Span Value -Zero Value) 1.1]  +  {Zero Value - [(Span Value - Zero Value) .05]}  

32767

 

 

Type 

Channel 

First 

Last 

Read FC

Write FC Notes 

Channel Value 

1-16 

33001-16 

n/a 

n/a 

15bit 2s complement w/+- 5% over/under range 

 
Analog Output: 
Notes:  

12 bit integer for Channel Reading value = 800 counts = zero value, 4000 counts = 100% value. 

Type 

Channel 

First 

Last 

Read FC

Write FC Notes 

Channel 
Reading 

1-16 31001 31016  4 

n/a 

12bit 

integer 

 
Channel Status words contain configuration and status bits for a channel.  They are as follows: 

Type 

Channel 

First 

Last 

Read FC

Write FC Notes 

Channel Status 

1-16 

31017 

31032 

n/a 

16bit integer (see bit by bit definition below) 

 
 

Alarm 1 Trip 

 

 

 

bit0   

1 = Low   

 

 

 

0 = High 

 

Alarm 1 Horn Drive   

 

bit1   

1 = On 

 

 

 

 

0 = Off 

 Alarm 

Type 

   bit2 

 1 

Level 

    0 

Fault 

 

Alarm 2 Horn Drive   

 

bit3   

1 = On 

 

 

 

 

0 = Off 

 

Linearize   

 

 

 

bit4   

1 = On 

 

 

 

 

0 = Off 

 

Alarm 3 Trip 

 

 

 

bit5   

1 = Low   

 

 

 

0 = High 

 Input 

Marker 

   bit6 

 1 

Input 

Marker

 Detected  

0 = Normal Mode 

 Channel 

Disable   bit7 

 1 

Disabled 

   0 

Enabled 

 Controller 

Channel 

In Cal

 

 bit8 

 1 

Local 

Cal 

Mode 

  0 

Normal 

Mode 

 Modbus 

Data 

Type 

  bit9 

 1 

byte 

float 

   0 

byte 

integer 

 

reserved

   

 

 

 

bit10  

reserved

   

 

 

 

reserved

 

 

reserved

   

 

 

 

bit11  

reserved

   

 

 

 

reserved

 

 Alarm 

Latch 

   bit12 

 1 

Latching 

   0 

Non 

latching 

 Alarm 

Latch 

   bit13 

 1 

Latching 

   0 

Non 

latching 

 Alarm 

Latch 

   bit14 

 1 

Latching 

   0 

Non 

latching 

 

Alarm 2 Trip 

 

 

 

bit15  

1 = Low   

 

 

 

0 = High 

Содержание C1

Страница 1: ... 2980 409 927 4180 Fax www gdscorp com INSTRUCTION MANUAL MODEL C1 PROTECTOR 8 16 CHANNEL CONTROLLER Revision 4 6 Firmware 6 03 later including Wireless Setup Warning Read understand contents of this manual prior to operation Failure to do so could result in serious injury or death ...

Страница 2: ......

Страница 3: ...CHANNEL CONFIGURATION MENUS 7 2 2 1 CHANNEL SETUP ENTRY MENU 8 2 2 2 ALARM 1 ALARM 2 HORN RELAY SET UP MENU 8 2 2 3 ALARM 3 FAULT ALARM MENU 9 2 2 4 DATA FROM MENU TO SET INPUT SOURCE 9 2 2 4a MIN MAX RAW COUNTS MENUS 10 2 2 4b MARKER MENUS 11 2 2 4c SENSOR LIFE DETECTION 11 2 2 5 LINEARIZATION MENU 12 2 2 6 CONFIGURE MENU 12 2 2 6a EUNITS MEASUREMENT NAME ASCII DATA FIELDS 13 2 2 6b INPUT MEASURE...

