Instruction manual

Cascade Controller Option

■ Optional Hand/Off/Auto Switch

ptional Hand/Off/Auto Switch

In standard cascade control mode, an optional

Hand/Off/Auto switch on the constant speed motor

starter is common. During normal operation, the switch

is set to AUTO and the drive will signal automatic

start and stop commands to the motor. The HAND

position allows manual operation of the motor. The

motor can be disabled by setting the switch to OFF.

For a motor in the OFF position, the

cascade controller will try to start it by triggering

its relay. Since no contribution will occur, the next

pump will be switched on. The relay timer will,

however, assume operation for a disabled motor.

See Chapter 12, Service Parameters.

The diagram below provides wiring instructions

for an optional Hand/Off/Auto switch.

MG.60.I5.22 - VLT is a registered Danfoss trademark