Danfoss VLT AutomationDrive FC 301 Series Design Manual page 177

Options and Accessories
®
11.2.8 VLT
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 analog inputs with one additional input for multi-zone control or differential pressure
measurements
•
Support extended PID controllers with I/Os for setpoint, 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 backend 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-** Digital In/Out.
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.
11.2.8.1 Electrical and Mechanical Specifications
Analog Input
Number of analog inputs
Format
Wires
Input impedance
Sample rate
Third order filter
The option is able to supply the analog sensor with 24 V
DC (terminal 1).
Temperature Sensor Input
Number of analog inputs supporting PT100/1000
Signal type
Connection
Frequency PT100 and PT1000 input
Resolution
Temperature range
Galvanic Isolation
The sensors to be connected are expected to be galvanically isolated from the AC line voltage
level.
Cabling
Maximum signal cable length
MG33BF22
Design Guide
Rev. 2014-04-04 All rights reserved.
0–20 mA or 4–20 mA
100 Hz at 3 dB
PT100/1000
PT 100 2 or 3 wire/PT1000 2 or 3 wire
1 Hz for each channel
-50–204 °C
-58–399 °F
IEC 61800-5-1 and UL508C
1,640 ft [500 m]
1
11 11
2
<200 Ω
1 kHz
3
10 bit
175