Страница 4: ... 35 5 1 MODBUS SLAVE REGISTER LOCATIONS 35 SECTION 6 39 6 1 C1PM PANEL RACK MOUNT ENCLOSURE 39 6 2 C1N4 NEMA 4X WALL MOUNT FIBERGLASS ENCLOSURE 40 6 3 C1SS NEMA 4X WALL MT 316 STAINLESS STEEL ENCLOSURE 42 6 4 C1XP NEMA 7 EXPLOSION PROOF WALL MOUNT ENCLOSURE 42 6 5 C1 MAIN I O OPTION PCB FOOTPRINT DIMENSIONS 43 SECTION 7 45 7 0 ADDING THE 10 0288 RADIO MODEM WIRELESS OPTION 45 7 1 10 0288 RADIO SET...

Страница 5: ......

Страница 6: ...TO BE NON HAZARDOUS WARNING EXPLOSION HAZARD DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON HAZARDOUS Use a properly rated CERTIFIED AC power mains cable installed as per local or national codes A certified AC power mains disconnect or circuit breaker should be mounted near the controller and installed following applicable local and national codes If ...

Страница 7: ... added to the addressable I2 C bus Option boards have 8 channels and therefore require 2 boards for 16 channel applications In addition to traditional analog and serial methods of providing monitored values the C1 is also capable of sending and receiving wireless data as described in section 7 of this manual A 240 x 128 pixel graphic LCD readout displays monitored data as bar graphs trends and eng...

Страница 8: ...eld on the top right indicates number of seconds remaining in the current 6 minute subinterval 1 1 2 BAR GRAPHS SCREEN The C1 Bar Graphs screen shown in Figure 2 0 allows all active channels to be viewed simultaneously Both engineering units values and bar graph values are indicated in real time Lines across the bars indicate the alarm trip points making it easy to identify channels at or near ala...

Страница 9: ...AC 3 2A max 220 240VAC 1 6A max A slide switch on the front of the power supply selects AC input range The 10 0172 150 watt power supply Figure 3 8 is for powering the C1 and up to 16 detectors A minimum of 5 watts per channel is available for powering of external transmitters 1 2 2 RELAYS Common relays are standard and menus provide voting logic for ALARM 1 ALARM 2 FAULT and HORN Discrete relays ...

Страница 10: ... for operator interface to configuration menus They are shown below in Figure 2 0 The Bar Graphs screen allows viewing of all active channels simultaneously The Trend screen displays a 24 hour trend one channel at a time The Combination screen displays a bar graph large engineering units and a 30 minute trend one channel at a time Input channels may be displayed in sequence with the UP DOWN keys T...

Страница 11: ...r controlled by the UP DOWN keys indicates the selected variable Some are simple YES NO or ON OFF entries toggled by pressing the EDIT key Others such as Measurement Name and Eunits fields may have many ASCII character possibilities Allowed ASCII characters are as follows ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz blank space 0123456789 EDIT places a cursor over the item and UP DOWN scro...

Страница 12: ...6 7 2 2 CHANNEL CONFIGURATION MENUS Figure 2 1 illustrates the menu tree for configuring Channel variables These items affect only the specific channel selected System specific variables are in the menu tree shown in section 2 3 Figure 2 1 ...

Страница 13: ...s TRIP ON is set to HIGH for increasing alarms or LOW for decreasing alarms to determine if the alarm activates upon exceeding or falling below the setpoint The ON DELAY OFF DELAY entries allow ON and OFF time delays affecting how long the setpoint must be surpassed before an alarm event transition occurs ON delays are limited to 10 seconds while OFF delays may be as long as 120 minutes Delays are...

Страница 14: ...he discrete alarms trip as the input exceeds a level then the 10 Fault setpoint must be entered first Toggle the TYPE menu entry to FAULT and enter 10 00 into the setpoint entry Next toggle the menu back to LEVEL and enter the desired Alarm 3 level setpoint The 10 Fault value is retained in memory even though it no longer appears on the menu Figure 2 3 2 2 4 DATA FROM MENU TO SET INPUT SOURCE Chan...

Страница 15: ... that provide Measurement Range read out values described in section 2 2 6b This menu entry is determined by the A D converter resolution of the channel s input For example if the input is a 10 bit Modbus device with zero at 200 counts and 100 at 1000 counts then this menu s MIN should be set at 200 and MAX at 1000 If communicating with the C1 s optional 12 bit Analog Input PCB the MIN should be 8...

