Dwyer UFB - Manual (Page 12)

2: Installation
8
2.2.3 Connecting the instrument
All cables enter the instrument through the (4) cable glands and then connected to terminal blocks which are
located behind a safety cover. The terminal blocks use a spring-loaded securing mechanism which is opened by
lifting the orange tab situated on the top of the terminal connection.
Control & monitoring cables
Depending on the fitted options, any of the following control and monitoring cables may be required:
• Current output – a 4 to 20 mA, 0 to 16 mA, or 0 to 20 mA monitoring signal is output at terminal mA+ and
mA-. (mA+ is the current output terminal and mA- is the return terminal).
• Pulse output – an opto-isolated pulse output is available at terminals PULSE+ and PULSE- (PULSE+ is the
pulse output terminal and PULSE- is the return terminal).
• Alarm Outputs – two programmable, multifunction alarm outputs are available using MOSFET, SPNO
relays. The relays, which are rated at 48 V/500 mA continuous load, are connected to terminals
ALARM1+, ALARM1-, ALARM2+ and ALARM2- respectively.
1. Remove the terminal block cover.
2. Route the control and monitoring cables through the two smaller cable glands.
3. Cut the wires to length, strip back the insulation by approximately 0.4in (10 mm) and connect them to the
required terminals identified in Figure 2.1.
4. On completion, tighten the cable glands to ensure the cables are held securely.
Power connections
The UFB instrument can be powered from a mains supply (86 to 264 Vac, 47 to 63 Hz) or from a 24 V(ac/dc)
supply if it is fitted with a 24 V supply module.
1. Route the power cable through one of the two cable glands located below the power connection terminals,
using the gland most suitable for the power cable diameter.
2. Cut the wires to length, strip back the insulation by approximately 0.4 inches (10mm), and connected to them
to the correct power supply terminals identified in Figure 2.1.
3. On completion, tighten the cable glands to ensure the cables are held securely.
4. Refit the terminal block cover.
WARNING
LETHAL VOLTAGES
Ensure the power cable is isolated from the mains supply.
Do not apply mains voltage with the terminal cover removed.
WARNING
SUPPLY EARTHING
If the equipment is powered from a 24V AC supply then the
supply must be isolated from earth.