CEMP-E
TI 810-11
30 November 1998
c. Figure 5-7b shows the ladder diagram variations for variable speed drives. It shows connections
to the variable speed drive control circuits in lines 100 and up and in lines 200 and up. There is no
magnetic starter in this case, because all starter functions are provided by the variable speed drive
controller.
Figure 5-7b. Ladder diagram variations for variable speed drives.
d. Figure 5-7c shows variable speed drives in lieu of actuators for the inlet vanes.
Figure 5-7c. Equipment variations for variable speed drives.
e. Figure 5-7d shows the variations in the control panel interior door layout for variable speed drives.
There are no receiver gauges in the interior door, because IPs for the inlet vanes are not required.
Figure 5-7d. Control panel interior door layout variations for variable speed drives.
f. Figure 5-7e shows the variations in the back panel arrangements for variable speed drives, with
the bulkhead fittings for control of the dampers and the cooling coil valve. There is no need for bulkhead
fittings for control of inlet vanes.
Figure 5-7e. Control panel back panel layout variations for variable speed drives.
g. The terminal block layout will show terminals assigned to the variable speed drive units rather
than for the magnetic starter circuits for fans.
Figure 5-7f. Control panel terminal block layout variations for variable speed drives.
h. Figures 5-7g through 5-7j depict the use of variable speed drives in lieu of inlet guide vanes for a
DDC system.
Figure 5-7g. DDC schematic variations for variable speed drives.
Figure 5-7h. DDC ladder diagram variations for variable speed drives.
Figure 5-7i. DDC schedule variations for variable speed drives.
Figure 5-7j. DDC I/O table and data terminal strip layout variations for variable speed drives.
6. CONTROL SYSTEM VARIATIONS FOR STEAM PREHEAT COIL WITH FACE AND BYPASS
DAMPER.
5-4
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