Application 2 - Cooling Tower De-Icing Mode - Siemens BT300 Application Manual

Application 2 - Cooling Tower De-Icing Mode

Sequence of Operation
1. Fan Application.
2. The De-Icing mode application requires a standard Run/Stop and speed reference
using the terminal input or field bus when De-Icing mode is disabled (not discussed
here). De-Icing mode activation causes the following changes to the drive's
operation:
a. The De-Icing mode is activated at any time using Digital Input 2 closure.
b. Upon activation, a reverse command is issued to spin the motor backwards.
c. A Run command is issued to start the motor. This overrides the standard
d. The motor runs at a pre-defined speed.
e. The De-Icing mode is de-activated at any time using Digital Input 2 opening.
Parameter Changes (assuming Application 1 is already applied)
Part. No. Value
P3.5.1.2 DigIn Slot0.1
P3.5.1.4 DigIn SlotA.2
P3.5.1.5 DigIn SlotA.2
P3.3.4 PresetFreq0
P3.3.11 30 (or desired) Preset Freq 0
Siemens Industry, Inc.
Run/Stop command being supplied by any other digital input or field bus.
Parameter Function
Ctrl Signal 2 A
Ctrl Signal 2 B
I/O Ctrl Force
I/O B Ctrl Ref B
Function Selection
Remove DIN2 default
DIN2 Run Rev. Ctrl B
DIN2 force Ctrl B
PresetFreq0 is speed ref B
Fixed speed as desired
Document Reference
(DPD01149)
Sect. 3.5.1.2 and 3.5.7.1
Sect. 3.5.1.2 and 3.5.7.1
Sect. 3.5.1.2 and 3.5.7.1
Sect. 3.5.5
Sect. 3.5.5
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