Siemens UL 489, UL1066 specifications Analog Output Module, Power value ranges W/VA

Communication-capable Circuit Breakers

WL Circuit Breaker

Analog Output Module

The analog output module can be used to output the most important measured values sent via the CubicleBUS to analog indicators (e.g. analog meters) in the switchgear cubicle door. Each analog output module has four channels for this purpose. The signals are available at two physical interfaces: a 4 ... 20mA and a 0 ... 10V interface.

The measured values are available as 0 ... 10V via the X4 connector on the CubicleBUS module (the 4 ...

20mA interface is available at X5). Both outputs are always active at the same time, and can be used simultaneously.

The measured values, which are output via the four channels, are selected using a rotary switch. The available outputs are current, voltage, power, frequency and power factor. Up to two analog output modules can be operated on one CubicleBUS. The selection panel on the rotary switch is divided vertically. If the switch is set to a value on the left, the module is automatically addressed as module 1.

If a second module exists, it must be set to a value on the right. This is the only way that two analog output modules can operate simultaneously.

All types of analog instruments with an internal resistance of more than 20kΩ (for the voltage output) and between 50Ω and 250Ω (as a current output) can be used as

an indicator.

The LEDs for the channels are yellow if the current value exceeds the full-scale deflection by 20% (with V, I and P), power factor is greater than 0.8, or the frequency greater than 45Hz.

Switch position "I"

In switch position "I", the measured current values are output linearly:

A01: Current in phase A

A02: Current in phase B

A03: Current in phase C

A04: Current in the neutral conductor

designed for different rated currents, the full-scale value must be scaled automatically and the maximum output value of the analog output module interpreted. The value of the rating plug is used for this purpose.

The maximum value is calculated by multiplying the value of the rating plug by 1.2 and then rounding the result up to the nearest 100.

Example: With a rating plug of 1600A, the full-scale value of the analog panel meter must be 2000A (1600 x 1.2 = 1920 -> 2000A). In other words, 0V/4mA = 0A, 10V/20mA = 2000A.

Switch position "U"

When the rotary switch is in switch position "U", the following voltages are applied to the four analog outputs:

A01: Phase-to-phase voltage Vab

A02: Phase-to-phase voltage Vbc

A03: Phase-to-phase voltage Vca

A04: Phase voltage VN

In most cases, the phase-to-phase voltage is output to the switchgear cubicle doors. This is why the first three channels are assigned these measured values. If the voltage is required between a phase and the neutral conductor, this is available via output A04.

The full-scale deflection for the analog panel meter is calculated by multiplying the rated voltage of the network (primary voltage of the voltage transformer) by 1.1 and then rounding the result up to the nearest 50.

Example: If the rated voltage of the network is 480V, the full-scale value is 550V (480V x 1.1 = 528V -> 550V).

Switch position "P"

If the rotary switch is set to position "P", the power measured values are output via the four channels:

A01: Active power phase kWa

A02: Active power phase kWb

A03: Active power phase kWc

A04: Total apparent power kVATOT

The full-scale deflection of the active power in each phase is calculated by multiplying the value of the rating plug by the rated voltage of the network. The full- scale deflection value is then classified in a value range, as shown in the table below.

Before the full-scale deflection can be determined from the table, the calculated value must be multiplied by 3 for the total apparent power and the total active power (position f).

Example: IR = 1600A, rated voltage = 480V; -> full-scale deflection = 1,000,000 W

Switch position "f"

Since it can generally be assumed that the frequency will be the same across the three phases in all the networks, switch position "f" is used to provide a general overview by outputting the most important measured values (with the exception of the current values). In conjunction with another module in position "I", all the most important measured values can be displayed in this way.

Power value ranges [W/VA]

From	To	Full Scale Deflection
0	50,000	50,000
50,000	100,000	100,000
100,000	200,000	200,000
200,000	300,000	300,000
300,000	500,000	500,000
500,000	1,000,000	1,000,000
1,000,000	2,000,000	2,000,000
2,000,000	3,000,000	3,000,000
3,000,000	5,000,000	5,000,000
5,000,000	10,000,000	10,000,000
10,000,000	20,000,000	20,000,000
20,000,000	∞	30,000,000

Table 2-20After multiplication, the full-scale deflection of the power is sorted into ranges.

Since the circuit breaker can be

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WL MODBUS Communication and Electronic Accessories • January 2005