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speed, for example, may satisfy system requirements,
while running four pumps at a lower speed meets
requirements and achieves higher efficiency.
Danfoss has available the Multiple Unit Staging
Efficiency Calculator (MUSEC), a free software
program available on the Danfoss website. By
entering pump and system data, MUSEC provides
the programmer with on and off staging frequencies
for each pump at optimal efficiency. Enter the data for
each pump in Extended Menu parameters 739 and
740. For a free download, go to www.danfoss.com
and enter MUSEC in the search box.
Quick Menu 033 Par. 739 Master/Slave
staging on frequencies
(M/S STAGE FREQ)
Value:
Min. freq - Max. freq
(Par. 201 - 202)
Function:
Best efficiency staging on frequency can be calculated
for the cascade controller based on pump and system
curves to meet feedback requirements. Use the
MUSEC software program to determine the most
efficient staging on frequency for each pump.
Description of choice:
Enter the staging on frequency for each pump.
After pressing the CHANGE DATA key in
parameter 739, use the (+) and (-) keys to scroll
through all four slave settings.
If the pump or system data is unknown, refer
to the section Alternative Programming at
the end of this chapter.
Quick Menu 034 Par. 740 Master/Slave
staging off frequencies
(M/S DESTAGE FREQ)
Value:
Min. freq - Max. freq
(Par. 201 - 202)
Function:
Best efficiency staging off frequency can be calculated
for the cascade controller based on pump and system
curves to meet feedback requirements. Use the
MUSEC software program to determine the most
efficient staging off frequency for each pump.
MG.60.I3.02 - VLT is a registered Danfoss trademark
Cascade Controller Option
Description of choice:
Enter the staging off frequency for each pump.
After pressing the CHANGE DATA key in
parameter 740, use the (+) and (-) keys to scroll
through all four slave settings.
If the pump or system data is unknown, refer
to the section Alternative Programming at
the end of this chapter.
Step 2: Slave drive programming
The slave drives run in open loop mode and recieve
stop/start and speed reference commands from the
Master drive. Each slave drive must be programmed
with the nameplate data from the motor it controls.
All other applicable parameter settings must match
the settings in the Master drive.
All parameter settings can be transferred from one
VLT drive to another by using the removeable keypad.
Min.
freq.
Parameter 004, LCP Copy, allows this function. First,
upload all parameter values to the Local Control Panel
(LCP) keypad. The keypad can then be removed and
plugged into another VLT drive where all parameter
values can be downloaded. If motor or drive sizes
differ, Download Power-independent Parameters can
be selected in parameter 004 to omit downloading
motor and current dependent data.
Manual programming of slave drives is also possible
following the procedure described for Master drive
programming. To copy required Master drive
parameter settings manually into each slave drive,
enter Master drive settings for Quick Menu items
7-13 and 18-19 into each slave drive.
Commisioning slave drives is done in the
following sequence of events:
Enter Motor Nameplate Data
Enter the nameplate data from each motor into
its associated drive in accordance with Quick
Menu items 001 - 006 in Chapter 6, VLT Drive
and Cascade Control Card Setup.
Download master drive programming data
Min.
freq.
Use the Master LCP to download parameter settings
into the slave drives in accordance with procedures
in Extended Menu parameter 004, LCP Copy.
The Extended Menu is accessed by pressing the
[EXTEND. MENU] key on the LCP keypad.
49
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