West Control Solutions N8840 - Manual (Page 79)

11 Technical data
INPUTS
PROCESS VALUE INPUT INP1
Resolution: > 14 bits
Decimal point: 0 to 3 digits behind the
decimal point
Dig. input filter: adjustable 0,000...9999 s
Scanning cycle: 100 ms
Measured value
correction:
2-point or offset correction
Thermocouples
r Table 1 (page 83 )
Input resistance: ≥ 1 MΩ
Effect of source resistance: 1 µV/Ω
Cold-junction compensation
Maximal additional error: ± 0,5 K
Sensor break monitoring
Sensor current: ≤ 1 µA
Configurable output action
Resistance thermometer
r Table 2 (page 83 )
Connection: 3-wire
Lead resistance: max. 30 Ohm
Input circuit monitor: break and short circuit
Special measuring range
8800/8840 Configurator (engineering tool) can
be used to match the input to sensor KTY 11-6
(characteristic is stored in the controller).
Physical measuring range: 0...4500 Ohm
Linearization segments 16
Current and voltage signals
r
Table 3 (page 83 )
Span start, end of span: anywhere within measuring
range
Scaling: selectable -1999...9999
Linearization: 16 segments, adaptable
with 8800/8840
Configurator
Decimal point: adjustable
Input circuit monitor: 12,5% below span start
(2mA, 1V)
SUPPLEMENTARY INPUT INP2
Resolution: > 14 bits
Scanning cycle: 100 ms
Heating current measurement
via current transformer (→ Accessory
equipment)
Measuring range: 0...50mA AC
Scaling: adjustable -1999...0,000...9999 A
Current measuring range
Technical data as for INP1
Potentiometer
r Table 2 (page 83 )
SUPPLEMENTARY INPUT INP3
(OPTION)
Resolution: > 14 bits
Scanning cycle: 100 ms
Technical data as for INP1 except 10V range.
CONTROL INPUTS DI1, DI2
Configurable as switch or push-button!
Connection of a potential-free contact suitable
for switching “dry” circuits.
Switched voltage: 5 V
Current: 100 µA
Technical data
8840 profiler 79