Chapter 6: Operating Instructions for Other Auxiliary
Functions
DTM temperature controller operating manual
6.3 CT Alarm Functions
6.3.1 Explanation of CT Alarm Functions
Each channel in the DTM system and measurement expansion modules provides two CTs (CT1, CT2);
When a user wishes to use CT functions, there are two methods that can be used to check the current:
The first method consists of directly performing CT current detect of the corresponding station number CT
module (see item g. in Section 6.3.2). This method can only read the dynamic CT current value, and
cannot deal with alarm functions; The second method consists of using a measurement device to perform
current detect (see items c. and d. in Section 6.3.2). First set the input channel corresponding to the CT,
but the output channel must be used when the CT is in use. The CT will be able to detect the current only
when the output channel is ON. Because a measurement device is used in this method, it can detect
whether the CT current exceeds the preset alarm range when alarm functions have been set; if the
current exceeds the alarm range, the alarm will be activated.
Notes: The reason the second method [can only read the current value when the output channel is ON] is
because the purpose of using CT when alarms are set is to determine the level of the current in the
temperature control equipment, and not just to detect the current.
6.3.2 CT Alarm Function Settings
A. Setting CT alarms: Please refer to alarm mode setting 9 (CT1) or 17 (CT2) in [Section 4.3]
B. CT alarm output upper/lower limits: Please refer to [Section 4.3], setting units are 0.1A
C. CT1 & CT2 use settings: (using measurement device)
There are restrictions on the use of CT. First, the input channel corresponding to a CT must be
set first, and further setting performed in accordance with the output of that input channel.
Furthermore, CT1 and CT2 may differ due to their output device types; the following is a detailed
introduction:
1. CT1 is used in conjunction with output 1. At that time output 1 must be set as an expansion
cassette, and the station number of DTM-CT030 corresponding to CT1 can be 1~F.
2. CT2 is used in conjunction with output 2. At that time, output 2 can be set as an expansion
cassette or IO expansion module. When output 2 is set as an IO expansion module, CT2
will correspond to DTM-CT030, which must be the same as the IO expansion module
station number of output 2, and must be placed in the 9~F area; However, when output 2
is configured as an expansion cassette (typically employed in measurement devices with 4
channels), then both CT2 and CT1 may be simultaneously set as the same DTM-CT030,
and the station number settings should be 1~F (refer to the example application shown in
the figure below).
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