Operating Instructions

SED2 VFD Operation & Maintenance Manual
94 Siemens Building Technologies, Inc.
Digital Inputs – Use DIGITAL IN 1 through DIGITAL IN 6 (Points 71 through 76) to monitor
the status of the SED2 digital inputs from the field panel. This is useful when the SED2 is
programmed for control of drive functions (start/stop, fault reset, off, etc.) via the SED2
control terminal strip. Over the P1 serial link, you can monitor a control sequence that
requires receipt of a contact closure on the SED2 terminal strip.
Digital Outputs – RELAY OUT 1 (Point 40) and RELAY OUT 2 (Point 41) are physical DOs
on the SED2 and can be monitored to confirm drive status. Their purpose depends on how
the drive has been set up. The drive can be programmed so that these points can display
various limits, warnings, and status conditions. Some examples include frequency limit, over
current, and motor over temperature fault.
Analog Inputs – Use ANALOG IN 1 (Point 45) and Analog IN 2 (Point 46) to monitor the
status of the drives analog inputs (4 to 20 mA) from the field panel. For example, the chilled
water feedback could be sent to the field panel, calculations performed, and the chilled water
valve control command could be sent from the field panel through the drive and control the
drive analog output over ANALOG OUT 1 (Point 47).
Analog Outputs – Use ANALOG OUT 1 (Point 47) and ANALOG OUT 2 (Point 48) to control
an output (4 to 20 mA) from the field panel.
Loop gains – P GAIN (Point 61), I GAIN (Point 62), and D GAIN (Point 63) are gain
parameters similar to the P and I gains in the APOGEE TECs. The Siemens Building
Technologies representative must program the actual P and I gain constants through the
SED2 drive.
Address limitations – Set CRLR ADDRESS (Point 1) to any value from 0 through 99. The
default value for this point is 99.
Table 8. Point Database for Application 2722.
Point
Number
Point
Type
Descriptor
Factory
Default
(SI Units)
Engr.
Units (SI
Units)
Slope
(SI
Units)
Intercept
(SI Units)
On Text
Off
Text
01 LAO CTLR
ADDRESS
99 - 1 0 - -
02 LAO APPLICATION 2722 - 1 0 - -
{03} LAI FREQ
OUTPUT
0 HZ .04 -650 - -
{05} LAI SPEED 0 RPM 1 -16250 - -
{06} LAI CURRENT 0 A 0.5 0 - -
{07} LAI TORQUE 0 NM .02 -3250 - -
{08} LAI ACTUAL
POWER
0 HP/KW .01 0 - -
{09} LAI TOTAL KWH 0 KWH 1 0 - -
{13} LAI DC BUS VOLT 0 V 1 0 - -
{14} LAI REFERENCE 0 HZ .04 -650 - -