Donati DRH 1 Series, Инструкция по эксплуатации

Страница: 104 / 130

MAN16MG05
instructions for use series drh
1/2/3/4 -
dst
/
n
/
s
-
dst
/
r
-
drt 102
6.4.3 Setting the braking torque on the traversing motor
To adjust the brake on the travel motors, whether externally regulating the braking torque A) , or recovering the
braking clearance internally B) , the following PRELIMINARY OPERATIONS must be observed:
1. Cut off the trolley’s power supply by pressing the emergency stop button -1- ; set the line cut-off switch lever to
the “O” or “OFF” position, then safely access the work area, taking the keypad up to the work area so as to avoid
its being activated from the ground (fig. 153).
2. Operating from the raised work area, remove the plastic grid (vent) by completely unfastening the four screws
(fig. 154).
• The self-braking trolley motor features axial rotor shifting.
• The braking action is mechanical and is provided by a conical braking block that is integral with
the rotor, which, in the absence of power, is pushed by a spring in contact with the brake cover’s
braking lining.
• The asbestos-free brake linings are subject to a more or less accentuated wear, depending on the
operating intensity.
• Wear on the brake linings increases the gap between the lining and the braking block. This results
in a progressive loss of braking torque, with a consequent sliding of the brake and longer bra -
king spaces required; for this reason, the brake must be adjusted accordingly.
• The braking torque can be set either:
A) By setting the braking torque externally, for limited wear or in modifying preset torque
parameters
B) By recovering the brake clearance internally, for excessive wear on the brake lining
resulting in an increased axial travel for the motor shaft > than 1 mm.
Adjustments to the trolley motor brake:
A) External adjustment of the braking torque
B) Internal recovery of the braking clearance
fig. 153 fig. 154
1
103 instructions for use series drh
1/2/3/4 -
dst
/
n
/
s
-
dst
/
r
-
drt
MAN16MG05
A) - External adjustment of the braking torque:
• To increase or decrease the desired braking torque , proceed as follows:
1. Loosen the central Allen screw (fig. 155).
• To increase the braking torque: remove one or more washers until obtaining the desired increase in bra-
king torque (fig. 156). With all the washers inserted below the Allen screw, the spring thrust is at a mini-
mum, and consequently so is the braking torque.
2. Reposition the central Allen screw (with the desired number of washers) and securely tighten the Allen screw
(fig. 157).
3. Perform running and braking tests, and if necessary repeat the operations outlined above until obtaining the desi-
red braking torque, after having reassembled the vent and securely tightened the Allen screws (fig. 158).
159
160
159
160
fig. 155 fig. 156
161
162
161
162
fig. 157 fig. 158
If several attempts are made at adjusting the braking torque and the desired braking space is not
obtained, proceed as outlined under “Internal recovery of the braking clearance”.
KMAN16MG05