Danfoss VLT, Instruction Manual

Page: 64 / 179

NOTE!
This parameter cannot be changed while the motor is running.
1-28 Motor Rotation Check
Option: Function:
Following installation and connection of the motor, this function allows the correct motor rotation
direction to be verified. Enabling this function overrides any bus commands or digital inputs, except
External Interlock and Safe Stop (if included).
[0] * OFF Motor Rotation Check is not active.
[1] Enabled Motor Rotation Check is enabled. Once enabled, display shows:
"Please Note! Motor may run in wrong direction".
Pressing [OK], [Back] or [Cancel] will dismiss the message and display a new message: “Press [Hand on] to start the motor. Press [Cancel] to abort”.
Pressing [Hand on] starts the motor at 5 Hz in forward direction and the display shows: “Motor is running. Check if motor rotation direction is correct.
Press [Off] to stop the motor”. Pressing [Off] stops the motor and resets par.1-28
Motor Rotation Check
. If motor rotation direction is incorrect, two
motor phase cables should be interchanged. IMPORTANT:
Line power must be removed before disconnecting motor phase cables.
3-41 Ramp 1 Ramp-up Time
Range: Function:
10.00 s* [1.00 - 3600.00 s] Enter the ramp-up time, i.e., the acceleration time from 0 RPM to par.1-25
Motor Nominal Speed
.
Choose a ramp-up time such that the output current does not exceed the current limit in
par. 4-18
Current Limit
during ramping. See ramp-down time in par.3-42
Ramp 1 Ramp-down
Time
.
par
.3 − 41 =
tacc
×
nnorm par
.1 − 25
ref rpm
s
3-42 Ramp 1 Ramp-down Time
Range: Function:
20.00 s* [1.00 - 3600.00 s] Enter the ramp-down time, i.e., the deceleration time from par.1-25 Motor Nominal Speed to 0 RPM.
Choose a ramp-down time such that no overvoltage arises in the inverter due to regenerative op-
eration of the motor, and such that the generated current does not exceed the current limit set in
par. 4-18
Current Limit . See ramp-up time in par.3-41 Ramp 1 Ramp-up Time .
par .3 − 42 =
tdec
×
nnorm
par
.1 − 25
ref rpm
s
4-11 Motor Speed Low Limit [RPM]
Range: Function:
0 RPM* [0 - par. 4-13 RPM] Enter the minimum limit for motor speed. The Motor Speed Low Limit can be set to correspond to
the manufacturer’s recommended minimum motor speed. The Motor Speed Low Limit must not
exceed the setting in par.4-13
Motor Speed High Limit [RPM] .
6 How to program the adjustable frequency
drive VLT ® HVAC Drive Instruction Manual
6-6
MG.11.A9.22 - VLT ® is a registered Danfoss trademark
6