Lenze ECSCExxx Power supply module - Manual (Page 107)

Monitoring functions
Configuring monitoring functions
Brake chopper IGBT monitoring (OC4)
9
l
107 EDBCSXE040 EN 7.0
9.3.7 Brake chopper IGBT monitoring (OC4)
The brake chopper IGBT is monitored independently of the brake resistor (internal or
external). There are two types of monitoring causing a TRIP "OC4":
ƒ The voltage U
CE
is monitored by hardware. Monitoring is triggered by a
low−resistance brake resistor. This error can be reset by a TRIP reset.
ƒ It is also monitored whether the IGBT itself has a low resistance. For this purpose the
voltage across the brake resistor is used. This error cannot be reset by a TRIP reset.
Possible causes are:
– Low−resistance IGBT,
– wrong wiring of the brake resistor or
– defective brake resistor / IGBT.
)
Note!
A TRIP "OC4" can occur even if no brake resistor is connected.
9.3.8 Device utilisation / I x t monitoring (OC5)
Use the mains fuses (
^ 43) to ensure device protection.
A single−phase I x t monitoring measures the load of the power supply module. The
monitoring enables operation with:
ƒ a permanent device output current = I
r
ƒ a device output current of up to 1.5 x I
N
for
£ 30 s
The power supply module calculates the device load in percent via the mains current. If this
value exceeds 100 %, TRIP "OC5" is triggered. The TRIP can only be reset if the load has
fallen below 95 %. The current value is indicated under C0064.
Parameter
C0064
Designation
Device utilisation (I x t)
Data type: INTEGER_32
Index: 24511 dec = 5FBF hex
Display of the device utilisation (I x t) over the last 180 s
l C0064 > 100 % activates OC5−TRIP.
l TRIP−RESET is only possible if C0064 < 95 %.
Display range (min. value | unit | max. value)
0 % 65535