User manual MKA 120
Conforms to
Issue 07.07.2021_01 Page 41
16
Safety instructions
To avoid any danger of electrocution, the housing must never be removed nor opened at the back.
None of the parts inside can be serviced by the user himself. Leave the servicing to the experts! To
avoid fire or electrocution this appliance must not be exposed to humidity or rain.
1. Advice:
Read all safety instructions and all items in the user manual, before using the controller for
the first time! Keep the safety instructions and the user manual in a safe place in case you need to
refer back to them at a later date!
2. Installation instructions:
The appliance should always be installed by authorized and experienced
specialist. Please follow the specific safety instructions as well as the VDE guidelines during
installation. The appliance should only be fitted in an approved and specifically designed waterproof
switching cabinet (metal housing) and should only be used for the purpose it was designed for and
within the limits of its technical data.
We recommend that any down-streamed inductors (relays, contactors, signal transmitters,
valves etc.) with RC elements should be checked for interference. These are available on the
retail market (e.g. Siemens 3 RT1916, Klöckner-Moeller, etc.).
3.
Analogue in- and outputs:
Do not apply separate source voltage to the in- and outputs (4-20mA /
0-10V and Pt100)
4. Sensor leads as well as analogue in and outputs should be run separately from any voltage
carrying leads, this also includes control wires carrying separate source voltage. It is vitally
important that the sensor leads have a metal shielding and that this shielding is connected to
the sensor housing itself.
5. Relay outputs:
The relay outputs are potential free and the maximum load of 250V AC and 4A
must not be overshot.
6. Water and humidity:
Never use the unprotected appliance near water, e.g. near a bath tub, water
basin, sink, washing machine, a damp cellar or near a swimming pool. The appliance is only
waterproof on the front (in compliance with IP65 or IP67). The back and side panels must not come
into contact with water.
7. Ventilation:
The appliance must have sufficient ventilation, the ventilation slits in the housing must
never be covered up, or blocked by objects inserted into the slits.
8. The effects of heat:
Keep the appliance away from heat sources, like radiators, heating conduits,
ovens, and other elements that may radiate heat.
9. Energy sources:
The appliance should only be connected to the power sources that are specified
in the user manual or on the appliance housing itself.
10. Cleaning:
Clean the display and the operator interface only with a damp, soft and clean cloth
without any chemical and mechanical substances. Do not use sharp-edged tools or pointed objects or
other mechanical aids.
11. Appliance not in use:
When you know the appliance is not going to be used for a longer period of
time, it should be disconnected from the mains.
12. Contaminants:
You have to be extremely careful that neither liquids nor foreign objects can get
into the appliance through the openings in the housing. If objects or liquids have contaminated the
inside of the appliance, it has to be disconnected immediately and sent in to the manufacturer.
13. Servicing after damage:
The appliance may only be serviced by a qualified specialist. The user
should only do the servicing tasks he is meant to do according to the user manual. For servicing that
exceeds his authority, a specialist should always be contacted.
