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C910-485 OPERATION 

Section 4 

4.1 

 

OPERATING MODES 

4.1.1 

 

Four Modes on Console 

Scan  

 

This is the default mode displayed during normal operation. In this mode, the console 
sequentially displays load current, temperature, and setpoint readings. 

Alarm  

 

This mode allows you to examine or reset any alarms that may exist. The LED above the 
ALARM key is illuminated while in this mode. To enter this mode: 

 

 

Monitor    

This mode allows you to examine any of the controller readings such as temperature, 
load current, etc. The LED above the MONITOR key is illuminated while in this mode. To 
active this mode: 

 

 

Configure  

This mode allows you to access the console menus to examine or alter the settings. The 
LED above the CONFIG key is illuminated while in this mode. To access the operational 
menus: 

 

Summary of Contents for C910-485

Page 1: ...nVent com 1 C910 485 Heat Trace Controller INSTALLATION OPERATION AND MAINTENANCE MANUAL Firmware versions up to V4 0X ...

Page 2: ... Low Temperature Alarm Enable Lo TS 1 and Lo TS 2 25 4 2 8 Low Temperature Alarm Setting Lo TS 1 and Lo TS 2 26 4 2 9 High Temperature Alarm Enable Hi TS 1 and Hi TS 2 27 4 2 10 High Temperature Alarm Setting Hi TS 1 and Hi TS 2 28 4 2 11 Temperature Sensor Failure Alarm 29 4 2 12 High Temperature Cut out Setpoint and Alarm HI Limit TS1 HI limitTS2 30 4 2 13 Low Load Current Alarm Enable Lo Load 3...

Page 3: ... Features A detailed description of available features may be found in Section 4 of this manual Highlights of specific features follow Keypad and Alphanumeric Display A six character alphanumeric LED display provides the operator with large easy to read messages and prompts eliminating complex and cryptic programming Six individual keys are provided to quickly access alarming and operational infor...

Page 4: ...ication nVent certifies that this product met its published specifications at the time of shipment from the factory Limited Warranty This nVent product is warranted against defects in material and workmanship for a period of 18 months from the date of installation or 24 months from the date of purchase whichever occurs first During the warranty period nVent will at its option either repair or repl...

Page 5: ...tions Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at their expense This equipment does not exceed Class A limits for radio emissions as set out in Schedule V to VIII of the Radio Interference Regulations of Communication Canada 1 3 PRODUCT SPECIFICATION General Area of use Nonhazardous...

Page 6: ...justable from 1 to 240 minutes or 1 to 240 hours Temperature Sensor Inputs Quantity Two inputs standard Types 100 Ω platinum RTD 3 wire α 0 00385 ohms ohm C Can be extended with a 3 conductor shielded cable of 20 Ω maximum per conductor Alarm Outputs AC relay Isolated solid state triac SPST 0 75 A maximum 100 V to 277 V nominal Dry contact relay Pilot duty only 48 V dc 500 mA maximum 10 VA maximum...

Page 7: ...t time in use Alarm conditions Low high temperature low current Ground fault alarm trip RTD failure loss of programmed values or EMR failure Other Password protection Connection Terminals Power supply input Screw terminals 22 8 AWG Heating cable output Screw terminals 22 8 AWG Ground Two box lugs 14 6 AWG RTD alarm communications 28 12 AWG spring clamp terminals Mounting FRP Poly carbonate enclosu...

Page 8: ...ell as your nVent representative Keep the shipping materials for the carrier s inspection 2 3 INSTALLATION LOCATION The wide ambient operating temperature range of the controller permits installation in most locations Considerations should include accessibility for maintenance and testing and the location of existing conduits 2 4 MOUNTING PROCEDURES The mounting template is shown in Figure 2 1 Dri...

Page 9: ...ication Do not attempt to use wire sizes that exceed the marked terminal ratings and avoid terminating two wires on the same terminal whenever possible Note Make sure that power terminals are retightened several days after installation Stranded wire will tend to compress when initially installed therefore these terminals should be checked for tightness several times after the system is installed t...

Page 10: ...e terminals provided 2 5 3 External Device Control Override The C910 485 controller can be forced on or off using an external device with a dry contact Figure 2 5 Wiring for External Device Control Override 2 6 ALARM RELAY CONNECTIONS Two types of alarm relays are provided One is a DC contact and can be connected as dry contact Fig 2 6 or as a 12 Vdc contact Figure 2 7 The second is an AC relay tr...

