3 . 2
■
W i r i n g
Wa t l o w S e r i e s 9 7
∫
WARNING:
To avoid potential
electric shock, use
National Electric Code
(NEC) safety practices
when wiring and
connecting this unit to a
power source and to
electrical sensors or
peripheral devices.
Failure to do so could
result in injury or death.
Wiring the Series 97
Wiring options depend on the model number. Check the terminal
designation stickers on either side of the controller and compare
your model number to those shown here and with the model
number breakdown on the inside back cover of this manual.
NOTE: Using the Diagnostics Menu (Factory Page) check
Output 1 Hardware through Output 4 Hardware,
[Oty1]
through
[Oty4]
. See Chapter Six for information about the
menu and range of settings for each output. These outputs may
differ from those listed for the model number on the controller
and described in this manual, indicating a customized hardware
setup.
Input-to-output Isolation
The Series 97 uses optical and transformer isolation between the
analog inputs and the controller outputs, including the
communications interface. This isolation provides a barrier to
prevent ground loops when using grounded sensors and/or
peripheral equipment.
Here is a breakdown of the isolation barriers:
•
Analog inputs 1 and 2 are grouped together.
•
Outputs 1 through 4 are grouped together. This does not
apply to Output 4 when it is configured for communications.
•
If Output 4 is configured for communications, it is isolated
from the the other inputs and outputs.
Figure 3.2 — Isolation blocks.
Input 1
Input 2
Output 1
Output 2
Output 3
Output 4 (unless Output 4 is used for communications)
Output 4 (if Output 4 is used for communications)
Isolation Blocks
There are no electrical connections between these blocks.
INPUT
OUTPUT
COMMUNICATIONS
