Rev 1. 1 05/08/19
- 4 -
TELSEC
©
MP2 User Guide
3.2.3
Grounding the MP2
There is a ground post on the left and right side of the chassis. Place a ground wire using a minimum 12
AWG conductor from the Electrical panel ground bus (or other approved grounding point) to the ground
terminal on the MP2. Follow national and local codes and practices for properly grounding the system.
3.3
Connecting the Ethernet
Use a standard Cat5 Ethernet cable to connect the MP2 to the local switch or hub. Configure the switch
port to auto speed detect and auto negotiation. A green LED link light on the ethernet jack will be
illuminated when a physical link has been established. The amber LED on the ethernet jack will be
illuminated when the connection is 100Mb and off if the connection is 10Mb.
3.4
Wiring inputs
Wire each input to be used between the input terminal (1-32) and a common terminal (C). There is a
common terminal available for every two inputs available for termination.
The MP2 does not provide
power for sensor operation thus any device requiring power will need an external power source to
operate properly.
Refer to the silkscreen on the enclosure for location of each input and common
terminal. The inputs will support any sensor that is a 10k Type III thermistor: 0-6 VDC or 0-20 mA analog
sensors. In addition, the system accepts dry contact closures or wet contact closures up to 65 VDC.
3.4.1
Thermistors
Thermistors are resistive devices and do not have polarity. Connect one lead to the input terminal of
the desired input and the second lead to a common terminal. Quest recommends using shielded and
stranded cable for all analog sensors. Connect the shield of the cable to chassis ground on the MP2. Cut
the drain wire and isolate the shield at the sensor end of the cable.
Typical of all Quest thermistor
temperature sensors
Quest “Bullet Style” probe
Not polarity sensitive
Figure 2 - Thermistor Temperature Sensor Wiring
3.4.2
Voltage Sensors
The TELSEC
®
MP2 can read and scale any linear voltage input from 0 to 6 VDC.
Sensors requiring power
must be externally powered.
Contact Quest for the Input Scaling spread sheet to determine the correct
number for the Low and High Custom scale factors.
