87 V6.70 201310176 TELEMETRY OPTIONSThis section will discuss the various telemetry options available, their use andany relevant settings. The TTC-1000 can be optionally equipped with currentloop outputs and a RS-485 DNP3.0 or MODBUS communications interface. AllTTC-1000’s come equipped with a 9 pin DB-9 connector for RS-232 ASCIIcommunications. Temperature information can be retrieved through the RS-232interface.6.1 Analog OutputsThe TTC-1000 is available with up to three analog outputs configured as currentloops. The source for each analog output can be selected from probe 1 (P1),probe 2 (P2), probe 3 (P3), or calculated winding temperature. The analog outputis designed to operate with a series resistance of 10,000 Ohms when set to 0 to1 mA or 510 Ohms when set to 4 to 20 mA. The third analog output is configuredto supply 0 to 1 mA and cannot be switched to operate in the range of 4-20 mA.NEMA units with serial letter suffix ‘B’ contain TB4 for connections to the analogoutputs. All other NEMA units utilize TB2. The terminal marked + is the currentsource output. The connection marked – is the current transmitter’s return. Theseoutputs are fully isolated, but the return may be connected to chassis ground atthe RTU. Grounding the return inside the TTC-1000 is not recommended.NOTE: Connect to the analog outputs through shielded cable. Connect thedrain wire of the shield to the ground stud inside the NEMA 4 enclosure orto one of the studs on the rear of the panel mount version. Twisted paircable is recommended. See section 3.10 for proper shield grounding.The analog outputs A1 and A2 can be programmed for 0 to 1 mA or 4 to 20 mA.Both analog outputs are identically programmed.The scaling of the analog output varies depending on what is being measured.The following table illustrates the scaling dependent on range and the quantitymeasured and whether negative temperature scaling is enabledTable 6.1: Temperature Analog RangesProbe Min @ -35 Min @ 0 Max0 to 1 mA Range:P1, P2, or P3 0 mA @ -35 ºC 0 mA @ 0 ºC 1 mA @ 160 ºCCALC. WINDING 0 mA @ -35 ºC 0 mA @ 0 ºC 1 mA @ 180 ºCLTCDIFF1 & 2 Not Applicable 0 mA @ -20 ºC 1 mA @ +20 ºC4 to 20 mA Range:P1, P2, or P3 4 mA @ -35 ºC 4 mA @ 0 ºC 20 mA @ 160 ºCCALC. WINDING 4 mA @ -35 ºC 4 mA @ 0 ºC 20 mA @ 180 ºCLTCDIFF1 & 2 Not Applicable 4 mA @ -20 ºC 20 mA @ +20 ºC
