Lenze 8200 Frequency inverters - Manual (Page 194)

Configuration
8200SHB0199 7-57
Series “HVAC”:
Function - DC braking enables fast deceleration of the drive to standstill without using a brake unit.
- The brake torque is lower as for braking in generator mode (via chopper or DC-bus operation).
- The possible brake torque is approx. 20 % ... 30 % of the rated motor torque.
- A brake voltage or a brake current can be selected.
- C196 enables an improved motor start when the automatic DC-injection brake is activated
(e.g. for hoists).
- The DCB function is activated either automatically when falling below the threshold set under
C019 or via dig. input terminals E1 ... E4 (depending on C007).
- With the auto-DCB function, also a dead band in the setpoint can be set via C019. If DC
braking is not required here, set C106 = 0.
Adjustment 1.Select, whether a brake voltage (C035 = -0-) or a brake current is to be entered.
2.Select the brake voltage or brake current in per cent under C036.
- With C035 = -0-, the indication refers to the rated controller voltage [V
r
].
- With C035 = -1-, the indication refers to the rated controller current [I
r
].
3.Select how to activate the DC-injection brake (DCB):
- Via terminals E1 ... E4
- Automatically
Activation via terminals
E1 ... E4 Setting C007 High level at Function
-17- Terminal E1 * DCB remains active until a LOW signal is
assigned to terminal E1.
-3-, -7-, -14-, 19 Terminal E2 * DCB remains active until a LOW signal is
assigned to terminal E2.
-0-, -5-, -11-, -25-,
-29-, -41-, -42-, -48- Terminal E3 * DCB remains active until a LOW signal is
assigned to terminal E3.
-31-, -36-, -51- Terminal E4 * DCB remains active until a LOW signal is
assigned to terminal E4.
* The signal levels are indicated for C114 = -0- (see chapter 7.5.14.1).
Automatic activation 1.Select under C106:
- C106 = 0,00 - auto DCB is not active (no reaction on f
d
< C019).
- C106 > 0.00 - the DC injection brake is active for the time set. Afterwards, the drive will set
controller inhibit.
2.Select the input conditions for the automatic DC injection braking under C196.
- C196 = -0- DCB active, if C050 < C019
- C196 = -1- GSB active, if C050 < C019 and setpoint < C019
3.Set the operating threshold under C019.
- The operating threshold indicates, when the DC injection brake is activated (see step 2.).
Important - C035 = -1-
- The DC motor current is directly set under C036 (ref. to rated controller current).
- C035 = -0-
- The DC motor current is indirectly set under C036 (ref. to rated controller voltage).
- Please observe, that the connected motor can be overheated by overlong operation and excessive
DC-motor current.
Special features - Set the operating threshold for auto DCB under C019. The display value of the parameter can be
related to an application datum (C500, C501) (see chapter 7.6.3.)
- With C106 = 0.00, the automatic DC-injection brake is not active.
- C035 and C196 are only stored in parameter set 1.
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