Danfoss vlt aqua Design Guide

6.1.13 Start/Stop Conditions
Commands assigned to digital inputs. See Digital Inputs , par.5-1*.
Variable speed pump (lead) Fixed speed pumps
Start (SYSTEM START /STOP) Ramps up (if stopped and there is a demand) Staging (if stopped and there is a demand)
Lead Pump Start Ramps up if SYSTEM START is active Not affected
Coast (EMERGENCY STOP) Coast to stop Cut out (built-in relays are de-energized)
Safety Interlock Coast to stop Cut out (built-in relays are de-energized)
Function of buttons on the Local Control Panel
Variable speed pump (lead) Fixed speed pumps
Hand On Ramps up (if stopped by a normal stop com-
mand) or stays in operation if already running.
De-staging (if running)
Off Ramps down Cut out
Auto On Starts and stops according to commands sent via
terminals or serial bus.
Staging/De-staging
VLT
®
AQUA Drive Design Guide 6 Application Examples
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark 6-9
6

Danfoss vlt aqua Specifications

General

Supply Voltage	200-240V, 380-500V, 525-600V
Enclosure	IP20
Features	Energy optimization
Approvals	CE, UL, cUL
Input Voltage Range	200-240V, 380-500V, 525-600V
Output Voltage Range	0 to supply voltage
Protection Features	Overvoltage, Undervoltage, Overcurrent, Short circuit, Ground fault
Communication Interfaces	PROFIBUS
Cooling Method	Air-cooled