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4.6.5
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 safety and prevents increased condensate formation. 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.
4.6.5.1
Connecting a door contact switch
Prerequisites
DANGER – Danger to life due to electric shock. Make sure that the unit is voltage-free.
Procedure
Fig. 17: Connecting a door contact switch
1
Door contact/fault indication plug X54
2
Mating plug
1.
Connect the door contact switch (S1) according to the connection plan at the appropriate terminal strip of the controller,
see "Electrical circuit diagram", Page 36.
–
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 no sources of interference are laid 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 running, the motors (fan, compressor) must switch off.
The door contact switch is connected.
Operating Manual | Attachment and Installation Cooling Units | Standard Controller (SC) – 230 V | 086100119
3
Shielded cable, stripping length 8 to 9 mm
5
4
3
2
1
6
5
4
3
2
1
TK TK
SK
SK
SK
ok
Störung/
failure/défaut
G00075
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