DigiTrace 920 Series Heat Trace Controller - Pentair Thermal ...

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Section I – Overview1.1 Controllers Covered by this Manual1.2 Product OverviewThis document covers the 920 Series of heat trace controllers and available options. Theinformation coincides with the specific releases of firmware for the 920 product which are listedon the cover. As Pentair Thermal Managament releases new firmware to modify or enhancethe product significantly, new documentation will accompany these releases. To ensure thatyou are using the correct documentation for your particular version of controller, please checkthe firmware version number of the 920 against the version number listed on the front of thismanual. This can be displayed using the optional 920 Operator Console or a communicatingdevice. As subsequent changes are made, supplements to this document will be included inmanuals shipped after the firmware is released. Supplements will make specific reference to theoperational or functional changes.1.2.1 DESCRIPTIONThe 920 Series Heat-Tracing Controller controls, monitors, and communicates alarms and datafor one or two heating circuits. As a dual-point device, it offers a complete range of control andmonitoring features, as well as superior reliability compared to multipoint systems. Its modular,scalable architecture yields cost-effective multipoint assemblies without the expense of additionalcontrol points that are not required. Available for use with external solid-state relays (SSRs) orcontactors in either one-, two-, or three-pole configurations and the ability to switch loads up to600 Vac makes the 920 the most versatile product on the market.1.2.2 FEATURESA detailed description of available features can be found in Section III of this manual. Highlights ofspecific features are included in the following text.Front DisplayThe control module includes LED status indicators to show output and alarm conditions. Usingthe optional 920 Operator Console, the setpoint temperature, actual control temperature, and loadcurrent are immediately accessible to plant operators and maintenance staff. The display units arefield selectable for °F or °C.–40°F to 140°F (–40°C to 60°C) OperationExtended temperature operation permits installation in all but the harshest environments. SSRoutput modules are limited to operating ambient temperatures of 104°F (40°C) without derating.Single or Dual Temperature Sensor InputsThe ability to use one or two temperature sensor (TS) inputs for each control point allows theselection of one of eleven control modes and programming of all temperature parameters.High and Low Temperature AlarmsHigh and low temperature alarms are offered for both inputs of each control point.High and Low Current AlarmsLow current alarm is more than just a continuity level alarm. The 920 offers full adjustment overthe entire current measurement range for both high and low current alarm limits.Solid State or Contactor OutputThe 920 is available with externally-mounted solid-state relay (SSR) output switches or contactors.With the SSR option, the user may select a time-proportional control algorithm, a simpledeadband mode, or one of two ambient control algorithms. The contactor versions always useeither the deadband mode or the proportional ambient contactor mode. Switching device failurealarms are supported for both types of output devices.THERMAL MANAGEMENT SOLUTIONS EN-DigiTrace920series-IM-H56874 04/13 6 / 82
Ground-Fault Alarm and TripGround-fault (GF) current levels are monitored and displayed in milliamps. The availability of theactual ground-fault level gives the user the choice of both alarm and trip levels suitable for theparticular installation. Using multiple SSRs or a multipole contactor allows all powered legs ofnon-neutral circuits to be switched off under GF conditions.Overcurrent ProtectionA unique overcurrent protection algorithm greatly reduces the possibility of damage to the circuitor the controller in the event of a temporary overload while allowing for initially high in-rushcurrents (SSR options only).Soft StartingGiven the circuit breaker size, the 920 will limit the energy let-through to help prevent