Soft Starters - Danfoss MCO 101 Manual

Extended and Advanced Cascade Controller
Option
27-72 RELAY 10 → [74] Pump 3 to Line Voltage
27-73 RELAY 11 → [75] Pump 4 to Line Voltage
27-74 RELAY 12 → [76] Pump 5 to Line Voltage

3.1.8 Soft Starters

Soft starters can be used in place of contactors for any configuration using fixed speed pumps. If soft starters are selected, they must be used for ALL
fixed speed pumps. Mixing soft starters and contactors will result in an inability to control the output pressure during staging and de-staging transitions.
When using soft starters, a delay will be added from when the staging signal occurs until staging takes place. The delay is necessary due to the ramp
time of the fixed speed pump because of the soft starter.
®
MI.38.C2.22 - VLT is a registered Danfoss trademark
3 Supported Configuration
3
3-9