Lenze DSD - Manual (Page 468)

18 Drive dimensioning messages
18.8 Inverters
468
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
18.8.10 Control mode VFCplus without feedback is not permissible
18.8.11 The SLVC control mode is not permissible for inverters >55 kW
18.8.12 Too low braking torques at low speed
18.8.13 Motor limit rating is exceeded
Warning!
For the hoist drive, the Servo Drive 9400 combination greater than 55 kW is not permissible with the VFC-
PLUS control type without feedback.
Cause Effects Possible remedies
The control mode is not suitable for
hoist drives.
The drive must not be operated in
this control mode.
Select a control mode with feedback.
Warning!
The SLVC control mode is not permissible for inverters with a rating of more than 55 kW.
Cause Effects Possible remedies
The SLVC control mode must not be
used for inverters in this power
range.
The drive must not be operated in
this control mode. The control is not
stable!
Select a control mode with feedback.
Note!
The drive system only develops small amounts of braking torque at low speeds in SLVC operating mode.
Use alternative braking methods such as DC-injection braking or mechanical brakes.
Cause Effects Possible remedies
The drive system only develops small
amounts of braking torque at low
speeds in the SLVC control mode.
At low speeds with operation in gen-
erator mode, the motor cannot be
controlled.
• Select a control mode with feed-
back.
• In this control mode, do not oper-
ate the drive permanently at low
speeds .
• Do not use the control mode with
hoist drives.
Warning!
The rated motor power is xxx kW. In the "V/f control" mode, the max. motor limit rating of yyy kW is ex-
ceeded. The selected drive system cannot ensure a safe hoist operation.
Cause Effects Possible remedies
The rated motor power is too high for
a hoist drive with V/f characteristic
control.
At low speeds, the motor is magnet-
ised as required. Overheating and
torque losses are the result. In this
control mode, a safe operation is not
possible.
Select a control mode with feedback.