Operating Instructions

Chapter 4 - Parameters and Menu Structure
Parameters (M3)
112 | 187
Siemens Industry, Inc.
Siemens BT300 HVAC Drive
DPD01809
Smart Infrastructure
2019-05-29
Auto-change (P3.14.4)
Table 70: Auto-Change Selections.
Selection
Selection Name
Description
0
Disabled
The priority/starting order of the motors is always 1-2-3-4-5 in normal
operation. It may have changed during its run if interlocks have been
removed and added again, but the priority/order is always restored after a
stop.
1
Enabled
The priority is changed at certain intervals to get an equal wear on all
motors. The intervals of the auto-change can be changedAutochInterval
(P3.14.5). You can also set a limit for how many motors are allowed to run
AutochMotorLimit (P3.14.7) as well as for the maximum frequency of the
regulating drive when the auto-change is done Autoch:FreqLim (P3.14.6).
If the auto-change interval Autoch Interval (P3.14.5) has expired, but the
frequency and motor limits are not fulfilled, the auto-change will be
postponed until all conditions are met (this is to avoid for example sudden
pressure drops while the system is performing an auto-change when there
is a high capacity demand at a pump station.
Example:
In the auto-change sequence after the auto-change has taken place, the motor with the highest priority is
placed last and the others are moved up by one place:
Starting order/priority of motors: 1 → 2 → 3 → 4 → 5
→ Autochange →
Starting order/priority of motors: 2 → 3 → 4 → 5 → 1
→ Autochange →
Starting order/priority of motors: 3 → 4 → 5 -→ 1 → 2
Fire Mode (M3.16)
The drive ignores all commands from the keypad, fieldbuses, and the PC tool and runs at the speed defined in
Fire Mode Frequency Source (P3.16.5) when the mode is activated. If activated, the alarm sign displays on
the keypad and the warranty is void. To enable the function, a password must be set in Fire Mode Password
(P3.16.1).
NOTE:
The warranty is void if the Fire Mode function is activated. Test Mode can be used
to test the Fire Mode function without voiding the warranty.
There is a different password for test mode, to be used for testing the Fire Mode without the warranty
becoming void.
The Fire Mode settings are presented in the following table: