15 DECOMMISSIONING THE HYDRAN 201TI
The Hydran 201i system is designed to be permanently installed for autonomous
operation on a transformer. If however, the Hydran 201i must be decommissioned, the
procedure to be followed is described in this chapter.
15.1 Powering Off
The following procedure must be carried out thoroughly.
Failure to do so may result in property damage, personal injury
and/or death.
The decommissioning of the Hydran 201Ti must be executed by
trained service personnel only.
1. Switch OFF the circuit breaker to which the power cable of the Hydran 201i
system is connected.
2. Verify, with a voltmeter, there is no AC or DC voltage on the power cable.
3. Disconnect the power cable from the circuit breaker.
4. Remove the cover of the Hydran 201i system to be decommissioned.
5. Verify there is no AC or DC voltage on the mains supply terminals of the unit.
6. Verify there is no AC or DC voltage on the cables connected to the analog inputs,
analog outputs or/and digital inputs if present.
7. Verify there is no AC or DC voltage on the cables connected to the alarm relays.
8. Verify there is no AC or DC voltage on the cable connected to the RS-485
terminals.
9. If any of the cables is still fed by an external source, identify and isolate the
source.
15.2 Cable Disconnection
After verification that there is no AC or DC voltage on all cables connected to the Hydran
201Ti unit, proceed as following:
1. Disconnect the power supply cable and remove this cable.
2. Disconnect the cables from the analog inputs, analog outputs or/and digital
inputs if installed and remove these cables.
3. Disconnect the cable from the alarm relays terminals and remove this cable.
4. Disconnect the cable from the RS-485 terminals and remove this cable.
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