Watlow Series 942 - Manual (Page 5)

Starting Out
Getting Started, Chapter 1
5
WATLOW Series 942 User's Manual
How to Open the 942
Before going further, open the Series 942 and pull the control chassis from its case.
Here's how:
The control chassis fastens to the case with a single standard screw located on the
Starting Out
LOCK
!
Figure 3 -
DIP Switch Location
and Orientation.
Hardware Lockout of
SETUP Parameters
Battery Discharge for
Storage 1
2
(Factory default is OFF)
Control Chassis - Top View
1 Hardware lockout of
Setup parameters
2 Battery backup of the
Run parameters
Three strip connector plugs, in the rear of the control chassis, feed power and
signals through the back of the case to the terminal strips. These plugs will let go
as you pull.
When removing the Series 942 control from its case, pull firmly but gently. When
returning the control to the case, be sure you have the top up to match the plugs
with the case. The 942 will not fit in the case upside down, but check to be sure it
is oriented correctly. Press the unit in firmly, then turn the front panel screw
clockwise to secure it. This insures proper electrical contact.
How to Set the DIP Switches
The Watlow Series 942 has a Dual In-line Package (DIP) switch inside the control
on the A007-1954 circuit board (middle board). The location of the board and
switch appear below. The switches are clearly numbered. When Switch #1 is ON,
the Setup parameters can be viewed but not changed. When Switch #2 is ON, it
provides battery backup of the Run parameters. When the control leaves the
factory, both switches are OFF.
NOTE:
The lithium battery
has a life of approxi-
mately ten years.
When the battery
expires, Pout and
Run are affected
(see Chapters 4 & 5).
Return the unit to
the factory for a
replacement.
Figure 2 -
How to Open the
Series 942.
WARNING:
The front panel
screw turns 90
°
only. Do not apply
excessive force or
turn the screw more
than 90
°
.
!