Installation
7100A User Manual
2-12
2.3.2.4. Alarm relay contact (alarm option) - DIG.IN Terminal
If one of the alarm options is fitted, a relay contact is available on the ‘ALARM’ terminal block,
between terminals 71 and 72 or 73 and 74 (see figure 2-10).
The type of contact (closed or open on alarm) is determined by the product code.
Contact switching capacity: 0.25 A (maximum 250 Vac or 30 Vdc).
Alarm
acknowledgement
connector
ALR
71
1
a
72
1b
DIG.IN 61 0
V
D
62
ACK
63 5
V
D
ANA
31
0V
A
32
RI
33 5
VA
HEAT
Acknowledgement by
contact or
push button
External user supply
for alarm acknowledgement
DIG.IN 61 0
V
D
62
ACK
63 5
V
D
0 V
+ 5 V
Alarm relay
contact
Figure 2-10 Typical alarm relay contact and external acknowledgement connections
2.3.2.5. Acknowledgement signal (ICO option)
With the ICO option, OverLoad and Partial or Total load failure alarms may be acknowledged with a +5
V signal by connecting a contact between terminal 63 (5VD internal) and an ACK logic input (terminal
62) available on the ‘DIG.IN’ terminal block.
An external 5 V supply may be used for this acknowledgement (see figure 2-10).
Note: The DLF alarm can also be reset with the ‘CHK/SET’ push button.
2.3.2.6. Connecting the reference neutral voltage - EXT Terminal
For any units from 125 A to 250 A, the neutral voltage of the supply network (
reference neutral
)
must be applied
to terminal
21
, marked
N
(
EXT
connector).
This connection must be protected by a
1 A
fuse (see figure 2-11).
Loss of the reference neutral connection causes an alarm (see Alarms section).
Figure 2-11 Connecting the supply neutral voltage
2.3.2.7. MSFU option, fuse blown contact - MSF Terminal
For any units from 125 A to 250 A, with the option MSFU a ontact is avalaible on the terminal MSF in
order to indicate fuse blown.
EXT
21
N
22
Neutral or Second
Phase connection
ANA
31 0V
A
32 RI 33 5V
A
To the network Neutal
Fuse 1 A
MSF
3a 3b
75 76
To fuse blowncontact
71A2_Installation_ENG_Iss3.qxp 1/09/06 16:14 Page 2-12
