ComAp IL-NT MRS15 - Page 27

InteliLite
NT
– MRS3,4, AMF8,9, SW version 1.4, ©ComAp – October 2008 27
IL-NT-MRS3,4-AMF8,9-1.4-Reference Guide.pdf
Connection of IL-NT analog inputs
AI
1
AI2
2 x RESISTIVE
SENSOR
COM
-POWER
Standard connection of three resistive sensors
to analog inputs.
Analog inputs are designed for resistive sensors with resistance in range of 0Ω to 2,4kΩ.
To ensure a proper function use shielded cables, especially for length over >3m.
Configure input as binary/tristate
- Analog inputs configured as binary or tristate have fixed shutdown alarm.
- Select type of the contact. NO = NormallyOpen, active when closed. NC = NormallyClosed,
active when opened.
- Threshold level in case an analog input is configured as binary or tristate is 750 Ohm.
- In case an analog input is configured as tristate, values <10 Ohm and >2400Ohm are
evaluated as sensor failure (short or open circuit).
Unused analog inputs
Configure Type = Not used
Example of analog input configuration
Configure Engine Temp input for measuring in °C, VDO 40-120°C sensor, range -16 to 120 °C. Alarm
protection level set to 90 °C, shut down level 110 °C.
Start LiteEdit and select – Controller - Configuration – Modify – Engine Temp.
Set configuration for Engine temp analog input:
Type: Selection between Not used and Alarm
“Not used” – analog input isn’t used
”Alarm” – analog input is used
Set to: Alarm
Name: Name of the analog input. Maximally 14 letters.
Set to: Engine Temp
Config: Selection between Analog, Binary Tri-state input.
“Analog” – resistor sensor is connected to Analog input.
“Binary” – open/close contact is connected between Analog input and COM terminal of Analog inputs.
Analog input detects only open/close state.
“Tri-state” – open/close contact is connected parallel to one of two serial resistors between Analog
input and COM terminal of Analog inputs.
Set to: Analog
Alarm Properties: Selection between different direction of protection – Under Limit, Over Limit or
combination with Fail sensor.
“Engine running only” – check this setting if you wish to active protection on analog input only while
engine is running, not, when it stops.