1, Connect line power to the screw terminals AC, GND or DC in the transmitter. The ground terminal grounds the instrument, which is mandatory for safe operation.
DC Power connection: The TF1100 can be operated from a 9-28 VDC source, as long as the source is capable of supplying a minimum of 3 Watts.
NOTE: This instrument requires clean electrical line power. Do not operate this unit on circuits with noisy components (i.e., fluorescent lights, relays, compressors, or variable frequency drives). It is recommended not to run line power with other signal wires within the same wiring tray or conduit.
2, Connect the 4~20mA wires to the appropriate (4~20mA + -) (The 4-20 mA output do not requires power from an external DC power supply)
3, PLUSE can be setting as Pluse and Frequency. RELAY can be setting as Pulse output is Only For Flow Rate Output.
The pulse output is utilized to transmit information to external counters and PID systems via a frequency output that is proportional to system flow rate. The frequency output range of the Pulse is 0–9,999 Hz.
The type of pulse output is an open-collector transistor (OCT) type that requires an external power source and pull-up resistor. External DC power Supply is depending on Pulse Output receiver, 5-24V is allowable.
4, Relay “+, -”, only For Totalizer Output or Relay Alarm Output.
Once the transmitter is powered on, the “RELAY +, -” output is normally Open state. When the relay is used for totalizer output, connect terminal “RELAY + -“, select the corresponding totalizer in Menu 79, and setup the minimum display totalizer increments . Every time the totalizer increases a value set the relay closed one time.
When the relay is used for alarm output, connect terminal “RELAY + -“, select the corresponding item, it can be used for several alarm condition. For example, select “Alarm #1”, set “Alarm #1 Low Value” , and set “Alarm #1 High Value”. When the flow is between the low value and high value, the relay is open state, and when the flow is lower than “Low Value”, or higher than “High Value”, the relay is closed state.
5, RS232C or RS485 wiring:
TF1100 Series provide RS232C or RS485 communication output based on user’s option.
6, RS485 (Modbus-RTU) wiring:
TF1100 series default Modbus output is Modbus-RTU protocol, Modbus-ASCII protocol can be optional.
When connect wirings, the “D+” terminal is connected to modbus “A”, and the “D-” terminal is connected to modbus “B”. (More details in APPENDIX 4 MODBUS-RTU COMMUNICATIONS PROTOCOL)
Post time: Jul-31-2022