Krom Schroder BCU 46 Series Operating Instructions Manual page 6

▷ Use plastic cable glands/conduit couplings with
multiple cable grommet. These can be detached
with the plug-in connection terminals.
▷ Do not supply voltage to the outputs.
▷ A short-circuit on the outputs causes one of the
replaceable fuses to trip.
▷ Do not set the remote reset so that it operates
(automatically) in cycles.
▷ Wire the safety circuit inputs via contacts (relay
contacts) only.
▷ The limiters in the safety interlock (e.g. safety
temperature limiter, emergency stop) must iso-
late terminal 35, as well as the optional safety-
relevant inputs, e.g. at terminals 36 to 41, if these
are parameterized, from the voltage supply. If the
safety interlock is interrupted, the display shows
a blinking 51 as a warning signal and all of the
BCU's gas valve outputs are disconnected from
the electrical power supply.
▷ Connected control elements must be equipped
with protective circuits in accordance with the
manufacturer's instructions. The protective circuit
prevents high voltage peaks which can cause
malfunctioning of the BCU.
▷ Install the ignition cable in the BCU in the desig-
nated cable duct 1 and feed it out of the BCU on
the shortest possible route via the cable gland .
1
▷ Observe the maximum duty cycle for the ignition
transformer (see manufacturer's instructions).
Adjust the minimum pause time t
eter A062) correspondingly, if required.
▷ All functions of the inputs at terminals 1 to 7
and 35 to 41, as well as of contacts 80 to 82,
85 to 87, 90 to 92 and 95 to 97, depend on
parameters I050 to I074.
1 Disconnect the system from the electrical power
supply.
 Before wiring, ensure that the yellow parameter
chip card has been inserted in the BCU.
▷ Screw terminals or spring force terminals are
available for the BCU:
Screw terminals, Order No. 74924876,
spring force terminals, Order No. 74924877.
3 Wire as shown on the connection diagram, see
from page 7 (Connection diagram).
4 After wiring, close the housing cover again and
tighten the cover screws to 2.4 Nm.
2
(param-
BP
GB-6