ABB RCNA-01 Uživatelský manuál stáhnout pdf (Strana 261)

100

101

Parameter listing and descriptions 257

ACH550-01 User's Manual

Code Description Range

3501 SENSOR TYPE 0…6

Identifies the type of the motor temperature sensor used, PT100 (°C),

PTC (ohms) or thermistor.

See parameters 1501

AO1 CONTENT SEL and 1507 AO2 CONTENT SEL.

0 =

NONE

1 = 1 x PT100 – Sensor configuration uses one PT100 sensor.

• Analogue output

AO1 or AO2 feeds constant current through the

sensor.

• The sensor resistance increases as the motor temperature rises, as

does the voltage over the sensor.

• The temperature measurement function reads the voltage through

analogue input

AI1 or AI2 and converts it to degrees Celsius.

2 = 2 x PT100 – Sensor configuration uses two PT100 sensors.

• Operation is the same as for above 1 x PT100.

3 = 3 x PT100 – Sensor configuration uses three PT100 sensors.

• Operation is the same as for above 1 x PT100.

4 = PTC – Sensor

configuration uses one PTC.

• The analogue output feeds

a constant current through

the sensor.

• The resistance of the

sensor increases sharply

as the motor temperature

rises over the PTC

reference temperature

ref

), as does the voltage

over the resistor. The

temperature measurement

function reads the voltage

through analogue input

AI1

and converts it into ohms.

• The table below and the graph above show typical PTC sensor

resistance as a function of the motor operating temperature.

Excessive

Normal

Temperature Resistance

Normal < 1.5 kohm

Excessive > 4 kohm

1 2 ... 256 257 258 259 260 261 262 263 264 265 266 ... 473 474

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