T and Al). See the T7660 Space
Temperature
Sensor
specification
sheet, Form 63-4219,
for
the
correct temperature to
measure
resistance
value
cross-reference.
4.
If
long sensor
wiring
is used,
m-
resistance
supplied to the W7620 by both
the
temperature
sensor and the leadwire for greater accuracy.
Output Point Test Procedures
Testing outputs consists of observing the analog or digital
output states of physical points to see that the value
or
state is comparable to the point value as displayed on
the S7610
POT
or ZM760l/ZM7603 software. These
devices can be used to
override
the output point to a
known state to facilitate checkout.
Use
the following
procedures:
1.
Set the
override
on an output point to a desired
value with the S7610 POT or ZM7601/ZM7603
software.
2. Measure or observe the output
condition
(e.g., fan
turns
on).
3.
If
the output does not follow the command
override condition, isolate
the
problem by
checking connections and measurements at
the
output destination as
well
as
at the W7620.
4. Clear the override condition.
Example:
The
following
procedure is for Fan (can be
any
one of the outputs, 1-7, depending on
output options
selected,
see W7620 Single
Zone/WSHP
Application
Guide, Form
63-4220.
1.
Display Fan (OUT.) on the S7610 POT or
ZM7601/03 software.
2. Set into override the point to the desired state, ON
or OFF.
3.
Observe the fan or measure
the
output. If the
expected result
is
not achieved, measure the
resistance across the correct
terminals
(e.g.,
OUT1 A and C). The resistance should hold at
approximately
1.0 when the output is ON.