Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 155)

Function library
Thermal motor monitoring, error detection
7−84
L
EDB82MV752 EN 5.2
7.12.2 Temperature monitoring of the motor with PTC and earth−fault detection
Description
You can connect PTC resistors via the inputs X2/T1 and X2/T2 according to DIN 44081 and DIN
44082. The motor temperature is detected and integrated into the drive monitoring.
It is also possible to connect a thermostat (NC contact) to X2/T1 and X2/T2. Lenze AC three−phase
motors are equipped with these components as standard.
We recommend to always activate the PTC input for operation with motors equipped with PTC
resistors or thermostats. By this you prevent the motor from overheating.
(
Stop!
l The controller can only detect one PTC resistor! Do not connect several PTC
resistors in series or in parallel:
– The motor temperature would be measured incorrectly.
– The motors could be destroyed by overheating.
l If you connect several motors to one controller, use thermostats (NC contacts)
connected in parallel to monitor the motor temperature.
l To achieve a total motor protection you must install an additional temperature
monitoring with a separate evaluation.
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0119
v
−18−
Configuration of
motor temperature
monitoring (PTC
input) / earth fault
detection 0 0 PTC input not active Earth fault detection
active
·
Signal output configuration under C0415
·
If several parameter sets are used, the
monitoring must be separately adjusted
for each parameter set.
·
Deactivate the earth fault detection, if it
has been activated unintentionally.
·
If the earth fault detection is active, the
motor starts after controller enable with
a delay of approx.40 ms.
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1 PTC input active,
TRIP set
2 PTC input active,
Warning set
3 PTC input not active Earth fault detection
inactive
4 PTC input active,
TRIP set
5 PTC input active,
Warning set
Activation
)
Note!
l In the Lenze setting, the temperature monitoring of the motor is switched off!
l If you are dealing with several parameter sets, you must activate the monitoring in
each parameter set!
1. Connect the monitoring circuit of the motor to X2/T1 and X2/T2.
– If 1.6 k
W < R < 4 kW the monitoring is activated.
2. Set the reaction of the controller:
– C0119 = 0 or 3: Temperature monitoring of the motor is switched off
– C0119 = 1 or 4: TRIP fault message (keypad display: OH3
a)
– C0119 = 2 or 5: Warning signal (keypad display: OH51
e)
Verification
Connect the PTC input to a fixed resistor:
·
R > 4 k
W: A fault message OH3 or OH51 must be initiated.
·
R < 1 k
W: A fault message must not be initiated.