WITTUR WSG-10, Operating And Maintenance Manual

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Page 17
Date 11.29.2016
Version A
Code J40069
Subject to changes without notice!
Gearless Synchronous Lift Machines
WSG-10
Operating and Maintenance Manual
The brakes are supplied and held with 110V DC .
75-80V DC for holding voltage is preferred for best
performances in temperature rise. The connecting
contacts for the micro-switches which monitor the
brakes are also accommodated in this terminal box.
The rectifier has to be prepared by customer.
The switching state of the brakes is monitored
using dust-proof micro switches with gold contacts.
NC contact is prepared in terminal box.
A.c. side switching is recommended for normal
operation, since the lift machine is then decelerated
in a controlled manner to zero speed and the
switching noise of the brake is negligible.
(emergency stop) or during an inspection from the
d.c. side, since this ensures a faster braking effect
with the car being stopped earlier.
It is therefore recommended to use 2 separa te
contactors for the brake control circ uitry , one of
which switching at the d.c. side, the other one at the
a.c. side.
10.4 Brake
Note on the use of d.c./a.c. side switching:
Monitoring the brakes
D.c. side switching
• Noisy switching.
• Burn-up protection for switching contact required.
(e.g. varistor , free-wheeling diode)
• Fast application of the brake.
A.c. side switching
• Low-noise switching of the brake.
• No protective measures required for switching contact.
• Slow application of the brake.
Attention: schematic diagram!
Attention: schematic diagram!
Please refer the connection advice in the
box for connecting according to request of
the control system as following,
Connect Power on the brake
C1-O close
C2-O close
Danger