Specifications

3.1.10 Sensor Input Option MCB 114
The sensor input option card MCB 114 can be used in the
following cases:
•
Sensor input for temperature transmitters PT100
and PT1000 for monitoring bearing temperatures
•
As general extension of analogue inputs with one
additional input for multi-zone control or differ-
ential pressure measurements
•
Support extended PID controllers with I/Os for set
point, transmitter/sensor inputs
Typical motors, designed with temperature sensors to
protect bearings from being overloaded, are fitted with 3
PT100/1000 temperature sensors; one in front, one in the
back end bearing, and one in the motor windings. The
Danfoss option MCB 114 supports 2- or 3-wire sensors with
individual temperature limits for under/over temperature.
An auto detection of sensor type, PT100 or PT1000 takes
place at power up.
The option can generate an alarm if the measured
temperature is either below the low limit or above the
high limit specified by the user. The individual measured
temperature on each sensor input can be read out in the
display or by readout parameters. If an alarm occurs, the
relays or digital outputs can be programmed to be active
high by selecting [21] Thermal Warning in parameter group
5-**.
A fault condition has a common warning/alarm number
associated with it, which is Alarm/Warning 20, Temp. input
error. Any present output can be programmed to be active
in case the warning or alarm appears.
3.1.10.1 Electrical and Mechanical Specifications
Analogue Input
Number of analogue inputs 1
Format 0–20 mA or 4–20 mA
Wires 2
Input impedance <200 Ω
Sample rate 1 kHz
3rd order filter 100 Hz at 3 dB
The option is able to supply the analogue sensor with 24 V
DC (terminal 1).
Temperature Sensor Input
Number of analogue inputs supporting PT100/1000 3
Signal type PT100/1000
Connection PT 100 2 or 3 wire/PT1000 2 or 3 wire
Frequency PT100 and PT1000 input 1 Hz for each channel
Resolution 10 bit
Temperature range
-50–204 °C
-58–399 °F
Galvanic Isolation
The sensors to be connected are expected to be galvanically isolated from the mains voltage
level IEC 61800-5-1 and UL508C
Cabling
Maximum signal cable length 500 m
Selection VLT® HVAC Drive FC 102 Design Guide
56 MG16C102 - Rev. 2013-08-20
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