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Building Technologies Basic Documentation LME7... CC1P7105enr
1 Safety notes 17.04.2018
1.3 Installation notes
∂ Always run the high-voltage ignition cable separate from the unit and other cables
while observing the greatest possible distance
∂ Do not mix up live and neutral conductors
∂ Install switches, fuses and earthing in compliance with local regulations
∂ The connection diagrams show the burner controls with earthed neutral conductor.
In networks with nonearthed neutral conductor and ionization current supervision,
terminal X10-05 pin 1 must be connected to the earth conductor. It must be made
certain that local regulations are complied with (e.g. protection against electric
shock hazard) since AC 230 V (60 Hz) mains voltage produces peak leakage
currents of 2.7 mA
∂ Make certain that the maximum permissible current rating of the connection
terminals is not exceeded
∂ Make certain that strain relief of the connected cables is in compliance with the
relevant standards
∂ Do not feed external mains voltage to the control outputs of the unit. When testing
the devices controlled by the burner control (fuel valves, etc.), the LME7 must not
be connected to the units
∂ Mains power must always be supplied via L and N. This means that no potential
differential must exist between the neutral conductor N and protective earth PE
∂ Make certain that strain relief of the connected cables is in compliance with the
relevant standards (e.g. as per DIN EN 60730 and DIN EN 60335)
∂ Ensure that spliced wires cannot get into contact with neighboring terminals. Use
adequate ferrules. If this is not observed, there is a risk of loss of safety functions or
a risk of electric shock
∂ For protection, the burner manufacturer must fit dummy plugs to unused LME7
terminals
∂ The connectors of the connecting cables for the LME7, may only be removed or
exchanged when the plant is shut down (all-polar disconnection), since the
connections (especially BCI interface) does not provide safe separation from mains
voltage
∂ The mechanical coupling between the actuators and the controlling elements for
fuel and air, or any other controlling elements, must be rigid
∂ Signal cable AGV50 from LME7 to AZL2 or from LME7 to OCI410:
Since the BCI has no safe separation from mains voltage, the signal cable AGV50
between LME7 and AZL2, or LME7 and OCI410, must conform to certain
specifications. Siemens has specified the signal cable AGV50 for use under the
burner hood (see Technical data). When using signal cables of other manufacture,
Siemens’ requirement will not necessarily be met
∂ Do not lay the signal cable AGV50 from the LME7 to the AZL2 together with other
cables; use a separate cable
∂ Service operation with a longer signal cable from LME7 to AZL2, or from LME7 to
OCI410:
If a longer signal cable is required for service work for example (short-time,
<24 hours), note that above usage under the burner hood no longer applies and, for
this reason, the signal cable can be subjected to increased mechanical stress. In
that case, extra cable sheathing is required
∂ Both the signal cable AGV50 and the AZL2 must be shipped and stored so that no
damage due to dust and water can occur when used in the plant later on
∂ The AZL2 must be used in a dry and clean environment
∂ Check the connecting lines of the air pressure switch for short-circuits
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