Accessibility; Drives; Electric Motor; Speed Control - Danfoss iSave 21 User Manual

User manual iSave 21

6.8 Accessibility

With respect to the service and replacement of the complete iSave unit, it is recommended
to maintain sufficient space around the unit.
The space must be sufficient enough to allow for safe lifting of the equipment, with no risk
for personal injury and/or damage to the iSave.

6.9 Drives

6.9.1 Electric motor

The iSave must only be driven by an electric motor.
Using anything other than an electric motor can lead to an irreparable fracture of the
iSave's internal parts.

6.9.2 Speed control

The rotation speed on the electric motor can be controlled by a VFD.
The direction of rotation can be seen on the identification label.
Checking the direction of rotation can be made by:
1. Looking at the fan in the end of the electric motor.
2. Removing the plug in the bell housing and watch the rotation of coupling.
3. Before assembly the iSave on the electrical motor, check the rotation of the shaft on the
electrical motor.
Special attention has to be on NON PROTECTED – FREE ROTATING shaft on the electrical
motor. Ignorance will or could result in personal injury.
• Running the iSave in the wrong direction for more than a few minutes can cause un-
intended wear on the iSave.
• If the electric motor is running at a lower speed, extra care must be taken to ensure that
the electric motor is NOT overheated. External cooling may be necessary.

6.9.3 Starting torque on the iSave/ramping the electric motor.

Because of the inertia of the iSave internal parts and the fact that the iSave includes a posi-
tive displacement pump, the torque will exceed the maximum allowable torque for the
iSave when the speed is not ramped up from zero to maximum.
It is required to use a VFD or a soft starter.
A minimum of 10 seconds is required when ramping up the speed from zero to maximum.
Otherwise, the torque on the iSave will exceed the maximum limit and may lead to an
irreparable fracture of the iSave's internal parts.

6.9.4 Torque overloads protection on the iSave.

The electric motor and iSave must always be protected against overload.
Both at start-up and at continues operation the maximum torque on the iSave must be
monitored.
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