Thermal Motor Protection; Thermal Inverter Protection - KEB COMBIVERT F4-F Applications Manual

Keep on Running Functions
6.6 Keep on Running
Functions
6.6.1 Thermal Motor
Protection
E.dOH Switch-off Delay (Pn.16)
Reaction to E.dOH (Pn.25)
6.6.2 Thermal Inverter
Protection
Reaction to E.OH during
prewarning time (Pn.26)
© KEB Antriebstechnik, 1999
All Rights reserved
The protective functions protect the inverter against switch off through overcurrent,
overvoltage as well as thermal overloading. Furthermore, you can restart the drive
automatically after a fault (Keep-on-Running).
Attention! the protective functions refer exclusively to software functions, which
possibly may not respond in case of a defective unit.
The KEB COMBIVERT allows the thermal monitoring of the motor. For that the ther-
mal contact or temperature sensor is connected to the terminals OH/OH of the power
stage.
If the thermal contact breaks contact or if the temperature sensor rises above the
response resistor, then the switching condition 7 (PTC-warning) is set. Now a digital
output can be set with do.1...do.8 (see Chapter 6.3).
After expiration of an adjusted time (Pn.16) in the range of 0...120s the inverter switches
to E.dOH. The behaviour in this time is defined with Pn.25.
OH
OH
OH
OH
Bridge, if no Thermo contact
external evaluation (break contact)
takes place
Pn.25 Display Reaction
0 E.dOH Immediate disabling of modulation
1 A.dOH Quick stopping / disabling of modulation
after reaching speed 0
2 A.dOH Quick stopping / holding toruqe at speed 0
3 A.dOH Immediate disabling of modulation
4 A.dOH Quick stopping / disabling of modulation
after reaching speed 0
5 A.dOH Quick stopping / holding torque at speed 0
6 none No effect on the drive:
!Fault is being ignored!
To protect the inverter against thermal overloading, e.g. in case of insufficient cooling,
the heat sink is monitored by means of a temperature sensor. If the heat sink
temperature rises above 70...90°C, depending on the power stage, then the switching
condition 26 (overtemperature warning) is set internally. Now a digital output can be
set with do.1...do.8 (see Chapter 6.3). As long as the temperature does not drop
below the tripping level, the inverter switches after 10s to one of the following fault
routines, which are defined with Pn.26:
Pn.26 Display Reaction
0 E. OH Immediate disabling of modulation
1 A. OH Quick stopping / disabling of modulation
after reaching speed 0.
2 A. OH Quick stopping / Holding torque at speed 0
3 A. OH Immediate disabling of modulation
4 A. OH Quick stopping / disabling of modulation
after reaching speed 0
5 A. OH Quick stopping / holding torque at speed 0
6 none No effect on the drive
!Fault is being ignored!
Name: Basis
KEB COMBIVERT F4-F
Functional Description
OH
OH
Temperature sensor (PTC)
1650Ω...4kΩ tripping resistance
750Ω...1650Ω reset resistance
(according to DIN VDE 0660 Part
Date
08.03.99
ANTRIEBSTECHNIK
302)
Restart
Remove fault;
Actuate reset
Automatic reset, if
the fault is no longer
present
- inapplicable-
Restart
Remove fault;
Actuate reset
Automatic reset, if
the fault is no longer
present
- inapplicable-
Chapter Section Page
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