6.1.11. Fixed Variable Speed Pump Wiring Diagram
6.1.12. Lead Pump Alternation Wiring Diagram
Every pump must be connected to two con-
tactors (K1/K2 and K3/K4) with a mechanical
interlock. Thermal relays or other motor pro-
tection devices must be applied according to
local regulation and/or individual demands.
•
RELAY 1 and RELAY 2 are the built in
relays in the frequency converter.
•
When all relays are de-energized,
the first built in relay to be energized
will cut in the contactor correspond-
ing to the pump controlled by the
relay. E.g. RELAY 1 cuts in contactor
K1, which becomes the lead pump.
•
K1 blocks for K2 via the mechanical
interlock preventing mains to be con-
nected to the output of the frequen-
cy converter (via K1).
•
Auxiliary break contact on K1 pre-
vents K3 to cut in.
•
RELAY 2 controls contactor K4 for
on/off control of the fixed speed
pump.
•
At alternation both relays de-energi-
zes and now RELAY 2 will be ener-
gized as the first relay.
6.1.13. Cascade Controller Wiring Diagram
The wiring diagram shows an example with
the built in BASIC cascade controller with one
variable speed pump (lead) and two fixed
speed pumps, a 4-20 mA transmitter and Sys-
tem Safety Interlock.
6. Application Examples
VLT
®
HVAC Drive Design Guide
118
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
6
Содержание VLT series
Страница 78: ...4 How to Order VLT HVAC Drive Design Guide 78 MG 11 B2 02 VLT is a registered Danfoss trademark 4...
Страница 120: ...7 RS 485 Installation and Set up VLT HVAC Drive Design Guide 120 MG 11 B2 02 VLT is a registered Danfoss trademark 7...
Страница 152: ...8 Troubleshooting VLT HVAC Drive Design Guide 152 MG 11 B2 02 VLT is a registered Danfoss trademark 8...