Страница 16: ... scale detects a marker value of 1 5mA 1 5mA is 15 62 of full scale when 4 20mA is the range The Mark As menu allows user entry of the 6 digit ASCII message to be displayed when the marker is detected Figure 2 5 2 2 4c SENSOR LIFE DETECTION Sensor Life should only be activated when the Marker event is Calibration and when a sensor life value is transmitted after each calibration This feature is pr...

Страница 17: ... 0 0 6 0 0 0 7 0 0 0 8 0 0 0 9 0 0 0 10 0 0 2 0 0 0 3 0 0 0 4 0 0 0 5 0 0 0 6 0 0 0 7 0 0 0 8 0 0 0 9 0 0 0 A l a r m 1 A l a r m 2 A l a r m 3 Da t a F r o m Ca l i b r a t e L i n e a r i z e C o n f i g u r e Figure 2 7 2 2 6 CONFIGURE MENU From the entry level setup menu in Figure 2 8 the CONFIGURE menu may be entered for setting variables defining how the controller presents monitored data to...

Страница 18: ... highest resolution allowed by this menu s decimal point entry For example if three decimal points are entered and the range is 0 to 100ppm the reading will be 0 000 at 0ppm and 100 0 at 100ppm However this may be undesirable due to the high resolution at zero unless the sensor s output is extremely stable If decimal points are limited to one the 0ppm reading becomes 0 0 and the 100ppm reading rem...

Страница 19: ...l calibrations are reset by the Unity Gain menu item Unity Gain resets zero offset to 0 and span gain to 1 It is useful for returning the calibration to a known starting place Sensor aging may be monitored by recording zero and span readings at Unity Gain when it is new and again at later dates when degradation may have occurred To check zero calibration apply the ZERO calibration value to the sen...

Страница 20: ...ure 2 10 System menus are accessed by pointing to the desired item and pressing EDIT Figure 2 10 2 3 1 COMMON ALARM RELAYS 1 2 READ THIS SECTION CAREFULLY AND TEST ALL SETTINGS BY SIMULATING C1 INPUT CONDITIONS THAT SHOULD ACTIVATE THESE ALARM RELAYS Common Relay 1 Common Relay 2 menus are identical and therefore discussed only once It is very important to fully understand these menus since they d...

Страница 21: ...n relay 1 common relay 2 Default settings for common relay 1 are A1 Votes 01 and A2 Votes 00 which causes relay 1 to trip if any channel has an A1 level alarm active Default settings for common relay 2 are A1 Votes 00 and A2 Votes 01 which causes relay 2 to trip if any channel has an A2 level alarm active Example If either default setting is modified such that A1 Votes 02 and A2 Votes 01 then any ...

Страница 22: ...is similar to the common A1 A2 common relays Figure 2 13 Turning Piezo Alarm ON causes the audible piezo to duplicate the action of the horn relay This feature may be used to provide a low decibel indication of the status of the system s horn Alarm 1 Alarm 2 menus control how this alarm level from each channel will affect the common horn relay Choices are OFF ON or BEEP one Hz Pulsating As an exam...

Страница 23: ...ur before a communication error is indicated This item is useful for optimizing throughput to the C1 from other slave RTU s Poll Rate sets frequency of data requests to the RTU s in milliseconds This is useful when an RTU is limited in how fast it may respond to consecutive data requests The Echo ACK echo acknowledge menu allows alarm reset alarm acknowledge functions be sent from the modbus maste...

Страница 24: ... PCB and do not pay for I O hardware for 16 channels If more than 8 channels are needed a second I O option PCB may be required Figure 2 15 2 3 6 SENSOR INFORMATION Sensor Info is available when at least one channel has Sensor Life activated in the Marker menu see section 2 2 4b The Sensor Info screen displays each channel s sensor status as illustrated in Figure 2 16 Channels with Sensor Life dis...

