Basic Documentation

Siemens Building Technologies, Inc. Page 3 of 9
Document No. A6V10431169
All VFDs shall have the following standard features:
1. All VFDs shall have the same customer interface, including digital display and keypad, regardless of horsepower
rating. The keypad is to be used for local control, for setting all parameters and for stepping through the displays
and menus. The keypad shall be removable, capable of remote mounting and have its own non-volatile memory.
The keypad shall be capable of uploading and downloading of parameter settings as an aid for start-up of multiple
VFDs.
2. The keypad shall include Hand, Auto, and Stop selections. When in “Hand”, the VFD will be started and the speed
will be controlled from the up/down arrows. When in “Off”, the VFD will be stopped. When in “Auto”, the VFD will
start via an external contact closure and the VFD speed will be controlled via an external speed reference. The
drive shall incorporate “bumpless transfer” of speed reference when switching between “Auto” and “Hand”
modes.
3. All circuit boards shall be varnished to meet IEC 60068-2-60 Method 1 and be able to withstand hydrogen sulfide
(H2S) and sulfur dioxide (SO2)
4. A built-in time clock shall be housed in the keypad. The clock shall have a battery backup with 10 years minimum
life span, The clock shall be used to date and time stamp faults and record operating parameters at the time of
fault.
5. The VFD shall have start-up wizards visible on the keypad for quick access to application macros specifically
designed to facilitate start-up.
6. The user shall be able to define any parameter as a favorite using the keypad.
7. The VFD shall have cooling fans designed to be replaced without removing the VFD from the wall or removing the
VFD enclosure. The cooling fan shall operate for a period of 10 years before it is replaced.
8. The VFD shall include capacitors which do not require conditioning prior to installation. The VFD shall have an
infinite shelf life.
9. The VFD fans shall operate only when require. The user shall have the ability to choose additional cooling fan
control.
10. The VFD shall monitor and display using the keypad nine (9) parameters at one time without the need to scroll
through multiple screens. Each parameter shall be user defined. The following is a sample of the parameters which
can be monitored and view using the keypad. All parameters viewed from the list below shall be capable of being
displayed at all times. The display shall be in complete English words (alpha-numeric codes are not acceptable).
Output Frequency
Motor Speed (RPM, %, or Engineering units) Motor Current
Calculated Motor Torque Calculated Motor Power (kW)
DC Bus Voltage Heatsink Temperature (deg F)
Output Voltage Analog Input Values
Analog Output Value Keypad Reference Values
Elapsed Time Meter (resettable) KWh meter (resettable)