43
117
Motor Thermal Protection
(MOT. THERM PROTEC)
Value:
No protection (NO PROTECTION)
[0]
Thermistor warning (THERMISTOR WARNING)
[1]
Thermistor trip (THERMISTOR FAULT)
[2]
ETR Warning 1 (ETR WARNING 1)
[3]
✭
ETR Trip 1 (ETR TRIP 1)
[4]
ETR Warning 2 (ETR WARNING 2)
[5]
ETR Trip 2 (ETR TRIP 2)
[6]
ETR Warning 3 (ETR WARNING 3)
[7]
ETR Trip 3 (ETR TRIP 3)
[8]
ETR Warning 4 (ETR WARNING 4)
[9]
ETR Trip 4 (ETR TRIP 4)
[10]
Function:
The drive is able to monitor the motor temperature in two different
ways:
By a thermistor installed in the motor. The thermistor is connected
to one of the analog input terminals (53 or 54).
Calculation of the thermal load by the Electronic Thermal Relay
(ETR) is based on current, frequency and time. This is compared
with the rated motor current and the rated motor frequency. The
calculations take into account the reduced cooling of the motor at
low speeds.
ETR Tip 1 through 4 and ETR Warning 1 through 4 correspond to the
four drive setups. This enables the use of the ETR function to protect
up to four different motors if a different setup is used for each different
motor.
NOTE
If multiple setups are used, be sure to program
complete motor data (parameters 102 through
106) and parameter 117 in each setup.
Description of choice:
Select
No protection
if no warning or trip is desired when the motor is
overheated.
Select
Thermistor warning
if a warning is desired when the motor
thermistor reaches its trip point.
Select
Thermistor trip
if a fault is desired when the motor thermistor
reaches its trip point.
Select
ETR Warning 1 through 4
, if a warning is desired when the
motor is overheated according to the ETR calculations.
The drive can also be programmed to give off a warning signal through
one of the digital outputs.
Select
ETR Trip 1 through 4
if a fault is desired when the motor is
overheated according to the ETR calculations.
Motor Thermal Protection
The motor temperature is calculated on the basis of motor current,
output frequency and time. The graph shows the amount of time that the
drive can provide a current level to the motor at the rated motor
frequency, 20% of rated motor frequency and 200% of rated motor
frequency.
118
Motor Power Factor (Cos
Æ
)
(MOTOR PWR FACT)
Value:
0.50 - 0.99
✭
0.75
Function:
Automatic Energy Optimization (AEO) (see parameter 101,
Torque
Characteristics
) can be calibrated to work with motors with greater than
4 poles. Motors with 6, 8, and 12 poles have a lower power factor
which restricts the energy saving capability of AEO. Calibrating AEO
can optimize this function. The full load power factor will either be on the
motor nameplate or available from the motor manufacturer.
Description of choice:
Enter the full load power factor value.
✭
I
ndicates factory default setting. Numbers in brackets [ ] represent selection as displayed on the serial bus.
