Nord Drivesystems SK 510P - Page 182

NORDAC PRO (SK 500P) – Users Manual for Frequency Inverters
182 BU 0600 en-2319
E003
3.0
I
2
t overcurrent limit
a.c. inverter: I
2
t limit has triggered, e.g. > 1.5 x I
n
fo
r 60s
(see P504)
• Continuous overload at FI output
• Possible encoder fault (resolution, defect,
connection)
3.1
Chopper overtemperature I
2
t
Brake chopper: I
2
t limit has activated, 1.5 times value
reached for 60s (see to P554 if present, as well as P555,
P556, P557)
• Avoid overcurrent in brake resistance
3.2 IGBT overcurrent
125 % monitoring
De-rating (power reduction)
• 125 % overcurrent for 50 ms
• Brake chopper current too high
• for fan drives: enable flying start circuit (P520)
3.3 IGBT overcurrent fast
150 % monitoring
De-rating (power reduction)
• 150 % overcurrent
• Brake chopper current too high
3.7
Power limit
Input current too high
• Reduce load
E004 4.0 Overcurrent module Error signal from module (short duration)
• Short-circuit or earthing fault at FI output
• Motor cable is too long
• Use external output choke
• Brake resistor faulty or resistance too low

Do not switch off P537!
The occurrence of a fault can significantly shorten the
service life of the device, or even destroy it.
4.1 Overcurrent measurement
"Overcurrent measurement"
P537 (pulse current switch-off) was reached 3x within 50 ms
(only possible if P112 and P536 are disabled)
• FI is overloaded
• Drive sluggish, insufficiently sized,
• Ramps (P102/P103) too steep → Increase ramp time
• Check motor data (P201 … P209)
4.5 Overcurrent / short circuit in
the brake rectifier
Overcurrent / short circuit in the
brake rectifier
• Electromechanical brake defective
• Electromechanical brake connected with
impermissible electrical data
 Check the connection data