Emerson EV2000 Series User Manual page 83

1:Common mode (with low speed compensation)
Since the cooling effects of common motor deteriorates
at low speed (below 30Hz), the motor's overheat
protecting threshold should be lowered, which is called
low speed compensation.
2: Variable frequency motor (without low speed
compensation)
The cooling effects of variable frequency motor is not
affected by the motor's speed, so low speed
compensation is not necessary.
FL.01 Motor's overload
protection coefficient
In order to apply effective overload protection to different
kinds of motors, the Max output current of the drive
should be adjusted as shown in Fig. 5-71.
Time
80%
1min
160%
Fig. 5-71 Motor's overload protection coefficient
Use the following coefficient to calculate the coefficient:
motor rated current
Motor overload
=
protection coefficient
inverter's rated output current
Generally, the Max load current is the motor's rated
current.
Note:
If the motor's rated current does not match that of the drive,
motor's overload protection can be realized by setting
FL.00~FL.01.
FL.02 Protection of
Over-voltage at stall
FL.03 Over-voltage point at
stall
0: Disabled
1: Enabled
During deceleration, the motor's decelerate rate may be
lower than that of drive's output frequency due to the
load inertia. At this time, the motor will feed the energy
back to the drive, resulting in the voltage rise on the
Range:20.0~110.0%
【 100.0% 】
100%
Motor overload
protective
coefficient
200%
Current
× %
100
Range:0. 1 【 1 】
Range:120~150%
【 140.0% 】
EV2000 Series Universal Variable Speed Drive User Manual
Chapter 5 Parameter Introductions
drive's DC bus. If no measures taken, the drive will trip
due to over voltage.
During the deceleration, the drive detects the bus
voltage and compares it with the over voltage point at
stall defined by FL.03. If the bus voltage exceeds the
stall overvoltage point, the drive will stop reducing its
output frequency. When the bus voltage become lower
than the point, the deceleration continues, as shown in
Fig. 5-72.
Overvolt
point at
stall
Output
freq.
Fig. 5-72 Over-voltage at stall
Note:
The drive will alarm and display E015 when it is in the
status of over-voltage at stall for more than 1 minute.
If the stall point is set too low, you can prolong the Acc and
Dec time properly.
FL.04 Overload detection
FL.05 Overload pre-alarm
detection threshold
FL.06 Overload detection time Range:0.0~60.0s 【 5.0s 】
EV2000 has protection over drive and motor overload.
See Table 2-1 for drive overload protection, and FL.00
and FL.01 for motor overload protection. FL.04~FL.06
can monitor the overload condition before overload
protection happens.
A B C D
Overload alarm detection
0: Detect all the time
1: Detect in constant speed status
Overload protection
0: No alarm and continue operation
1: Alarm and stop operation
Overload detection threshold
0: % of motor's rated current
1: % of drive's rated current
Reserved
Fig. 5-73 Settings of FL.04
79
Time
Time
Range:000~111 【 000 】
Range:20~150%
【 130.0% 】