Watlow Series SD Limit - Manual (Page 15)

Wa t l o w S e r i e s S D L i m i t
■
13
■
C h a p t e r 2 I n s t a l l a n d W i r e
Figure 13a — 4 to 20 mA Process Input
(all model numbers)
• Input impedance 100
Ω
, dc only.
• Limit does not supply power for the current loop.
Figure 13b — Output 1 Mechanical Relay
SD_ L - _ J _ _ - _ _ _ _
• 2 A, Form A.
• 240VÅ (ac) maximum.
• 30VÎ (dc) maximum.
• See Quencharc note.
• For use with ac or dc.
• Minimum load current 10 mA
• Output does not supply power.
Figure 13c — Output 2 Mechanical Relay
SD_ L - _ _ J _ - _ _ _ _
• 2 A; Form A.
• 240VÅ (ac) maximum.
• 30VÎ (dc) maximum.
• See Quencharc note.
• For use with ac or dc.
• Minimum load current: 10 mA
• Output does not supply power.
Internal Circuitry
COM.
N.O.
Mechanical Relay
3
4
2
3
4
3
4 normally open
common
Internal Circuitry
COM.
N.O.
Mechanical Relay
5
6
4
56
normally open 6
common 5
6
8
9
10
11
8
11
+
-
ç
WARNING: Process input may
not have sensor break protec-
tion. Outputs can remain full on.
Check your input settings.
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this limit
to a power source and to electri-
cal sensors or peripheral de-
vices. Failure to do so may re-
sult in damage to equipment and
property, and/or injury or loss of
life.
Quencharc Note:
Switching inductive loads (relay
coils, solenoids, etc.) with the
mechanical relay, switched dc or
solid-state relay output options
requires use of an R.C. suppres-
sor.
Watlow carries the R.C. sup-
pressor Quencharc brand name,
which is a trademark of ITW
Paktron. Watlow Part No. 0804-
0147-0000.
Spring clamp wiring connector
note:
To insert the wire, push the wire
into the desired connection num-
ber, and it should automatically
lock into place. To remove the
wire, press and hold the orange
release tab with a small screw-
driver. Pull the wire out of the
connection. Solid or tinned wire
recommended
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.