Страница 25: ... lost it may be displayed briefly at power up using the following procedure Remove power from the controller Reapply power and as the alarm LED s begin scrolling down hold the following keys simultaneously UP DOWN NEXT EDIT Watch closely The 4 digit authorization code appears briefly at bottom left of the screen IMPORTANT DO NOT hold the keys before applying power since this causes a cold boot and...

Страница 26: ...able connects the I O PCB to the C1 CPU and Display nest assembly Two I2 C bus connectors allow addition of optional functions such as analog I O and discrete alarm relays for each channel Horizontal jumpers installed in JP1 connect the RS 485 port s RX TX lines simplifying 2 wire daisy chains by providing additional terminals for incoming and outgoing cables For example installing the 2 COM 1 jum...

Страница 27: ...ND A L A R M2 R e l a y 1 8 F OUND A L A RM2 I NP U T 9 16 F OUN D Figure 3 2 3 1 1 OPTIONAL ANALOG INPUT PCB 10 0158 Many transmitters or sensors have analog output signals and the 12 bit Analog Input PCB shown in Figure 3 3 is available to accept these TB1 with 24 positions offers 3 terminals per channel for distributing power and receiving analog inputs These are EXC and HI LO inputs TB2 with o...

Страница 28: ...D 0010 1115 ASSY 10 0158 J2 J1 J1 J2 are interchangable I2C connectors used to add option PCB assemblies to the ST 71 JP1 determines if this 8 channel Analog Input PCB provides inputs for CH s 1 8 or 9 16 2 PCB assemblies are required for 16 channels Socketed precision resistors R1 R8 are 100 ohm terminations for 4 20mA inputs 0 2 VDC voltage inputs may be accepted by removing resistor TB2 is for ...

Страница 29: ...ection 3 0 and do not require discrete relays for each of the 48 alarm events 16 A1 s 16 A2 s 16 A3 s If discrete relays are needed for all 48 alarms then six PCB s are required 5 VDC power to the discrete relay option PCB s is normally supplied from the C1 Controller via the slender I2 C cables connected to J2 and J3 However I2 C cables are limited in ability to carry this power further than a fe...

Страница 30: ... See chart S1 S1 2 Ch9 16 A1 S1 3 Ch9 16 A2 S1 4 Ch9 16 A3 S1 5 Ch1 8 A1 S1 6 Ch1 8 A2 S1 7 Ch1 8 A3 8 CH CHART Wire TO CPU 5VDC if 5 from controller Install vertically to create Ch zones Standard configuration has a 1 minute POWER ON time delay preventing relay actuation during the delay SB1 increases delay time to 8 minutes SB2 removes all time delay Figure 3 4 3 1 3 OPTIONAL BRIDGE SENSOR INPUT...

Страница 31: ...commended the Voltage Adjust potentiometer screws be covered by a dollop of RTV or similar material after completion of this procedure to avoid accidental over voltage conditions 2 Remove system power and connect sensor wires to the R C A terminals Reapply system power and confirm correct voltage across each sensor s A R terminals Note If sensor wires are long it may be necessary to measure the ex...

Страница 32: ...ATBEAD Sensor Option 10 0191 10 0192 10 0192 10 0191 5 1 3 Internal controller ckts Sensor wiring Ch 1 shown For 4 20mA inputs use 3 5 and do not install 10 0192 module Ch 1 Ch 9 Typical REF ANA LEL Sensor Plug In 100 ohm R Install only if channel is 4 20mA input R1 Figure 3 5 3 1 5 OPTIONAL RTD 4 20mA ANALOG INPUT BOARD 10 0170 An optional 12 bit RTD Sensor Input board shown in Figure 3 6 allows ...

Страница 33: ...water is an acceptable method for generating the 0 C zero temperature value Upscale span values are best simulated with an RTD calibrator Since RTD s are stable and repeatable of over long time periods calibrations normally only need to be performed upon initial installation Since the PCB has 8 channels two are required for 16 channel applications JP25 configures inputs for channel groups 1 8 or 9...

