Watlow Series 93 - Manual (Page 13)

W a t l o w S e r i e s 9 3 I n s t a l l a n d W i r e ■ 2 . 7
Figure 2.7a – Switched DC
93_ _- 1 C _ _- 00 _ _
Figure 2.7b – 4-20mA Process
93_ _- 1 F_ _- 00 _ _
Maximum load impedance: 800
Ω
External
Load 10
9
-
+
10
unregulated
V+
V—
9
Internal Circuitry
7 to 10V (dc)
94 Ω
External
Load 10
9
-
+
Install and Wire
NOTE:
Successful installa-
tion requires four
steps:
• Choose the con-
troller’s hardware
configuration and
model number
(Appendix);
• Choose a sensor
(Chapter Two and
Appendix);
• Install and wire
the controller
(Chapter Two);
• Configure the
controller (Chapters
Three, Four and
Five).
NOTE:
When an external
device with a non-
isolated circuit com-
mon is connected to
the 4-20mA or dc
output, you must use
an isolated or un-
grounded thermo-
couple.