Pre-Alarms

General Description

EcoStruxure Power Commission Software enables the configuration of the following 3 pre-alarms:

long-time protection pre-alarm (PAL Ir)
ground-fault protection pre-alarm (PAL Ig)
earth-leakage protection pre-alarm (PAL IΔn)

Each alarm has a corresponding alarm code:

PAL Ir = 1013
PAL Ig = 1014
PAL IΔn = 1015

Each alarm has a priority level that manages the alarm display on the FDM121 display:

no priority = N/A (not affected)
low priority = 1. No alarm display on the FDM121 display.
medium priority = 2. The FDM121 display LED is steady ON.
high priority = 3. The FDM121 display LED blinks and a pop-up screen informs the user that the alarm is active.

Refer to the ComPact NSX MicroLogic 5/6/7 Trip Units - User Guide Related Documents for more information regarding the relationship between alarm priority and FDM121 display.

The pre-alarms registers describe the settings of the pre-alarms:

Address	Register	Description
0x19F9–0x1A02	6650–6659	Long-time protection pre-alarm (PAL Ir)
0x1A03–0x1A0C	6660–6669	Ground-fault protection pre-alarm (PAL Ig)
0x1A0D–0x1A16	6670–6679	Earth-leakage protection pre-alarm (PAL IΔn)

Long-Time Protection Pre-Alarm (PAL Ir)

A read request of 10 registers is necessary to read the long-time protection pre-alarm parameters.

Address	Register	RW	X	Unit	Type	Range	A/E	Description
0x19F9	6650	R	–	–	INT16U	–	A/E	The MSB gives the activity of the alarm: 0 = On, 1 = Off. The factory setting is 0 (On). The LSB gives the priority of the alarm: N/A, 1, 2, or 3. The factory setting is 2 (medium priority).
0x19FA	6651	–	–	–	–	–	–	Reserved
0x19FB	6652	R	1	%	INT16	⁽¹⁾	A/E	% of Ir pick-up value. The factory setting is 90.
0x19FC	6653	–	–	–	–	–	–	Reserved
0x19FD	6654	R	1	s	INT16U	1	A/E	Pick-up time delay (fixed to 1 s)
0x19FE	6655	R	1	%	INT16	⁽¹⁾	A/E	% of Ir drop-out value. The factory setting is 85.
0x19FF	6656	–	–	–	–	–	–	Reserved
0x1A00	6657	R	1	s	INT16U	1	A/E	Drop-out time delay (fixed to 1 s)
0x1A01–0x1A02	6658– 6659	–	–	–	–	–	–	Reserved
(1) For distribution application, the range is 40–100. For motor application, the range is 10–95.

Ground-Fault Protection Pre-Alarm (PAL Ig)

A read request of 10 registers is necessary to read the ground-fault protection pre-alarm parameters.

Address	Register	RW	X	Unit	Type	Range	A/E	Description
0x1A03	6660	R	–	–	INT16U	–	A/E	The MSB gives the activity of the alarm: 0 = On, 1 = Off. The factory setting is 0 (On). The LSB gives the priority of the alarm: N/A, 1, 2, or 3. The factory setting is 2 (medium priority).
0x1A04	6661	–	–	–	–	–	–	Reserved
0x1A05	6662	R	1	%	INT16	40–100	A/E	% of Ig pick-up value. The factory setting is 90.
0x1A06	6663	–	–	–	–	–	–	Reserved
0x1A07	6664	R	1	s	INT16U	1	A/E	Pick-up time delay (fixed to 1 s)
0x1A08	6665	R	1	%	INT16	40–100	A/E	% of Ig drop-out value. The factory setting is 85.
0x1A09	6666	–	–	–	–	–	–	Reserved
0x1A0A	6667	R	1	s	INT16U	1	A/E	Drop-out time delay (fixed to 1 s)
0x1A0B–0x1A0C	6668–6669	–	–	–	–	–	–	Reserved

Earth-Leakage Protection Pre-Alarm (PAL IΔn)

A read request of 10 registers is necessary to read the earth-leakage protection pre-alarm parameters.

Address	Register	RW	X	Unit	Type	Range	A/E	Description
0x1A0D	6670	R	–	–	INT16U	–	E	The MSB gives the activity of the alarm: 0 = On, 1 = Off. The factory setting is 0 (On). The LSB gives the priority of the alarm: N/A, 1, 2, or 3. The factory setting is 2 (medium priority).
0x1A0E	6671	–	–	–	–	–	–	Reserved
0x1A0F	6672	R	1	%	INT16	50–80	E	% of IΔn pick-up value. The factory setting is 90.
0x1A10	6673	–	–	–	–	–	–	Reserved
0x1A11	6674	R	1	s	INT16U	1	E	Pick-up time delay (fixed to 1 s)
0x1A12	6675	R	1	%	INT16	50–80	E	% of IΔn drop-out value. The factory setting is 85.
0x1A13	6676	–	–	–	–	–	–	Reserved
0x1A14	6677	R	1	s	INT16U	1	E	Drop-out time delay (fixed to 1 s)
0x1A15– 0x1A16	6678– 6679	–	–	–	–	–	–	Reserved