Installation; Cable Selection; Wiring - krom schroeder FDU 510 Operating Instructions Manual

3 InstALLAtIon

CAUtIon
– Dropping the device can cause permanent
damage. In this event, replace the entire device
and associated modules before use.
➔ Installation position: vertically upright, horizontal
or tilted to the left or right.
➔ The device is designed for mounting on horizon-
tally aligned 35 × 7.5 mm DIN rails.
➔ If the DIN rail is aligned vertically, end clamps are
required (e.g. Clipfix 35 by Phoenix Contact) to
prevent the device from slipping.
➔ Install in a clean environment (e.g. a control
cabinet) with an enclosure ≥ IP 54, whereby no
condensation is permitted.
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4 CABLe seLeCtIon

➔ Use cables suitable for the type of operation and
complying with local regulations.
➔ Signal and control line for screw terminals
max. 2.5 mm 2
for spring force terminals max. 1.5 mm
(min. AWG 24, max. AWG 12).
➔ Do not route the device's cables in the same ca-
ble duct as frequency converter cables or cables
emitting strong fields.
➔ External electrical interference must be avoided.
Ionization, UV, C70xx cable
➔ The flame signal is adversely affected by EMC in-
fluences.
➔ Cable lengths of 50 m are acceptable if there is
no EMC interference.
➔ As the length of the ionization/UV/C70xx cable
increases, the flame signal intensity may drop off.
➔ Lay cables individually (with low capacitance)
and, if possible, not in a metal conduit.

5 WIRInG

1 Disconnect the system from the electrical power
supply.
➔ Screw terminals or spring force terminals are
available for the FDU:
Screw terminal, Order No.: 74924898.
Spring force terminal, Order No.: 74924899.
2 Wire as shown on the connection diagram – see
page 4 (5.1 Connection diagram).
➔ Ensure a good PE (ground) wire connection
between burner ground (terminal 8) on the FDU
and the burners.
➔ Ensure that a clean sinusoidal voltage is applied
to the FDU so as to avoid mains voltage errors
due to irregularities in the mains voltage.
EN-3
(min. AWG 24, max. AWG 12),
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