V18345-1020221001 New ABB Valve Positioner

Description

V18345-1020221001 Scaling defines the constant-slope mapping from the value in engineering units sent by the BIU to a

channel’s output current. V18345-1020221001 The default scaling (selection 1) provides an output current range of 4mA

(low span value) to 20mA (high span value) for engineering units values of 4,000 to 20,000. The

illustration below represents the default scaling

V18345-1020221001 Scaling can be customized by changing any of the engineering units and/or output current values

for each point. Span (output current) values are unsigned integers ranging from 0 to 20,000.

Engineering units values are 16-bit signed integers from -32,768 to 32,767.

V18345-1020221001 The scaling values selected do not restrict the hardware output range. For example, a channel with

default scaling will output current below 4mA for engineering units values below 4,000.

It is possible to choose scaling parameters that actually do limit the current output. For example,

associating a low engineering units value of -32,768 with a low span value of 2mA would assure

that commanded values below that level would never be received by the module.

note 1: External power supply maximum voltage is dependent on temperature and user load.

note 2: Thermal (operating temperature) and user load derating curves apply. See below.

note 3: (Vuser – 5VDC) / 20 mA = RL(max)

note 4: In the presence of severe RF interference (IEC 801-3, 10V/m), accuracy may be degraded

to ±0.5% tolerance.

Thermal Derating Curves

The chart below shows the minimum load in ohms at temperatures from 40 degrees to 55 degrees

Celsius for user input power supply voltages of 18V, 24V, and 30V. If output load impedance is

less than the minimum required, additional series resistance must be added.

Instrumentation grade Shielded Twisted Pair wire should be used for best noise immunity. The

shield should be terminated at a local panel ground near the module. The following illustration

shows typical connections for this module.

V18345-1020221001 An Auxiliary Terminal Block can be used to provide additional wiring terminals for the shields.

Auxiliary Terminal Blocks have all terminals connected together internally. The Auxiliary

Terminal Block with box terminals (IC670TBM002) has 13 terminals; each accommodates one

AWG #14 (avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross section) wire. The

Auxiliary Terminal Block with barrier terminals (IC670TBM001) has nine terminals; each can

accommodate one or two wires up to AWG #14 (avg 2.1mm2 cross section).

I/O Terminal Block Terminal Assignments

An Terminal Block with Box Terminals has 25 terminals per module. Each accommodates one

AWG #14 (avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross section) wire, or two wires

up to AWG #18 (avg. 0.86mm2 cross section). If an external jumper is used, single-wire capacity is

reduced from AWG #14 (2.10mm2 ) to AWG #16 (1.32mm2 ). An I/O Terminal Block with Barrier

Terminals has 18 terminals per module. Each terminal can accommodate one or two wires up to

AWG #14 (avg 2.1mm2 cross section). An I/O Terminal Block with Connectors has one 20-pin

male connector per module.

All Return terminals are common to each other

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