Door Contact Switch - Pfannenberg DTS Serie Instrucciones De Servicio

ENG
4.6.4

Door contact switch

ATTENTION
Damage to the unit!
Damage to the unit and the controller by applying external voltage to the door contact input.
•
Do not apply external voltage to the door contact input.
•
The door contact input provides a low voltage (< 20 V, 20 mA) for the door contact switch.
Fitting a door contact switch increases the safety and prevents excessive formation of condensate. The door contact switch
switches off the cooling unit motors (fan, compressor) when the switch cabinet is opened.
The door contact switch must interrupt the connection between the terminals X54:4 and X54:5 when the switch cabinet door is
open.
4.6.4.1 Connecting the door contact switch
Requirements
DANGER – Danger to life due to electric shock. Make sure that the unit is voltage-free.
Procedure
1. Connect the door contact switch (S1) according to the connection diagram to the appropriate controller terminal strip, see
"Electrical circuit diagram – Standard-Controller (SC)", Page 32.
–
Use a shielded cable with twisted pairs to avoid interferences. Connect the shield to the terminal for function
ground on one side.
–
If no shielded cables are used, make sure that there are no sources of interference in the immediate vicinity.
Sources of interference are: Power cables and components with increased electromagnetic radiation, these
include, for example, frequency converters or motor drives.
2. Close the switch cabinet, restart the unit and check the function of the door contact switch:
–
Open the switch cabinet door when the unit is in operation, the cooling unit motors (fan, compressor) must switch
off.

The door contact switch is connected.
Operating Manual | Attachment and Installation Cooling Units | Standard Controller (SC) – 400 / 460 V, 3~ | 086100009e
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