nuisancebreaker trips due to cable in-rush. This feature makes the controller particularly attractive for usewith self-regulating cables (SSR options only).Minimum/Maximum Temperature TrackingThe controller maintains the minimum and maximum temperature values seen by the controllersince the last reset of these values. This is helpful in determining causes of temperature alarms.Latching/Non-Latching Temperature AlarmsUser-selectable, non-latching temperature alarms allow the controller to automatically clear thealarm when the condition no longer exists.High and Low Voltage AlarmsOperating at voltages less than design can cause serious loss of heater output. The alarming ofpreset voltage deviations ensures availability of sufficient wattage output.Power LimitingThe 920 will control the maximum output wattage if the full load power exceeds the specifiedmaximum power setpoint. This feature eliminates the need for low voltage transformers in manyapplications and can assist in standardization of heating cable types (SSR options only).AutocyclingThe controller will energize the circuit for 10 seconds at a programmable interval. Circuit alarmswill be generated at the time of autocycle instead of when the heat is required. This featureeliminates the need for a preventive maintenance program as these tests are performed at regularintervals by the controller.Temperature Sensor Failure AlarmBoth open and shorted sensors are detected and alarmed by the controller.Random StartA startup delay between 0 and 9 seconds ensures that all units do not come on line at the sametime.Full Digital CommunicationsAn optional internal communications interface allows the communication of alarms and analogdata to a monitoring system. Industry-standard RS-232 or RS-485 serial communications areavailable for applications requiring direct interfacing to other devices. The modem versionmaintains compatibility with legacy products including the GCC-9000/780 Series (GroupCommunications Controller). With the availability of the heat trace data at the user’s fingertips,historical trending of temperatures, power consumption, or other parameters are available foranalysis and system optimization.THERMAL MANAGEMENT SOLUTIONS EN-DigiTrace920series-IM-H56874 04/137 / 82
Page 8 and 9: CSA C/US and c-ETL-us ApprovedThe 9
Page 10 and 11: 1.5.1 ENCLOSURE ASSEMBLYEnclosure A
Page 12 and 13: The user may want to consider enclo
Page 14 and 15: Temperature SensorsTerminal No.Poin
Page 16 and 17: 2.7.6 INPUT POWERThe 920 controller
Page 18 and 19: Section 3 - Programming and Configu
Page 20 and 21: 3.5.2 ALPHANUMERIC TAG ASSIGNMENTPu
Page 22 and 23: Range: 0.3 to 100.0 amps(CURRENT TU
Page 24 and 25: 3.5.15 TS 1 HIGH LIMIT CUTOUTPurpos
Page 26 and 27: IMPORTANT:• Auto-cycling should a
Page 28: 3.6 Common Controller SetupThis is
Page 31 and 32: • This alarm must be enabled and
Page 33 and 34: Procedure: Enable or disable the al
Page 35 and 36: • If the user resets an alarm whi
Page 37 and 38: efore the corresponding alarm will
Page 39 and 40: the overcurrent trip limit and the
Page 41 and 42: the 920 control module, these param
Page 43 and 44: 3.10 Operator Console Functionsbut
Page 45 and 46: eset. All load-shedding parameters
Page 47 and 48: interface.IMPORTANT: The controller
Page 49 and 50: Section 5 - Control Modes5.1 Introd
Page 51 and 52: 5.3 Load Shedding Control ModeLoad
Page 53 and 54:
Section 6 - Troubleshooting6.1 Oper
Page 55 and 56:
If the bounce or instability is exc
Page 57 and 58:
6.3 Common Alarms—What to look fo
Page 59 and 60:
Section 7 - Maintenance7.1 Operator
Page 62 and 63:
Appendix B Typical Enclosure Dimens
Page 64 and 65:
B.3 Four-Point Assembly #10160-1254
Page 66 and 67:
B.5 Twenty-Point Assembly #10160-04
Page 68 and 69:
C.1.2 100Ω NICKEL IRON RTD WIRINGC
Page 70 and 71:
C.3 Communication Wiring C.3 Commun
Page 72 and 73:
C.5 External Input/Output Port Wiri
Page 74 and 75:
Appendix E 100 Ω Platinum RTD Tabl
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Appendix G Factory Default/Configur
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Other Alarms Configuration Sub-Menu
Page 80 and 81:
Other Alarms Configuration Sub-Menu
Page 82:
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