Door Contact Switch; Mains Supply Connection - Pfannenberg DTT 6401 Serie Instrucciones De Servicio

GB
3.5.3

Door contact switch

WARNING
Danger due to connection of external voltage at the input of the door contact
External voltage can cause severe accidents.
 Connection of external voltage to the input for the door cabinet is prohibited.
 The input/door contact provides low voltage (< 20V, 20mA) for the door contact switch.
Installation of a door contact switch increases safety and prevents increased accumulation of condensate.
 If a door contact switch has not been connected, the connection contact (S1) must always be bypassed.
Door contact switch installation
Requirements
- The cooling unit is de-energized.
Procedure
 The door contact switch is connected to the S1 connection; see or the electrical circuit diagram in the housing
cover.
 The door contact is supplied with low voltage, <20V, 20 mA, from the cooling unit.
 Connect the shielding to the terminal for functional earth on one end.
 A shielded cable with twisted pairs is used to prevent interference.
 If shielded cables are not used, ensure that there are no sources of interference in the immediate vicinity.
Sources of interference include: supply cables and components with increased electromagnetic radiation,
including frequency converters, motor drives, etc.

The door contact switch is connected. The motors switch off when the switch cabinet is opened.
3.5.4

Mains supply connection

WARNING
Potential danger due to incorrect cables
An incorrect cable cross-section will cause the cable to overheat. Scorched insulation can cause fires.
 The cable cross-section (4) matches the output required for the power consumption and is
0.5 – 2.5mm² or AWG 20 to AWG 14.
DANGER
Electric arcing can cause electric shock and burns
When disconnecting and connecting the plug connector for mains connection under load or voltage,
electric arcing, dangerous voltage and electric shock can occur.
 The plug connector for mains connection must never be plugged in or disconnected under
load/voltage.
 Work on plug connectors must only be carried out with adequate lighting.
 Always switch off the circuit breaker and secure against reconnection.
The following general requirements must be assured for safe and reliable operation of the cooling units:
•
Upstream installation of a supply-side temperature regulator is prohibited.
•
Connect the fuse specified on the type plate as a power contactor; see
fuse.
•
Ensure that the type plate specifications for rated values match the present values for mains voltage and mains
frequency; see type
•
Always connect the cooling unit to the mains by means of a separating device (switch/contactor).
 The separating device must have a contact opening of 3 mm. The separating device is installed by the
customer.
Operating Manual DTT 6401 Standard Controller (SC) 086100036 © Pfannenberg GmbH
plate
.
type plate and Adapting the upstream
Page 27 / 42