Page 11: ...nVent com 11 Alarm Output Wiring Figure 2 6 Used As a Dry Contact Figure 2 7 Used As a Switched DC Contact Figure 2 8 Used As an AC Alarm Relay ...

Page 12: ...ay Figure 2 11 Used as a Powered AC Alarm Relay 2 6 1 Communication Signal Connections The C910 485 controller includes a RS 485 communications interface Use twisted pair shielded cable communication wiring Ground the shield on communications wiring at one end only using the terminals provided ...

Page 13: ...oller due to a heating cable fault the integrity of the heating cable should be verified by performing the commissioning tests detailed in the appropriate product installation and operating manual These manuals can be found on nVent com These tests must be performed with the controller output disconnected Once the cable has been checked it may be reconnected to the controller and power applied ...

Page 14: ...ALARM MONITOR and CONFIG The SHIFT LED illuminates indicating the next key uses the alternate shifted function Pressing SHIFT again cancels the alternate shifted function TEST Turns on heating cable circuit for 30 seconds SHIFT TEST Switches the console to the Alarm reset mode BACK Exits the current menu or cancels the new setting when editing a parameter Moves the cursor to the left when editing ...

Page 15: ...d is allowing current to flow into the heating cable circuit The ALARM LED will flash approximately once per second when the controller has detected an alarm condition Two additional LEDs are used to indicate external communications activity and are only used with the C910 485 with the optional RS 485 communications interface The Rx LED flashes to show that the Controller is receiving information ...

Page 16: ...reset any alarms that may exist The LED above the ALARM key is illuminated while in this mode To enter this mode Monitor This mode allows you to examine any of the controller readings such as temperature load current etc The LED above the MONITOR key is illuminated while in this mode To active this mode Configure This mode allows you to access the console menus to examine or alter the settings The...

Page 17: ...nVent com 17 ...

Page 18: ...DIS 10 4 2 10 HI TS 1 HI TS 2 180 F 11 4 2 11 TS 2 Fail DIS 12 4 2 12 TS 1 HI LIMIT TS 2 HI LIMIT TS 1 HI LIMIT Setpoint TS 2 HI LIMIT Setpoint TS 1 HI LIMI Alarm TS 2 HI LIMI Alarm DIS 200 F DIS 13 4 2 13 LO Load ENA 14 4 2 14 LO Load 1 0 A 15 4 2 15 Load Defaults No 16 4 2 16 HI GFI 20 mA 17 4 2 17 GFI Trip 30 mA 18 4 2 18 TS Fail Mode ON 19 4 2 19 TS CTL Mode TS 1 FAIL ON 20 4 2 20 OVERRIDE Sou...

Page 19: ... Assignment Purpose A 19 character alphanumeric TAG may be assigned to a control point to allow it to be easily associated with a pipe vessel process circuit drawing name or number Setting Any combination of 19 characters from A Z 0 9 or ...

Page 20: ...nVent com 20 4 2 2 Setting Units Purpose This allows selection of the type units temperature or size to display on the operator Setting Metric or Imperial Factory Default Imperial ...

Page 21: ...lows selection of the type of algorithm to be used to maintain the control setpoint temperature Reference Figure 2 5 for the External Direct wiring schematic Setting On Off or Proportional Ambient Sensing Control PASC External Direct Factory Default On off ...

Page 22: ...om 22 4 2 4 Control Setpoint Purpose This is the temperature that the controller uses to determine whether its output switch should be on or off Setting Range 0 F to 200 F 18 C to 93 C Factory Default 40 F 4 C ...

Page 23: ...he deadband is a window of difference between the measured control temperature and the desired control setpoint temperature and provides the decision to turn the output off or on Setting Range 1 F to 10 F 1 C to 6 C Factory Default 5 F 3 C ...

Page 24: ... control mode sets Proportional Ambient Sensing Control PASC See Appendix A for more details Setting Range Factory Default Pipe Size inch 1 or 2 Control Setpoint 0 to 200 F 18 to 92 C 40 F 4 C Min Design Ambient 99 to 125 F 73 to 52 C 40 F 40 C Power Adjust Factor 10 200 100 ...