Страница 34: ...1 Since the PCB has 8 channels two are required for 16 channel applications JP1 configures the outputs for channels groups 1 8 or 9 16 TB1 Q4 Q6 Q2 Q10 Q12 Q8 D2 Q16 Q14 HI HI HI HI HI HI HI HI U11 ST 71 mA OUTPUT BOARD Q1 LO LO LO LO LO LO LO LO Q5 Q3 Q7 PCB 0010 1121 Assy 10 0167 C3 High s Milliamp Low s Outputs Rev 0 CR1 C6 R26 C7 U9 Q13 Q11 Q9 C4 C1 J2 C2 J1 D1 U8 Q15 U10 TP1 Q17 J1 J2 are int...

Страница 35: ... bits no parity one stop bit and FlowControl Hardware Printer diagnostic red LED s indicate printer faults such as out of paper overflowed buffer or loss of communications Green LEDs flicker to confirm good communications between the C1 and printer during print attempts Examples of printed alarm events are shown below The format of each event from left to right is DATE TIME 16 character ASCII chan...

Страница 36: ...enu entries allow setting of correct local time and date The ALARM PRINT ON OFF entry allows printing to be discontinued if turned to OFF PORT allows selection of RS 232 RS 422 or the parallel port With only one port able to be activated at a time BUFFER DUMP allows immediate printing of all the 30 35 stored events PRINT CONFIG allows immediate printing of all channel variables such as channel ID ...

Страница 37: ...may be connected by the end user Figure 3 8 SECTION 4 4 0 SYSTEM DIAGNOSTICS A System Diagnostic Mode shown in Figures 4 1 and 4 2 may be entered during normal operation from the Setup menu The entry menu indicates firmware revision and offers useful routines for testing front panel LED s relays serial ports and analog I O It is exited manually by pressing NEXT and automatically if no keys are pre...

Страница 38: ...C1 Controller Users Manual Revision 4 6 33 can prove invaluable when testing I O since relays and analog outputs may be stimulated without driving inputs to precise levels Figure 4 1 ...

Страница 39: ...34 Figure 4 2 ...

Страница 40: ...hannel Tag 12 40489 40496 3 n a 2 characters per register Channel Tag 13 40497 40504 3 n a 2 characters per register Channel Tag 14 40505 40512 3 n a 2 characters per register Channel Tag 15 40513 40520 3 n a 2 characters per register Channel Tag 16 40521 40528 3 n a 2 characters per register Six character Eunits Tag Type Channel First Last Read FC Write FC Notes EUNITS 1 40529 40531 3 n a 2 chara...

Страница 41: ...ister 3 registers per channel Memory Floating Point Notes Returned as 15 bit 2s complement with 5 over under range applied Therefore this must be considered when scaling values to be displayed at the modbus master The following equation may be used to determine a value for display Display Value MODBUS Value Span Value Zero Value 1 1 Zero Value Span Value Zero Value 05 32767 Type Channel First Last...

Страница 42: ...ger Common LED Status 1 16 31052 n a 4 n a packed 16bit integer LCD Display Screen Displayed Integer Type Channel First Last Read FC Write FC Notes LCD Screen n a 31053 n a 4 n a 8bit integer Sensor Life Type Channel First Last Read FC Write FC Notes Sensor Life 1 31065 n a 4 n a Signed 16bit integer Sensor Life 2 31066 n a 4 n a Signed 16bit integer Sensor Life 3 31067 n a 4 n a Signed 16bit inte...

Страница 43: ... 16 41161 76 n a 3 n a alarm 3 real w o decimal point Fault DP 1 16 41177 92 n a 3 n a alarm 3 real divisor 24 Hour Trend Database The 24 hour MAX MIN and AVERAGE trend data may be retrieved over the Modbus serial interface Each channel consists of 240 MAX MIN and AVERAGE values or one value for every 1 10 hour 6 minutes Since there are 16 channels this database equals 3 840 registers in addresses...

