Table 3.1 mGARD-100 Trip Levels vs. Turns through ZSCS.
30mA (L, L, L, L)
30mA
15mA
10mA
2.5mA
2mA
40mA (L, L, L, R)
40mA
20mA
14.3mA
5mA
4mA
60mA (L, L, R, L)
60mA
30mA
20mA
7.5mA
6mA
90mA (L, L, R, R)
90mA
45mA
30mA
12.5mA
10mA
150mA (L, R, L, L)
150mA
75mA
50mA
25mA
20mA
250mA (L, R, L, R)
250mA
125mA
83.3mA
30mA
24mA
400mA (L, R, R, L)
400mA
200mA
133.3mA
37.5mA
30mA
600mA (L, R, R, R)
600mA
300mA
200mA
52.5mA
42mA
900mA (R, L, L, L)
900mA
450mA
300mA
75mA
60mA
1500mA (R, L, L, R)
1500mA
750mA
500mA
125mA
100mA
2500mA (R, L, R, L)
2500mA
1250mA
833.3mA
150mA
120mA
4A (R, L, R, R)
4A
2A
1.33A
250mA
200mA
6A (R, R, L, L)
6A
3A
2A
600mA
480mA
9A (R, R, L, R)
9A
4.5A
3A
750mA
600mA
10A (R, R, R, L)
10A
5A
3.33A
1.05A
840mA
12A (R, R, R, R)
12A
6A
4A
1.5A
1.2A
dip setting
1 turn
2 turns
3 turns
4 turns
-Applies to both internal and external CT
5 turns
3.3 INDICATION
There is one green LED on the front of the mGARD-100:
LED Off:
No control voltage or mGARD-100 defective
LED Slow Flashing:
Normal, control voltage on
LED Fast Blinking:
Ground Fault Trip
LED Steady On:
Control voltage too low or mGARD-100 defective
MGARD-SYM REMOTE INDICATOR
The mGARD-SYM is a remote display indicator that is used in conjunction with I-Gard relays. The indicator has the
capability to interconnect and work with up to 50 relays including the mGARD-100 relay in a bus network topology
and provides detailed device status information.
As shown in Figure 3.0, the display has a 4-line screen that shows a list of connected devices. A device can be
selected and viewed in detail. The relay mode, delay and trip level settings can be viewed (but not altered). The reset
and test functions can also be performed directly from the display.
Fault levels are displayed as a percentage of the selected pickup (trip) current level. If the trip level is 1 Amp
and there is a 500 mA fault current, the reading on the display will appear as 50%. Screen navigation is done
using a 4-button interface. The menus are displayed on the right side of the LCD; the left side is reserved for
viewing relay information.
To properly display current levels on the mGARD-SYM, the trip levels can be set to match to a 100:1 or 1000:1
interposing ZSCS using the mGARD-SYM interface.