Page 25: ...ble Lo TS 1 and Lo TS 2 Purpose This allows the user to enable or disable the low temperature alarm for temperature sensor number 1 and 2 Alarm time delay filter is factory set at 15 minutes Setting Range Enable or disable Factory Default Enable ...

Page 26: ...ing Lo TS 1 and Lo TS 2 Purpose This allows the user to set the low temperature alarm setting for temperature sensor number 1 and 2 Alarm time delay filter is factory set at 15 minutes Setting Range 0 F to 180 F 18 to 82 C Factory Default 35 F 2 C ...

Page 27: ...nabled high limit cutout feature will force the controller output off if the temperature reading exceeds the HIGH ALARM temperature setting This is a non latching condition so once the reading drops below the HIGH temperature ALARM setting the controller will resume normal operation Alarm time delay filter is factory set at 15 minutes Setting Range Enable or disable Factory Default Disable ...

Page 28: ...ng Hi TS 1 and Hi TS 2 Purpose This allows the user to set the high temperature alarm Setting for temperature sensor number 1 and 2 Alarm time delay filter is factory set at 15 minutes Setting Range 0 F to 200 F 18 to 93 C Factory Default 180 F 82 C ...

Page 29: ...emperature Sensor Failure Alarm Purpose This allows the user to enable or disable the temperature sensor failure alarm Alarm time delay filter is factory set 2 minutes Setting Range Enable or disable Factory Default Disable ...

Page 30: ...t out Setpoint and Alarm HI Limit TS1 HI limitTS2 Purpose Set high temperature alarm and cut out values Settings Ranges Enable Disable HI Limit Set point 0 F 18 C to 200 F 93 C Enable Disable Alarm Factory Defaults Disable 200 F 93 C Disable ...

Page 31: ...rpose This allows the user to enable or disable the low load current alarm to detect current levels which are lower than a preset limit for the application Alarm time delay filter is factory set at 2 minutes Setting Range Enable or disable Factory Default Enable ...

Page 32: ... 14 Low Load Current Alarm Setting Lo Load Purpose This allows the user to set the low load current alarm level Alarm time delay filter is factory set at 2 minutes Setting Range 0 3 A to 30 A or off Factory Default 1 A ...

Page 33: ...com 33 4 2 15 Factory Default Settings Load Defaults Purpose To provide a quick method of re Setting the controller s configuration parameters to the Factory Default parameters Setting N A Factory Default N A ...

Page 34: ...imit will trigger the alarm to indicate that a ground fault condition exists in the heating cable circuit To protect against the risk of fire or shock ground fault level should be set at the lowest level possible to allow normal operation of the cable Alarm time delay filter is factory set as immediate Setting Range 20 mA to 100 mA Factory Default 20 mA ...

Page 35: ...switch being latched off and the Ground fault Level Trip Alarm activated to indicate a ground fault condition WARNING Fire Hazard Ground fault trip alarms must not be ignored To prevent the risk of fire do not re energize heating cables until the fault is identified and corrected Alarm time delay filter is factory set as immediate Setting Range 20 mA to 100 mA Factory Default 30 mA ...

Page 36: ...t com 36 4 2 18 Temperature Sensor Failure Mode Purpose This mode sets the controller to turn the output switch ON or OFF if all selected temperature sensors fail Setting Range On or off Factory Default On ...

Page 37: ...one of eight possible temperature control modes for the controller The different modes allow redundant fail safe temperature sensing Setting Range 1 TS1 Fail ON 2 Lowest Fail to Good 3 Lowest Fail ON 4 Average Fail to Good 5 Average Fail ON 6 TS2 Fail to TS1 7 TS2 Fail ON 8 TS1 Fail to TS2 Factory Default TS1 Fail On ...

Page 38: ...pose Using an external input device to override sensor inputs Force on or force off Reference Figure 2 5 for the wiring connection schematic Setting Range Ext Input Not used Force on or Inhibit Override Remote or External input Factory Default Not used Remote ...

Page 39: ...nVent com 39 4 2 21 Firmware Version Purpose This menu displays the revision level of the firmware programmed into the controller Setting Range N A Factory Default N A ...

Page 40: ... 4 2 22 Passcode Purpose The four digit numeric PASSWORD stops unauthorized users from modifying the controller s configuration parameters using the Operator Console Setting Range 0000 to 9999 Factory Default 0000 ...

