Watlow Series SD Limit - Manual (Page 18)

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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 16a — Output 3 Open Collector
SD_ L - _ _ _ C - _ _ _ _
• Maximum current sink 250 mAÎ (dc).
• Maximum supply voltage 42VÎ (dc).
• For inductive loads, see Quencharc note.
• Output does not supply power.
Figure 16b — Output 3 Process
SD_ L - _ _ _ F - _ _ _ _
• Analog output scalable from 0 to 10VÎ (dc) or 0 to 20 mAÎ (dc).
• Load capability: voltage, 1 k
Ω
minimum; current, 800
Ω
maximum.
• Output supplies power.
• Cannot use voltage and current output at the same time.
12 amps +
13 volts +
14 com -
12
13
14
Internal Circuitry
dc-
COM.
dc+
42V (dc) maximum
Open Collector
12
13
14
Load
-
+
Power
Supply
- +
Class 2 power source
required for agency
compliance.
13 open collector
14 common
12
13
14
12 dc+
Wa t l o w S e r i e s S D L i m i t
■
16
■
C h a p t e r 2 I n s t a l l a n d W i r e