Urschel G-A - Replacing the Solenoid Coil

S.7Supplement
Brake Maintenance
Replacing the Solenoid Coil
The solenoid coil (1) used in the 10
pound-foot brake on a standard machine is a
multiple voltage and dual frequency coil with
four leads* (also called a quad coil). For a
machine with direct-on-line starting, power is
supplied to the coil from the motor windings.
For a machine with a variable frequency
drive (2), power is supplied to the coil from
the transformer in the electrical enclosure.
See the chart below. The coil leads must be
correctly connected to the terminal strip (3)
based on the supplied voltage. See the label
(4) below the terminal strip.
A 200-240 volt dual frequency coil
with three leads was supplied on earlier
machines. This coil can be replaced by the
multiple voltage coil described above in most
installations. The 200-240 volt coil can be
used when voltage is greater than 240 volts
at the coil. See the following pages and parts
information at the end of this supplement.
Note that non-standard machines may
require a different coil.
NOTICE
An incorrect supply voltage will cause the
coil to fail prematurely. Incoming voltage
must be within +/-5% of the voltage specied
by the label on the electrical enclosure.
(continued on the following page)
* Machines sold in Canada use a 575 volt coil; see the parts list at the end of this supplement.
4
Solenoid Coil, Multiple Voltage
Brake
Motor
Starting
Method
Power Source
for Coil
Voltage
to Coil
Frequency
DOL* Motor
Windings
200-240 50/60
VFD** Transformer 110-115 50/60
* Direct-On-Line
** Variable Frequency Drive
1
2
3