Warner Electric ERDD - Manual (Page 4)

4 Warner Electric Europe • +33 (0)2 41 21 24 24 P-2062-WE • 2/13
Electric leads must be large enough to prevent
voltage drops between power supply and the
unit.
Supply voltage tolerances on the brake : +5% /
-10% (NF C 79-300)
5.2 Power supply
We recommend the use of Warner Electric power
supply CBC 140-5 (with over-excitation and
handling voltage).
The switch on/switch off process has a major
effect on the response time. Response times
listed in the catalogue refers to nominal supply
voltage with switching on DC side.
If switching on the AC side, the response time in
braking can be multiplied by 6.
• If over-excitation occurs during drop-out, the
pull-indistance can be divided by 3
(depending on net voltage).
• When the operating voltage falls to
50% of the nominal value it reduces braking
response
time and working temperature.
Warner Electric power supplies are designed to
protect the coils and circuitry. If the brake is used
power off with switching on DC side, it is essential
to protect the coil with a varistor mounted in
parallel.
4 Maintenance
4.1 Airgap setting
To adjust the airgap (see appendix 1 or 2), loosen
the lock ing screws (909), then turn the adjusting
screws (902) adjusting to the airgap required.
Tighten the locking screws (909) to the required
torque (see table 1).
Check the airgap value again at various points
near the faces of the friction plate.
Energise the brake a number of times whilst the
motor is static, re-check the airgap value at the
various points.
4.2 Maintenance
Friction material wear generates an increase
in the airgap value. To reach the maximum airgap
(see table 1), it is necessary to set it (see Chapter
4.1).
4.3 Spare parts
After continued operation varying according to
unit size and use, it may become necessary to
replace
one or more friction discs when the minimum
value Y is reached (see Fig. 3 and table 2).
To proceed see chapter 3-3. Re-adjustment of the
airgap is necessary (see chapter 4.1).
5 Electrical connection
The brakes ERD & ERDD must be supplied with
D.C volt- age and are fitted with a 500 mm length
cable. Polarity does not affect the functioning.
5.1 Important recommendations
All works on the electrical connections have to be
made with power off.
Note carefully the nominal supply voltage (low
sup- ply voltage generates low pull-in
distance).
I (A) / L (m) 0 to 10 m von 10 to 20 m
0 to 3 (A) 1,5 mm 2 1,5 mm 2
3 to 6 (A) 1,5 mm 2 2,5 mm 2
Table 2
Y
Fig. 3
ERD 500 800 1600 3200 6400 12800
Y min (mm) 2 2 2 3 4,5 3
ERDD 1000 1600 3200 6400 12800 25600
Y min (mm) 3 3 3,5 3,5 3 3