FAQ – You ask, we answer


Safety lighting system displaying "earth fault (B)" after test mode or in battery mode. How can the fault be localised?

Earth fault (B) indicates that the fault was measured to the battery potential. If this fault occurs when in test/battery mode, it indicates a fault in the final circuit. If no faults are signalled on the circuit modules (fault LED flashing) when off (charging), the final circuits should be checked individually (e.g. by removing the circuit fuses). This check is undertaken in battery mode, not test mode.

All luminaires are permanently switched off and only activate when in test mode. What is wrong?

Safety lighting system is switched to off (charging). Switch system to operational using the operating mode selector switch.

Operating mode selector switch in door/front panel is in "operational" position but safety lighting system is still "off (charging)". What checks can be run?

Via MCT15, an external operating mode selector switch, the safety lighting system is set permanently to off (charging) via the LCD or web interface. Please check the local conditions (which of the three options is the operator using) to localise the fault.

MC-LM or SAM24 not detected. What could be wrong?

When installing/connecting the modules, the safety lighting system was not totally de-energised. De-energise safety lighting system in accordance with enclosed documentation, then restart and detect again.

Note: Only ever carry out installation work on the safety lighting system with the system de-energised.

Safety lighting system not triggering a function test. What factors block the function test?

Function test is blocked by the following factors:

a) Safety lighting system is in emergency mode (mains emergency mode mod. active (mains) or (battery mode)

  • The reason for the emergency mode must be localised and remedied. Also note the overrun times.

b) Battery fuse defective or removed

  • A defective or removed battery fuse must be replaced / inserted, then the fault can be acknowledged.

c) Battery voltage below 230V

d) Charging module performing fast charge

  • If the battery is flat or the charging module is in fast charge, you will need to wait for the necessary battery voltage to be reached.
Programming of circuits via LCD not saved. What is causing this?

Changes/programming cannot be saved in the “Guest” password level. Changes & programming can be saved after logging in with the right password. Your sales partner will provide the right password.

Note: Remember to use the right upper/lower case letters.

Flash sequence of MC-LM bus mains sensor indicates mains failure but circuits are not switching to mains emergency mode "mod. active (mains)". What could the problem be?

Circuits were not programmed accordingly. The MC-LM must be assigned to the individual circuits. Programming can be undertaken via the LCD or web interface.

Retrofitted circuit modules cannot be programmed. Why?

Retrofitted circuit module must be detected via LCD. This requires an appropriate password. Only once the circuit module has been detected and saved can this be programmed via the LCD or web interface

The safety lighting system is indicating "total current fault". What kind of fault is this?

During commissioning, a reference value was measured and saved for the discharge current. If the discharge current measured in a function test deviates too far from this reference value, the total current fault fault message is issued. A deviating discharge current may come about due to luminaires which are defective, replaced (e.g. light bulb replaced with LED luminaire), removed or added.

Note: The total current only has to be monitored with the MDC device type. All other systems have the option of individual luminaire monitoring.

Safety lighting system indicating "mod. active (mains) & critical circuit". Where may the fault lie?

The closed circuit loop (critical circuit) via potential-free mains sensors is interrupted, the safety luminaire device switches into mains emergency mode. Either a mains sensor has tripped (mains failure of corresponding low-voltage main distribution/general lighting distribution) or the closed circuit loop is not closed correctly. In this case, the closed circuit loop must be checked.

Note: For device types with CCIF, it is important that the diode and/or resistor is always present in the closed circuit loop. If the component is removed or not incorporated in the wiring during installation, the closed circuit loop’s evaluation cannot run.

Permanent light circuit remains switched off. Why?

Permanent light circuits can be switched via the switch query module (SAM24), MCT15 or the timer integrated in the safety lighting system. Please check programming and local conditions. Permanent light circuits switched via SAM or an MCT15 can then be found. If a timer is programmed, a (T) will appear next to the time in the safety lighting system’s LCD.

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