User manual

94/164 Bosch Rexroth AG NYCe4000 Standard Housings and Accessories Manual
NY4930 Brake Unit
12.6 Installation
The position of the Brake Unit in a NYCE4000 system is shown in Fig. 84.
Fig. 84 Position of the NY4930 in the NYCe4000 system
 See chapter 12.5 for the connections of the NY4930 Brake Unit.
 Make sure that you connect an appropriate cable to the Protective Earth
connection screw. Use a toothed washer between the housing and the cable
connection to guarantee a good electrical connection, see also chapter 18.
 The airflow goes through the Brake Unit from the bottom to the top. Make sure
that cables do not obstruct the free flow of air.
 If convection cooling is not sufficient, you can install forced cooling using the
NY4922 Fan Unit.
Adjustment of working voltage range and over-voltage range
On the front of the NY4930 Brake Unit are 2 rotary switches. Looking at the front
of the NY4930, the rotary switch at the left side is the working voltage range
selector, and the rotary switch at the right side is the over-voltage range selector.
Both switches have 4 positions. On the working voltage range selector the highest
voltage range is available on 2 positions, and on the over-voltage range selector
the highest over-voltage range setting is available on 2 positions. Fig. 85 shows
the selectors for the NY4930/20. The working voltage range selector settings are
different for the different NY4930 models. The over-voltage range selector
settings are identical for all NY4930 models.
The working voltage selector is set to the used drive voltage.
The over-voltage selector sets the maximum allowable over voltage (increased
due to regeneration energy) when the Brake Unit starts operation in state 4, see
chapter 12.2.
At a working voltage of 150 Volt the 15% and 20% over-voltage settings are not
allowed, because 165 Volt is the maximum allowed voltage. This only applies to
the NY4930/20.
Note:
Change a switch setting only while power is switched off.