Wiring The Host Controller - ABB LevelMaster 7100 User Manual

Wiring the host controller

The procedures in this section describe the wiring at the host controller end in general purpose locations and hazardous
locations. General purpose installations wire the LevelMaster directly to the host controller. Hazardous location installations wire
the LevelMaster and host controller through a required CSA-certified barrier (no direct wiring is permitted). Select the
appropriate procedure for the type of location where the LevelMaster(s) is being installed.
CAUTION - Equipment damage. The output voltage (VOUT) at the serial (COM) ports on an ABB Totalflow flow
computer or remote controller is dependent upon the external power supply connected to these devices.
Before connecting the LevelMaster to these ports, ensure that the flow computer or remote controller input voltage
does not exceed 15 Vdc.
Connecting the LevelMaster to host controllers with an input power larger than 15 Vdc (for example devices
powered by 24 Vdc voltage sources) will result in damage to the LevelMaster because the output power from the
serial port (VOUT) will also be larger than 15 Vdc. Use an independent power source if unable to power the unit
from the flow computer or controller.
General purpose locations
In general-purpose or unclassified locations, the LevelMaster can be wired directly to the host controller and external power
source (if one is required). This procedure assumes power is being supplied from one of the host controller serial (COM) ports.
IMPORTANT NOTES: Determine which COM port is available for wiring on the host controller. Some ABB
Totalflow devices have COM1 pre-configured and reserved for remote communications.
COM ports on Totalflow flow computers or remote controllers must be configured as RS-485 ports to support the
connection with the LevelMaster. Ensure that legacy RS-485 modules or hot-swappable configurable serial
modules (for newer controller models) are installed prior to wiring.
When no COM ports are available onboard the controller, TFIO modules for serial communications or Ethernet-to-
serial converters can be used to connect the LevelMaster. TFIO modules or compatible third-party converters are
available for purchase from ABB.
Wiring the host controller
To wire the host controller:
1. Select an available COM port on the host controller. Ensure that the COM port is configured for RS-485 communication.
2. Remove the COM port terminal connector from the remote controller or flow computer.
3. Loosen the screws on the COM connector.
4. Insert the wires from the LevelMaster in the COM port. See Figure 28 for quick reference or see detailed drawings
depicting specific equipment in section 4.5.1.2, Examples of wiring to different ABB Totalflow host controllers.
IMPORTANT NOTE: Wiring pinouts on ABB Totalflow remote controllers or flow computers vary depending on the
model installed in the field.
a. Insert the communication wires from (T+, T-) in the COM port communication pins BUS(+) and BUS (-) respectively.
b. If the COM port is supplying power to the LevelMaster, insert the power wires in the COM port power pins (PWR or
PWR and GND).
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