Watlow Series 922 - Manual (Page 28)

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WATLOW Series 922 User's Manual How to Install and Wire, Chapter 4
Series 922 Power Wiring
Wire Power
WARNING:
To avoid electric
shock, connect the
chassis ground
terminal to "Earth
Ground."
CAUTION:
Remove the short
green ground
jumper on the back
of the 922 (T-21) if
your control is
mounted in a metal
panel connected to
safety (chassis)
ground. Removing
the jumper will
prevent ground
loops
OR
leave the short
green ground
jumper in place if
the Series 922 case
is not connected to
safety (chassis)
ground.
Figure 16 -
Series 922 Power
Wiring Diagram.
WARNING:
To avoid potential
electric shock, use
National Electric
Code safety prac-
tices when wiring &
connecting this unit
to a power source
and to electrical
sensors or periph-
eral devices.
Chassis
GND
Chassis
GND
L1 (Hot)
L2 (Hot)
Earth
Ground
L1 (Hot)
L2 (Hot)
Earth
Ground
Green
GND
Wire
Green
GND
Wire
17
18
19
20
21
22
17
18
19
20
21
22
NOTE:
For 230VAC,
jumper 18 to 19
NOTE:
For 115VAC,
jumper 17 to 19
and jumper 18 to 20
Remote Hold Remote Hold
External Event External Event
24 24
23 23
Input
Input
Connect AC power lines and jumper wires to the power supply terminal strip of
the Series 922. Study the strip connections carefully before beginning. Be
sure to use these jumpers on the power supply terminal strip. For 230VAC,
jumper 18 to 19. For 115VAC, jumper 17 to 19 and jumper 18 to 20.
All wiring and fusing must conform to the National Electric Code and to any
locally applicable codes also.
Before applying power, open the Series 922 and set DIP Switch #1 in the "ON"
position for a Cold Start. Replace the control chassis in the enclosure. Apply
power to the unit. (This clears all previously entered information from the 922;
it is a "clean" or "cold" start).
Now remove power again, open the unit, and set Switch #1 to OFF. (This
makes the next start a "warm" one, retaining all subsequently entered informa-
tion in the processor's memory). Close the 922.
When applying power without sensor inputs on the Signal Conditioner terminal
strip, or if the control is not configured for the correct sensor input, the Series
922 alternately flashes from SYSTEM to ER1 00XX. This is an error code
indicating an open sensor. These are normal displays for a unit without sen-
sors or improper configuration.
For more information on remote hold and external event input refer to page 38.