Watlow Series SD • 16 • Chapter 2 Install and Wire
Figure 16a — Output 3 Mechanical Relay
SD_ _ - _ _ _ E - _ _ _ _
• Form A contact
• 5 A, resistive
• 125 VA pilot duty, 120/240VÅ (ac), inductive
• See Quencharc note.
• 240VÅ (ac) maximum.
• 30VÎ (dc) maximum.
• For use with ac or dc.
• Minimum load current 10 mA
• Output does not supply power.
12 common
13 normally open
14 normally closed
12
13
14
Internal Circuitry
COM.
N.O.
Mechanical Relay
12
13
N.C.
14
Figure 16b — Output 3 Solid-state Relay
SD_ _ - _ _ _ K - _ _ _ _
• Form A contact
• 0.5 A maximum, resistive
• 20 VA pilot duty, 120/240VÅ (ac), inductive
• See Quencharc note.
• 24 to 240VÅ (ac).
• Minimum load current 10 mA
• Maximum leakage current 100 µA
• Not for use with direct current (dc).
• Output does not supply power.
12 common
13 normally open
12
13
14
Internal Circuitry
COM.
N.O.
Solid-state Relay
12
13
Solid-state Switch
Figure 16c — Output 3 Switched DC
SD_ _ - _ _ _ C - _ _ _ _
• Maximum supply current 30 mAÎ (dc).
• Supply voltage 6 to 12VÎ (dc).
• Not for switching mechanical relays.
• Output supplies power.
12 dc +
13 dc -
14 common
12
13
14
Internal Circuitry
dc-
dc+
6 to 12VÎ (dc)
Load
Switched DC
-
+
12
13
ç
Warning:
Use National Electric (NEC)
or other country-specific
standard wiring and safety
practices when wiring and
connecting this controller to
a power source and to elec-
trical sensors or peripheral
devices. Failure to do so may
result in damage to equip-
ment and property, and/or
injury or loss of life.
Quencharc Note:
Switching pilot duty inductive
loads (relay coils, solenoids,
etc.) with the mechanical relay
or solid-state relay output op-
tions requires use of an R.C.
suppressor.
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 main-
tained from input to output
when using switched DC or
analog process outputs.
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