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•
RELAY 1 (R1) and RELAY 2 (R2) are the built-in
relays in the Adjustable frequency drive.
•
When all relays are de-energized, the first built-in
relay to be energized will cut in the contactor
corresponding to the pump controlled by the
relay. For example, RELAY 1 cuts in contactor K1,
which becomes the lead pump.
•
K1 blocks for K2 via the mechanical interlock
preventing line power from being connected to
the output of the Adjustable frequency drive (via
K1).
•
Auxiliary break contact on K1 prevents K3 from
cutting in.
•
RELAY 2 controls contactor K4 for on/off control
of the fixed speed pump.
•
At alternation, both relays de-energize, and
RELAY 2 will be energized as the first relay.
Application Examples
VLT
®
HVAC Drive Design Guide
MG11BB22 - VLT
®
is a registered Danfoss trademark
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Содержание VLT HVAC Drive FC 100 Series
Страница 10: ...How to Read this Design Gui VLT HVAC Drive Design Guide 1 6 MG11BB22 VLT is a registered Danfoss trademark 1 1...
Страница 56: ...Introduction to VLT HVAC D VLT HVAC Drive Design Guide 2 46 MG11BB22 VLT is a registered Danfoss trademark 2 2...
Страница 126: ...How to Install VLT HVAC Drive Design Guide 5 38 MG11BB22 VLT is a registered Danfoss trademark 5 5...
Страница 136: ...Application Examples VLT HVAC Drive Design Guide 6 10 MG11BB22 VLT is a registered Danfoss trademark 6 6...
Страница 160: ...RS 485 Installation and Set VLT HVAC Drive Design Guide 7 24 MG11BB22 VLT is a registered Danfoss trademark 7 7...