AccuFlo
®
Zero
– Installation and Operating Instructions
17
Installation and operating instructions AccuFlo
®
Zero
9.2
Electrical data
Attention:
before assembling and operation you have to operating voltage and the copolarity. Furthermore,
choose the correct terminals (see chapter 5.5).
Electrical connections
Supply voltage
24 V DC; at least 2.1 A
Signal to the status relay
Option 1: +24-V-signal from AccuFlo
®
Zero to control
station
Option 2: connected AC/DC-signal (max. 48 V) with
supply from the control station
Inputs
Transmitter
Two-wire-interface 4
–20 mA
Supply of the transmitter
Provided
Digital communication
HART
®
Maximum wire length between AccuFlo
®
Zero
and transmitter
5 m
Outputs
Output signal
Two-wire-interface 4
–20 mA
Maximum wire length between AccuFlo
®
Zero
and control station
1 km with standard wire and 2 km at use of wires with
low capacity (< 95 pF/m)
Maximum load
300
Ω
Status relays
Two status relays for signaling of
„zero-point
calibration successful
“ and „ready“ (may be grouped
up to one signal)
Interfaces
External RS485-Bus
AccuMind
®
(flow computer unit of SKI GmbH)
Configuration
Permanent bridges
Basic functions are to be chosen by using jumpers.
Short-time bridges
A manual zero-point calibration or a correction of
positioning may be influenced by a quick connection
of terminals
