AB 1407-CGCM module

AB 1407-CGCM module

Technical data of product parameters

Large graphic terminals draw only one fifth of the current when the background
lighting is off. The loss effect drops from e.g. 25 W to only 5 W.
The operator panel’s loss effect = supply voltage x current. Virtually no power goes 1407-CGCM
to external users and no loss effects due to inputs.. If you use a power supply that meets safety standards and only feeds the
operator panel, there is no problem.
2. However, if you have a 24 V unit that also feeds other units, there is reason to 1407-CGCM
be cautious.
The operator panel does not have insulation that meets safety requirements in
the event of a potential short circuit between 230 V AC and 24 V DC. It is
assumed that the 24 V feed is secure, for example, SELV according to
EN 60950 (protection against electric shock) and UL 950.
3. If there is a substantial distance between the relay contacts for 24 V DC and 1407-CGCM
230 V AC, it is OK to use the same 24 V devices for all feeds.
4. Connect 0 V on the 24 V feed to the ground. This offers three advantages:
– Safety is increased. The 24 V feed will not be live in the event of a faulty
connection or short circuit between 0 V (24 V) and 230 V phase.
– Transients on the 24 V feed are connected to the ground.
– No risk that the 24 V feed is at a high level in relationship to the ground.
This is not unusual since there is high static electricityWhen a PC is connected to the panel, the panel’s internal 0 V (GND) will be
connected to the protective ground via the PC.
A number of USB devices can have the shield connected together with the
protective ground. Here, the panel’s 0 V (GND) is connected to the protective
ground when, for example, a USB memory stick, keyboard or similar device is
plugged in.
If a number of units are connected that have a 0 V and a ground connection, and 1407-CGCM
these are connected to various grounding points, there is a substantial risk of problems. Grounding currents go through communication cables, the rear plate of
the controller, and internally in the operator panel, and can cause errors.
Use external units to improve communication and achieve galvanic isolation.
Westermo has good industry-standard insulators that are also insulated from the 24
V DC feed.

Product picture display

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