3
When thermocouple inputs are ordered, a special temperature sensor is mounted near the input terminal
block. This temperature input is used by the device for cold-junction temperature compensation.
With a corresponding user configuration, this input may be used as any other input for displaying and alarm
functions, and may for instance signal device overheating.
Discrete inputs (2 discrete inputs):
DESCRIPTION
PARAMETERS
non-isolated TTL –
may be used as an "active" or "passive" input
for "passive" input: '0' at R < 50 Ω, '1' at R > 5 kΩ
for "active" input: '0' at U < 0.8 V, '1' at U > 2.4 V
Relay outputs (up to 8 programmable relay outputs):
DESCRIPTION
PARAMETERS
electromechanical relay (EMR)
max. 250 V, 3 A, NO or NO/NC
solid state relay (SSR)
max. 250 V AC, 1 A
MOS gate
max. 60 V, 0.1 A, optically isolated
output for external SSR
5...24 V, max. 30 mA
System alarm (1 system alarm):
DESCRIPTION
PARAMETERS
electromechanical relay (EMR)
max. 250 V, 3 A, NO/NC
Auxiliary supply voltage for external transmitters: 10…30 V, max. 40 mA (non-isolated)
Digital interface (optional): optically isolated RS485 with ASCII or Bynary protocol
Measurement error: 0.4% from span
Temperature drift: 0.005% from span for 1 °C
Cold junction compensation:
1 °C, automatic software
RTD line compensation: software
3. MOUNTING
Before starting any mounting and wiring operations, please read carefully chapter "Protection from electro-
magnetic disturbances". The requirements stated are important for normal and trouble-free device operation.
3.1.
Protection from electromagnetic disturbances
For proper device functioning, some mounting and wiring requirements must be observed. The aim is
to reduce undesirable electromagnetic interference. Recommendations may include:
- Never lay signal wires close in parallel with power supply or actuator wires.
- Only similar signals may be run close together. Package input signal wires in twisted couples and shield.
- Signal cable branching and terminals are susceptible to noise and should be arranged away from noise sources.
- Connect reliably the ground at measurement point and
controller ground with thick stranded wire.
- All shields must be reliably grounded at one end, preferably
at your device end.
- Avoid sharing supply lines with powerful consumers,
especially inductive loads switched on and off.
- Use shielded 1:1 isolation transformer. A high quality anti-
interference filter may also prove useful.
Fig. 3.1
LINE
LINE
TO DEVICE
SUPPLY
TERMINALS
FROM
POWER
SUPPLY
TO DEVICE
SUPPLY
TERMINALS
NEUTRAL
NEUTRAL