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

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Temperature SensorsTerminal No.Point A – Shield 25Point A TS 1 Source (WHT) 26Point A TS 1 Sense (WHT) 27Point A TS 1 Common (RED) 28Point A – Shield 9Point A TS 2 Source (WHT) 10Point A TS 2 Sense (WHT) 11Point A TS 2 Common (RED) 12Point B – Shield 29Point B TS 1 Source (WHT) 30Point B TS 1 Sense (WHT) 31Point B TS 1 Common (RED) 32Point B – Shield 13Point B TS 2 Source (WHT) 14Point B TS 2 Sense (WHT) 15Point B TS 2 Common (RED) 16IMPORTANT: Some RTDs may be constructed with the Sense wire color-coded as Black.2.7.2 ALARM RELAY CONNECTIONSThe alarm output relay is a programmable dry contact output. It may be programmed for N.O.,N.C., steady or flashing operation, and is typically used to annunciate an alarm to an externaldevice such as a DCS, PLC, etc.IMPORTANT: The alarm relay is intended to be used for switching low-voltage, low-currentsignals. Do not use this relay to directly switch line voltages. Ensure that your application stayswithin the ratings of the relay contacts as defined in Appendix A on page 61.The alarm relay may also be used in conjunction with the +9 Vdc source to switch an external,line-voltage relay to drive a local pilot light, etc. Refer to the wiring diagrams in Appendix C onpage 68 for example connection details.Alarm and Control SignalsTerminal No.Alarm relay dry contact output 17Alarm relay dry contact output 18Ground 19+9 Vdc nominal Out (100 mAmps maximum) 1Common 2Common 32.7.3 EXTERNAL INPUT/OUTPUTThese input and output terminals are used to implement the Override and Ambient TemperatureControl Mode features. Refer to Section 3 on page 18 for programming details, and Appendix C onpage 68 for example wiring diagrams.Miscellaneous SignalsTerminal No.External input (+) 20External input (-) 21External output (+) 4External output(-) 52.7.4 COMMUNICATION SIGNAL CONNECTIONSThe communications terminal assignments change based on the type of option installed. If presentin a control module, the type of communications interface will be identified by a label located nextto the module’s rating label.THERMAL MANAGEMENT SOLUTIONS EN-DigiTrace920series-IM-H56874 04/13 14 / 82
Communications wiring should use twisted conductor, shielded cable. Shields on communicationswiring should be grounded at one end only, using the terminals provided.The following tables define the appropriate signal connections for the various types of interfaces:RS-485 (2-Wire) ConnectionsCommunication SignalTerminal No.Receive/transmit data (+) 6Receive/transmit data (-) 22Shield 8Shield 24RS-232 ConnectionsCommunication SignalTerminal No.Receive data 6Data carrier detect 7Clear to send 8Transmit data 22Request to send 23Common 24Modem Interface Connections(Note that these particular signals are not polarity sensitive)Communication SignalTerminal No.Modem 6Modem 22Shield 8Shield 242.7.5 POWER CONNECTIONSAll of the power terminals are numbered for easy identification. Do not attempt to use wire sizesthat exceed the marked terminal ratings and avoid terminating two wires on the same terminalwhenever possible.Always be sure that all terminals are adequately tightened according to the terminal anufacturer’sspecification. See Appendix A on page 61 for allowable wire sizes, recommended insulation striplengths, and tightening torque. A loose terminal can cause arcing and damage to the terminal orincorrect operation of the controller.IMPORTANT: Make sure that power terminals are re-tightened several days after installation.Stranded wire will tend to compress when initially installed; therefore, these terminals should bechecked for tightness several times after the system is installed to ensure that a good con-nectionis maintained. Be certain to use the proper size screwdriver for the terminal blocks to minimizethe chance of damage to the termi-nals.If the controllers are installed in either a metallic or non-metallic enclosure, follow the enclosuremanufacturer’s recommendations for proper grounding. Do not rely on conduit connections toprovide a suitable ground.Grounding terminals/screws are provided for connection of system ground leads. Proper systemgrounding is required for safe and correct operation of the controller’s protection features.THERMAL MANAGEMENT SOLUTIONS EN-DigiTrace920series-IM-H56874 04/1315 / 82
Page 6 and 7: Section I - Overview1.1 Controllers
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 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
Page 76 and 77:
Appendix G Factory Default/Configur
Page 78 and 79:
Other Alarms Configuration Sub-Menu
Page 80 and 81:
Other Alarms Configuration Sub-Menu
Page 82:
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