Страница 44: ...CB s such as analog input or discrete relays may be mounted directly to the back of the enclosure Additional 8 channel I O option PCB s must be located external from the assembly on another mounting plate A 3 foot length of I2 C cable is also supplied for this purpose Weight is approximately 7 pounds Properly ground the enclosure and follow national and local electrical codes RACK PANEL MOUNT 19 R...

Страница 45: ...unted weather deflector shield is recommended Weight is approximately 17 pounds Figure 6 3 provides important warning information concerning correct grounding procedures for non metallic enclosures Conduit entries are not provided so installers may place entries as needed Bottom or lower side areas are recommended Care must be taken to avoid drilling into circuit boards mounted inside the enclosur...

Страница 46: ...C1 Controller Users Manual Revision 4 6 41 Figure 6 3 ...

Страница 47: ...Conduit entries are not provided so installers may place entries as needed Bottom or lower side areas are recommended Care must be taken to avoid drilling into circuit boards mounted inside the enclosure Properly ground the enclosure and follow national and local electrical codes Figure 6 4 6 4 C1XP NEMA 7 EXPLOSION PROOF WALL MOUNT ENCLOSURE The C1XP shown in Figure 6 5 is an aluminum NEMA 4X 7 w...

Страница 48: ...discrete relays printer interface and others All C1 enclosure styles require the Main I O PCB Figure 3 1 but also support the mounting of additional option PCB s as described below C1PM Panel Rack Mount supports 2 option positions as standard and 4 more with the 10 0180 expansion plate since in panel rack mount installations 10 0180 s must be mounted in user space behind panels or inside racks mul...

Страница 49: ...44 Figure 6 6 ...

Страница 50: ...ach transceiver on a wireless network must have their RADIO SETUP menus configured to share the same hopping channel 0 32 and System ID 0 255 to communicate All R C Systems wireless transceivers utilize a Server Client network where Clients synchronize their hopping to the Server The Server transmits a beacon at the beginning of every hop 50 times per second Client transceivers listen for this bea...

Страница 51: ...CEIVER MODE Wireless Receiver mode is exclusively for wireless communication to our GASMAX ECX wireless sensor transmitters please visit GASMAX ECX In Receiver mode the 10 0288 radio connects to the C1 s master port and receives input data from up to sixteen GASMAX ECX sensor transmitters Wired and wireless inputs may be mixed between the C1 s sixteen channels so it is possible to also accept wire...

Страница 52: ...it each 5 minutes so the arrow should never progress past the 5 minutes interval The C1 activates the channel s FAULT alarm and indicates ComErr if no transmission has been received in 18 consecutive minutes Low Battery status indicates the GASMAX ECX s integral 3 6V lithium D cell part 10 0293 has dropped to below 3 3V and should be replaced very soon LoBatt is indicated on the C1 s LCD readout a...

Страница 53: ... settings The difference is each Channel s INPUT DATA FROM menu must be configured with the correct MODBUS values to match the slave device instead of Wireless RF900 Wired and wireless inputs may be mixed between the C1 s sixteen channels so it is also possible to accept wired signals from analog input option PCB s described in section 3 1 This is a popular application when the modbus slave is ano...

Страница 54: ... In this case as the omni directional antenna will be mounted with vertical polarity then the Yagi s must also have vertical polarity Care needs to be taken to ensure the Yagi is aligned correctly to achieve optimum performance Two Yagis can be used for a point to to link In this case they can be mounted with the elements horizontally to give horizontal polarity There is a large degree of RF isola...

Страница 55: ...oor conductivity Solid connection means a large capacity conductor not a small wire with no coils or sharp bends All other devices connected to the C1 need to be grounded to the same ground point There can be significant resistance between different ground points leading to very large voltage differences during lightning activity As many wireless units are damaged by earth potential surges due to ...

Страница 56: ...her equipment Surges can enter the wireless unit from connected devices via 1 O serial or Ethernet connections Other data devices connected to the wireless unit should be well grounded to the same ground point as the wireless unit Special care needs to be taken where the connected data device is remote from the wireless unit requiring a long data cable As the data device and the wireless unit cann...

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