5
Detect current value: update the current when output. ON;Update time:
set the "detection current cycle".
②
heater broken line detection occasions.
Detect current value: "current when output is ON" .
update current when output is ON.
"Output current when OFF" updates the current when output is OFF.
Update time: fixed at 100ms.
2.The measured current range can be changed according to "CT turn"
and "CT wire crossing times".
3.Alarm can be set by "broken wire detection", "over current detection"
and "short circuit detection".
7.2 CT buffer（BFM）
Function
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CT action
5351 5352 5353 5354 5355 5356 5357 5358
CT measurement waiting
time
5383 5384 5385 5386 5387 5388 5389 5390
CT turn
5415 5416 5417 5418 5419 5420 5421 5422
CT wire crossing times 5447 5448 5449 5450 5451 5452 5453 5454
Heater disconnection
detection current
value
5479 5480 5481 5482 5483 5484 5485 5486
Overcurrent detection
current value
5511 5512 5513 5514 5515 5516 5517 5518
Short circuit
detection current
value
5543 5544 5545 5546 5547 5548 5549 5550
Backlash
5575 5576 5577 5578 5579 5580 5581 5582
Delay time
5607 5608 5609 5610 5611 5612 5613 5614
Recovery condition not
detected
5639 5640 5641 5642 5643 5644 5645 5646
Always detect current
measurement cycle
5671 5672 5673 5674 5675 5676 5677 5678
Current at output ON
7015 7016 7017 7018 7019 7020 7021 7022
Current at output OFF 7047 7048 7049 7050 7051 7052 7053 7054
CT alarm detection
5703,5704
Alarm output forced
enable
5705
Item
Setting value
CT action
0：Always measure current
1：Heater disconnection detection
CT measurement waiting
time
30～300ms
CT turn
100～4000 turns
CT wire crossing times
1～6 time
Heater disconnection
detection current
value
0～350A
Overcurrent detection
current value
0～350A
Short circuit
detection current
value
0～350A
Backlash
0～350A
Detection current
cycle
0.1～3200s
CT alarm detection status word
（
5703
）
Bit status
ON（1）
OFF（0）
Bit0～7 wire break
alarm
This bit is 1 when a wire break alarm
occurs on channels 1 to 8.
No error
Bit8～15
overcurrent alarm
This bit is 1 when an overcurrent
alarm occurs on channels 1 to 8.
No error
CT alarm detection status word
（
5704
）
Bit status
ON（1）
OFF（0）
Bit0～7 wire
break alarm
This bit is 1 when a wire break alarm
occurs on channels 1 to 8.
No error
8. Instructions for use of MTCW-16-NN
1.MTCW-16-NN has no output control. If temperature control is needed,
it is necessary to cooperate with magmet's remote IO (remote IO model:
MEVW-1616T).
2.Connect A1 and B1 of MTCW-16-NN with A0 and B0 of mevw-1616t
through
cables
respectively.Communication
mode:
RS485,
communication protocol: MODBUS
3.Because the default communication parameters are the same, so the
connection can automatically communicate.
4.MTCW-16NN can be controlled by BFM area or temperature control
assistant.
9. Common problems and solutions
When the module does not work properly, please check in turn:
(1) the connection of the power line and the condition of the relevant
switches and protection appliances, so as to ensure the reliable power
supply of the module.
(2) whether the wiring of user terminals is firm.
(3) check whether the 24Vdc power supply is overloaded.
(4) check the application program to ensure that the correct operation
method and parameter range are selected in the application. Special
attention should be paid to the BFM area with special operation timing.
If you still cannot work after the above check, please refer to the
following table.
Phenomenon
Possible Causes
Countermeasures
Loss of power supply or
low voltage
Check the power condition
and exclude it
POWER and
other LEDs are
OFF
Power switch off or fuse
blown
Check the condition of
switches, wires or fuses for
elimination
Abnormal power wiring
Power supply is damaged
Check and confirm whether
the voltage between 24V+
and 24V- terminals is in
normal range;
POWER LED
flashes
intermittently
Unstable power supply
POWER LED
flashes
intermittently
Module damaged
RUN LED
Remotely shut down by the
host computer equipment
Make the upper computer
boot by remote control
Is OFF
System error shutdown
Check with the thermostat
assistant
RUN LED flashes
slowly
Possible system error
Please check the 3612
、
3613
Input status
indicator is
inconsistent with
input terminal
status
The on-resistance of the
subscriber line is too large
Shorten the length of wire, do
not use too thin wire
Poor signal circuit contact
Check connections and
troubleshoot
The output cannot
be turned off
(OFF)
Poor external connection
Damaged relay contact
Frequently operated relay
ports can be replaced with
idle ports
The status
indication is
inconsistent with
the status of the
output terminal
The relay is aging or
damaged, or the indicator
is damaged
The serial port
cannot
communicate
normally
Poor cable connection, or
wrong signal properties of
the connected lines, such
as TXD and RXD are
confused
Connect the signal line
correctly
Inconsistent setting of
communication
master-slave
characteristics, such as
baud rate, parity, data bits,
address
Set the communication
parameters to be consistent
Serial port cannot control
other devices
Communication master and
slave use protocol
inconsistency set the
communication protocol to be
consistent
1
．
Warranty scope refers to the programmable controller body.
