Rosemount 2120, Reference Manual

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Reference Manual
00809-0100-4030, Rev DA
June 2007
Rosemount 2120
2-7
Electrical Installation
Isolate supply before connecting the switch or removing the electronics.
The functional earth terminal must be connected to an external earthing system.
2120 Direct Load Switching
• Direct load switching (2-wire, Red label)
NOTE:
DPST = ‘Double Pole, Single Throw’ (on/off) switch - must be fitted for safe disconnection of
the power supply. Fit the switch as near to the 2120 as possible. Keep the switch free of
obstructions. Label the switch to indicate that it is the supply disconnection device for the
2120.
RELAY CONNECTION WARNING:
The Rosemount 2120 requires a minimum current of 3mA, which continues to flow when the
2120 is ‘off’. If selecting a relay to wire in series with the 2120, the user must ensure that the
drop-out voltage of the relay is greater than the voltage which will be generated across the
relay coil when 3mA flows through it.
Direct Load
Switching
WARNING
Isolate Supply
Before Removing
OPERATION MODE
Dry On Mode
Dry
Wet
Wet On Mode
Dry
Wet
Dry On Wet On
Seconds Delay
0.3 0.3
3
30
10
1
3
30
10
1
1 2 3
LINE LOAD
PE
(Ground)
Neutral
Live
0V
+V
Fuse 2A(T)
R
I
L
R = External load (must be fitted)
R = Charge externe (impératif)
R = Externe Last (muß installiert sein)
R = Extern last (måste monteras som visas)
R = Carga exterior (debeinstalarse)
R = Externe belasting (moetaangesloten zijn)
R = Z ewnetrzne obciazenie (musi byc podlaczone)
U = 20 - 264V ~ (ac) (50/60Hz)
I
OFF
< 3mA
I
L
= 20 - 500mA
î = 5A, 40ms
U = 20 - 60V (dc)
I
OFF
< 3mA
I
L
= 20 - 500mA
î = 5A, 40ms
DPST
=Load On
= Load Off