Watlow Series SD31 PID with Optional Countdown Timer - Manual (Page 11)

Wa t l o w S e r i e s S D 3 1
■
9
■
C h a p t e r 2 I n s t a l l a n d W i r e
Figure 9a — Output 1 Switched DC
SD31 - _ C _ _ - _ _ _ _
• Supply current 30 mA Î (dc) maximum
• Supply voltage 6 to 12V Î (dc)
• Not recommended for switching mechanical relays
• Output supplies power
Figure 9b — Output 1 Process
SD31 - _ F _ _ - _ _ _ _
• Analog output is scalable between 0 to 10V Î (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
Figure 9c — Output 2 Mechanical Relay
SD31 - _ _ J _ - _ _ _ _
• Form A contact
• 2 A, resistive
• 125 VA pilot duty, 120/240V Å (ac), inductive
• See Quencharc note
• 240V Å (ac) maximum
• 30V Î (dc) maximum
• 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
4
8
5
6
7
volts+ 6
com- 7
amps+ 5
Internal Circuitry
dc-
dc+
Load
Switched DC
-
+
5
6
4
56
5
6 dc+
dc-
ç
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 re-
sult in damage to equipment and
property, and/or injury or loss of
life.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
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.
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.