Warner Electric ERD Size 060 to 300 - Manual (Page 12)

4 Warner Electric Europe • +33 (0)2 41 21 24 24 P-2060-WE • 2/13
In the event of AC switching, the braking response
time may be multiplied by 6.
To get very short brake release and braking
times, we advise the CBC 140-5 (please ask):
• With overexcitation on brake release, the start
time can be divided by 3 (according to the
supply voltage)
• Adjusting the hold voltage to 50% of
the nominal voltage reduces the brake
engagement time and its temperature rise
Warner Electric supply units provide protection for
coils and circuits. Where a brake is used without
our supply units, with switching on the DC, it is
essential for the coil to be pro tected against
surges by a varistor fitted in parallel.
6 Options
6.1 Torque adjustment
Torque adjustment is only possible on VAR02 ( ~
50% of nominal torque).
Brakes are supplied adjusted to nominal torque.
Principle of torque reduction:
On VAR 02 (table 3), undo the adjustment ring
located at the rear of the inductor (see chapter
7).
STANDARD version
HIGH TORQUE version
4.3 Spare parts
After several adjustments, variable according
to size and use, it is necessary to replace the
friction disc (see Fig. 3 and table 2)
To replace the friction disc(s) (312) or (315), undo
the fix ing bolts (913) or (914) then take off the
mounted induc tor (107) or (108) and then the
friction disc(s). Put the new friction disc(s) into
position then refit the mounted inductor and
adjust the airgap (see paragraph 4.1).
5 Electrical connection
ERD and ERDD HT brakes have to be supplied
with direct current and are factory fitted with
400 mm long wires. The polarity does not affect
operation.
5.1 Important recommendations
All works on the electrical connections have to
be made with power off.
Ensure compliance with the nominal supply vol-
tage (inadequate supply causes a reduction in
the starting distance).
The connecting wires should be of sufficient
diameter to prevent voltage drops between the
source and equipment supplied.
Tolerance for the supply voltage to the brake
terminals +5% / -10% (NF C 79-300).
5.2 Power supply
We advise the use of Warner Electric CBC 140
1, CBC 140-2 or CBC 140-5 supply units (with
overexcitation and holding voltage)
The supply and switching method has a great
influence on the response time. Response times
shown in our cat- alogues are for a supply at
nominal voltage with DC side switching.
E
Fig. 3
I (A) / L (m) 0 to 10 m from 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 3 (VAR02)
ERD Size 060 100 170 300
Nominal torque (Nm) 60 100 170 300
Max. number of turns
(adjustment ring)
3 3 4,5 5,5
Theoretical reduction in
torque for 1 turn of the
nut (Nm)
11 16 25 34
ERD Size 060 100 170 300
ERDD Size 120 200 340 600
Nominal torque (Nm)
80 130 220 400
160 260 440 800
Max. number of turns
(adjustment ring)
3 3 4,5 5,5
Theoretical reduction in
torque for 1 turn of the
nut (Nm)
15 21 32 45
30 42 64 90