L2275
Emax UL
42/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
Table 4. Values selectable for K51/p1 trip unit
Event
Description
“ L preal. ”
Pr timing protection “L”
“ L timing ”
Timing protection “L”
“ S timing ”
Timing protection “S”
“ G timing ”
Timing protection “G”
“ G alarm ”
Alarm protection “G”
“ L trip ”
Opening by protection “L”
“ S trip ”
Opening by protection “S”
“ I trip ”
Opening by protection “I”
“ G trip ”
Opening by protection “G”
“ T trip ”
Opening by protection “T”
“ T >70°C ”
Internal temperature higher than 70°C
“ T >85°C ”
Internal temperature higher than 85°C
13.11.2
Watchdog
The PR112 unit provides some Watchdog functions able to guarantee correct management of any trip unit malfunctions.
In particular, the watchdog signal of the microprocessor is constantly monitored, generating an alarm signal when there is an operating anomaly
(LED lighting up and
µ
P Fault contact closure).
13.11.3
Self-test
The PR112 unit is able to monitor correct operation of:
•
Microprocessor and SA with the Trip Test function.
This is carried out by means of the TEST pushbutton on the front panel following enabling from the Test Menu: in the case of a positive result,
the power circuit breaker is opened.
This function is always guaranteed when there is self-supply (I>0.35 In single-phase) or auxiliary power supply.
•
User interfacing devices with the Self-test function.
This is carried out by means of selection from the Test Menu: in the case of a positive result, correct operation of the following is verified:
-
Display (all the pixel of the matrix light up)
-
LEDs (4 )
-
Magnetic Flags (4 or 5 for LSIG version)
-
Prealarm, Relay tripped and
µ
Pfault contacts
This function is guaranteed when there is an auxiliary power supply or in self-supply with at least 0.5 In single-phase: in the case of Warning or
Emergency, the test is immediately abandoned, always guaranteeing all the protection function.
By pressing the “RESET” key the test is interrupted.
In all cases where there is no self-supply and/or auxiliary power supply, the energy can be supplied from the accessory PR120/B power supply
unit (connected to the front test connector).
Following the instructions given under the “User interface” chapter, show on the display:
PR112 Tests
Heading
Trip Test : xxx
Select whether to enable the Trip Test function
Auto Test : xxx
Select whether to enable the Self-test function
13.11.4 Complex test of the trip unit
Using the PR010/T test unit (see par. 13.18.1) connected to the trip unit by means of the front multipin TEST connector, it is possible carry out
a complete series of tests.