Section 5: Maintenance; Periodic Checks; 1: I/O Modules; 2: Local Power Supplies - Honeywell H-S81-HS Manual

Equipment and system maintenance must be carried out at regular intervals by qualified personnel.
The frequency of periodic maintenance depends on the system type and the requirements resulting
from the risk analysis.

5.1 Periodic checks

Follow the operations below in order:
5.1.1 I/O Modules
The Safety Bus system modules do not require particular maintenance. In any case, it is advisable
to periodically make sure the wires from the field are firmly clamped to the connection terminals.
Also check the quality of the communication link using the diagnostic cycle as described in
Section 4.6.2.
5.1.2 Local Power Supplies
The local power supplies contain two dry batteries that supply power to the modules in case of a
main power supply cutoff. These batteries have a shelf life of approximately 4 years. It is advisable
to check the batteries every six months, following manufacturer instructions, to determine their
efficiency. Disconnect the primary power of the local power supplies and make sure that a no pri-
mary power signal is sent to the control panel. Once done, restore the primary power. Disconnect
the local power supply batteries make sure that a battery failure signal is sent to the control panel.
Once done, reconnect the batteries. Also, from the control panel diagnostic cycle, check the leakage
to ground dispersion level measured by the SB-SIM-GM modules. The measured value must be
lower than ±20%.
5.1.3 Field Devices
For field device maintenance (gas sensors, flame sensors, smoke detectors, etc.) refer to the specific
product manuals.
5.1.4 Functional Tests
Check the module actuation logic, in particular the extinguishing system logics.
NOTE: The functional tests must be carried out by a qualified technician, adopting the proper
safety measures so as to avoid accidental discharge of the extinguishing agent or the activation of
outputs that can cause damage to the environment or people.

5.2 Replacing a Module

All the Safety Bus system modules can be hot-swapped. To replace a module, follow the opera-
tions in the order below:
1. Disconnect the removable TB1 power supply terminal block.
2. Disconnect the removable TB2 communication ring terminal block.
3. Disconnect the removable TB3-TBx field element terminal blocks.
4. Remove the module that needs replacing and fit the new one.
5. Connect the removable TB1 power supply terminal block.
6. Connect the SB-PRG programmer to the TB2 terminal.
Safety Bus Manual — P/N LS10177-000HI-E:B 02/21/2019

Section 5: Maintenance

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