Page 41: ...language used by the controller to communicate with other devices The C910 485 only communicates using Modbus Protocol The C910 485 automatically detects when it is connected to the ACS 30 network Setting Range See C910 485 Communication Parameters Table Factory Default HTCBus ...

Page 42: ...lect a BAUD RATE that is compatible with the communications interface installed Parity NONE EVEN ODD Defines the type of parity bit to be used with MODBUS communications Select the desired type of parity Note that PARITY can only be selected when using MODBUS protocol Hardware RS 485 Identifies the type of communications interface installed in the C910 485 Driver Auto RS 485 RS 232 Modem Defines t...

Page 43: ...he selected interval It is used to test the integrity of the heating cable circuit Note Although the autocycle function helps monitor the functionality of the heating cable circuits it does not eliminate the need for preventive maintenance as detailed in the heating cable operating manuals Setting Range Enable or disable Factory Default Disable ...

Page 44: ...nVent com 44 4 2 25 Auto Cycle Interval Purpose Set the interval for running the autocycle procedure Setting Range 1 to 240 minutes or hours selected in the Auto cycle units menu Factory Default 8 ...

Page 45: ...nVent com 45 4 2 26 Auto Cycle Units Purpose Select the Autocycle interval time units Setting Range Minutes or hours Factory Default Hours ...

Page 46: ...the number of off to on transitions of a contactor reaches or exceeds the Contactor Count Alarm Setting This serves as a method to perform preventative maintenance on the contactor before a failure is likely to occur Setting Range 0 to 999 999 Factory Default 200 000 ...

Page 47: ...tor and Maintenance Menus Purpose The Monitor menu displays the measured and stored readings You can also reset counters from this menu Setting Range See C910 485 Monitoring and Maintenance Parameters table Factory Default N A ...

Page 48: ... all the LEDs of the Operator Console to ensure that they are functioning properly Recorded Values Temperature values This feature indicates the maximum and minimum temperatures recorded by the C910 485 since the last time the values were reset Max Control temp Min Control temp TS 1 Max Temp TS 1 Min Temp TS 2 Max Temp TS 2 Min Temp Contactor cycle count This feature indicates the total number of ...

Page 49: ...ine the next previous active alarms Setting Range See Alarm Filter Times Factory Default N A Alarm Filter Times Alarm Type Filter Time Lo TS 1 and 2 15 minutes Hi TS 1 and 2 15 minutes Lo load current 2 minutes Hi ground fault alarm 10 seconds Hi ground fault trip 1 second OPEN SHORTED TS 1 and 2 10 seconds Contactor count 1 seconds Switch failure 2 minutes ...

Page 50: ...oth the alarm output relays dry contact and AC alarm for normally open or normally closed operation The normal condition is assumed to be when the HTC is powered and no alarms exist Setting Range Normally Open N O or Normally Closed N C Factory Default Normally closed ...

Page 51: ...ing temperature Bad damaged or incorrectly installed RTD extension wire Wire used for extension of the RTD should be three wire twisted and shielded with the shield grounded at the controller only Each of the three lead wires must be of the same gauge Terminal connections are not tight Verify tightness of connections RTD or extension cable damaged Install new RTD and or cable High temperature TS 1...

Page 52: ...cable WARNING Fire Hazard Ground fault trip alarms must not be ignored To prevent the risk of fire do not re energize heating cables until the fault is identified and corrected Low current Low or no source voltage Verify correct power distribution Damaged or inoperative heating cable Repair or replace heating cable Open connection wiring problem Verify correct power distribution wiring Contactor f...

Page 53: ...ured ambient temperature desired maintain temperature minimum ambient temperature assumption used during design and size of the smallest pipe diameter to calculate how long the heating cable should be on or off to maintain a near constant pipe temperature The power to the heat tracing is proportioned based upon on the ambient temperature If the ambient temperature is at or below the minimum design...

Page 54: ...1688 Fax 86 21 5426 3167 cn thermal info nvent com Latin America Tel 1 713 868 4800 Fax 1 713 868 2333 thermal info nvent com 2018 nVent All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates All other trademarks are the property of their respective owners nVent reserves the right to change specifications without notice Raychem IM H58415 C910series EN 1805 nVent c...

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