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2.3
F
C
RONT
OVER
As standard the relay is supplied with a transparent front cover see Figure 2-2. The front cover is used to secure
the relay assembly in the case.
If access is required to view the menus without removing the cover, an alternative transparent cover with push
buttons may be ordered. With the transparent front cover in place the user only has access to the
TEST/RESET
buttons, via blue push buttons, allowing all areas of the menu system to be viewed, but
preventing setting changes and control actions. The only 'action' that is permitted is to reset the Fault Data
display, latched binary outputs and LEDs by using the TEST/RESET
2.4
P
S
OWER
UPPLY
Relay PSU options allow the relay to be directly connected to dc system rated from 24V to 60V or 80 to 250V.
The 80- 250Vdc PSU can also be used with 115V AC supplies. For consistency and safety it is advised that AC
connections to the auxiliary supply are made with the Live connection to the +ve terminal and Neutral connection
to –ve. The device will operate normally for reversed polarity DC auxiliary voltages.
In the event of the station battery voltage level falling below the relay minimum operate level the PSU will
automatically switch itself off and latch out – this prevents any PSU overload conditions occurring. The PSU is
reset by switching the auxiliary supply off and on.
To ensure that the motor is protected during all operational stages it is recommended that the relay is energised
prior to the motor being started i.e. that the relay is connected to a permanent auxiliary supply.
2.5
O
PERATOR
The operator interface is designed to provide a user-friendly method of controlling, entering settings and retrieving
data from the relay.
©2014 Siemens Protection Devices Limited
U
(PSU)
NIT
I
/ F
NTERFACE
ASCIA
Figure 2-2
Chapter 1) 7SR17 Rho Description Of Operation
button.
7SR17 in E4 Case
and
Page 15 of 78
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