12
Chapter 2 Installation
Input / Output ports options
On board Digital Inputs
The
EM720
is equipped with four fast Dry contact detector – Digital Inputs
4DI
unit.
The
4DI
unit is terminated with a nine-pin width pluggable terminal block which connects eight terminals
only – Auxiliary Terminal Block as described below
TB
P
IN
N
UMBER
S
IGNAL
1 D
IN
1
2 C
OMMON
3 D
IN
2
4 C
OMMON
5 D
IN
3
6 C
OMMON
7 D
IN
4
8 C
OMMON
9 N
OT
C
ONNECTED
Table 2: Auxiliary Terminal Block
Four optically isolated digital inputs are provided for status monitoring and external synchronization of
power demand period and time. Dry contacts may be connected to these inputs, as shown in
Figures 14
.
For ratings, see
Appendix: Technical Specifications
.
Figure 13: Digital Input Connection
