Issue 1
4
5.6 Variable RCD ELR-3C
The RCD and Bypass switch should only be adjusted or switched by an electrician with the
appropriate test equipment.
ELR-3C Earth Leakage Relay Description
Its wide setting ranges allows user to select the tripping current, in order that the contact voltage
values are maintained below 50V as required by the CEI 64-8Standard.
This is also the suitable answer for a proper selectivity, whenever
there are other ELR’s or/and RCD’s
downstream or upstream in the line to be protected.
An outstanding characteristic of the present relays, is the permanent control of the Toroidal - ELR
circuit.
Its interruption brings along the immediate trip of the protection. This allows to identify the anomaly,
without waiting to the periodical control, made with the Test push button.
The instrument, fitted with filters at the input circuits, is practically immune to external disturbances,
so as the pulse currents with dc components, complying with the requirements of VDE 0664 and
project IEC 23 Standards.
The ELR-3C has the possibility of an automatic or manual reset, selectable by a micro switch and to
protect the settings by its sealable transparent front cover.
1) Current tripping setting potentiometer.
2) Tripping time setting potentiometer.
3) Micro switches for programming:
-a In position 1 automatic reset, In position 0
manual reset.
-b Selection of the multiplying constant.
Tripping time, in position 1 K=10 in position 0
K=1
c,d Selection of the multiplying constant of
tripping current:
With c d in position 0 K=0.1
With c in position 1, d in position 0 K=1
With c,d in position 1 K=10
4) Push button for Test.
5) Push button for manual reset.
6) Signalling green LED for Aux. Supply
presence.
7) Signalling red LED for relay tripped.
8) Terminals for Aux. Supply.
9) Output terminals for end relays
10) Connection terminals to T/T CT-1
5.7 Hard wire terminals
Do not attempt to work on the hard wire terminals while the set is running, hard wire door is fitted with a
magnetic switch to shut down generator if door is opened.
The generator is fitted with hard wire terminals which are located under the Circuit breakers, the terminals are
clearly marked for 400Volt. They can be accessed by either drilling the steel gland plate or passing the cables
through the rubber gland plate. If cables are passed through the rubber gland plate they must be secured with
the cable clamp to prevent strain on terminals. The gland plate should be re-fitted prior to running generator.
5.8 Remote start terminals
The generator is equipped with a pair of normally open contacts which will start the generator when closed.
5.9 Long term storage
For storage or long periods of inactivity, Stephill Generators recommend the following:
Generators should be stored with oil filled to the correct capacity; Storage periods of 18 months and over may
require special lubricants and treatments. If so please seek further advice from the engine manufacturer.
Before the generator is used after long term storage, all fuels and oils should be replaced.
Generator mounts, pipes and hoses should be checked to ensure that they are un-perished following
extended periods of storage.
The generator should be stored in a clean dry area, ideally having a reasonable constant ambient
temperature, and ideally not below freezing. The battery isolator switch should be switched off.
