2
Communication
terminal（6PIN）
Top
16～26AWG
10～15mm
In-line
installa
tion
For security (to prevent electric shock and fire accident), and reduce
the noise, the module of grounding terminal shall be in strict
accordance with the national electrical code requirements, grounding
resistance should be less than 100
Ω
. When more than one module
is grounded, single point grounding should be adopted. The ground
wire cannot form a circuit. As shown in the following figure
4. Terminal Introduction
4.1User terminal
MTCW-12-NT terminal silk screen
User terminal definition table
Remark
Description
24V+,24V-
Input power DC 24V
Ground
A0，B0
RS485（COM0）
T1+～T16+
Channels 1 to 16 are positive for thermocouple
signal input
T1-～T16-
Channels 1 to 16 are negative for thermocouple
signal input
CJ+,CJ-
The external cold junction compensation is
positive and negative. (Note)
Y01～Y08，COM0 Switch output port channel 1～8
Y09～Y16，COM1 Switch output port channel 9～16
Note
：
CJ+ and CJ- are external thermocouple cold end compensation
terminals (optional), connected with PT100 thermal resistance. When the
connection is not connected or the measured value exceeds the range of
-20
℃
~ 80
℃
, it is automatically switched to the internal cold end
compensation.
4.2 User connection mode
5 things to pay attention to when wiring:
1
All the input and output signal connections and communication
cables shall be shielded layer cables.
2
The thermocouple signal uses the compensation line, the dividing
number should be consistent, positive and negative to
correspond.
3
The signal cable should be away from other cables that may cause
electromagnetic interference, such as the unavoidable set of
metal pipe or wire slot.
4
The metal case of thermocouple should be grounded reliably.
5
The thermostat grounding PGND should be good grounding.
5. Electrical indicator
5.1 Power indicator
Item
Unit
Min
value
Typical
value
Max
value
Remark
Input voltage
range
Vdc
20
24
30
Normal start-up and
working range
Input current
A
/
0.08
/
Normal temperature
rated full load
5.2 Performance indicators
Item
Indicator
Input
signal
Thermocoup
le type
K、J、E、N、T、R、S、B
Input
method
Transistor
output with
open gate
Power supply voltage circuit: 5V ~ 24V; The
maximum circuit power supply voltage circuit:
30V; Loop current: 0.3A /24Vdc; Leakage current
when open：＜0.1mA/30Vdc；Minimum load：5mA
（5Vdc～24Vdc）
Control
cycle
Fast
1～100，the unit is 0.1s.The specific value is
determined by the characteristics of the
temperature controlled object
Slow
1～100，the unit is 1s.The specific value is
determined by the characteristics of the
temperature controlled object
Control method
ON/OFF，Hand，PID
Rated
Type K
－100℃～1200℃（－148℉～2192℉）
