Watlow Series SD Limit - Manual (Page 17)

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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.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
Figure 15a — Output 3 Mechanical Relay
SD_ L - _ _ _ E - _ _ _ _
• 5 A; Form C.
• 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 15b — Output 3 Solid-state Relay
SD_ L - _ _ _ K - _ _ _ _
• 0.5 A maximum, Form A.
• 24 to 240VÅ (ac).
• See Quencharc note.
• Minimum load current 10 mA
• Maximum leakage current 100 µA
• Not for use with direct current (dc).
• Output does not supply power.
Figure 15c — Output 3 Switched DC
SD_ L - _ _ _ C - _ _ _ _
• Maximum supply current 30 mAÎ (dc).
• Supply voltage 6 to 12VÎ (dc).
• Not for switching mechanical relays.
• Output supplies power.
Internal Circuitry
dc-
dc+
6 to 12V (dc)
Load
Switched DC
-
+
12
13
12 dc +
13 dc -
14 common
12
13
14
Internal Circuitry
COM.
N.O.
Solid-state Relay
12
13
Solid-state Switch
12 common
13 normally open
12
13
14
Internal Circuitry
COM.
N.O.
Mechanical Relay
12
13
N.C. 14
12 common
13 normally open
14 normally closed
12
13
14
Wa t l o w S e r i e s S D L i m i t
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C h a p t e r 2 I n s t a l l a n d W i r e