Watlow Series SD PID Profiling Controller - Manual (Page 17)

Wa t l o w S e r i e s S D • 1 5 • C h a p t e r 2 I n s t a l l a n d W i r e
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Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this con-
troller to a power source and to
electrical sensors or peripheral
devices. Failure to do so may
result in damage to equipment
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 options requires
use of an R.C. suppressor.
Watlow carries the R.C. suppres-
sor 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 2 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.
2
3
4
3
4 normally open
common
Internal Circuitry
COM.
N.O.
Solid-state Relay
3
4
Solid-state Switch
Figure 15b — Output 2 Switched DC
SD_ _ - _ _ C _ - _ _ _ _
• Maximum supply current 30 mAÎ (dc).
• Supply voltage 6 to 12VÎ (dc).
• Not recommended for switching mechanical relays.
• Output supplies power.
2
3
4
dc+ 3
dc- 4
Internal Circuitry
dc-
dc+
6 to 12V Î (dc)
Load
Switched DC
-
+
3
4
Figure 15c — Output 2 EIA/TIA-485
SD_ _ - _ _ U _ - _ _ _ _
• Isolated [50VÎ (dc)]
• Half duplex
• For more communications information, see the Features chapter.
2
3
4
T+/R+ 3
T-/R- 4