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Warner Electric PCBC-1525_1225 User Manual

Page 14

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14

Warner Electric • 800-825-9050

P-214

819-0518

Notes: Build-up time equals current to approximately 90% of steady state value and flux to 90%.

Decay time equals current to approximately 10% of steady state value and flux to 10%.

Approximately because current leads or lags flux by a small amount.

Coil Data

Unit Size

PB & PC-825

PB & PC-1000

PB & PC-1225

PB & PC-1525

Voltage — DC

6

24

90

6

24

90

6

24

90

6

24

90

Resistance @ 20°C — Ohms

1.27 20.4 223.3

1.23 19.7 248.7

1.33 22.3 261.7

1.45 19.8 258.4

Current — Amperes

4.74 1.18

.4

4.87 1.22

.36

4.5 1.08

.34

4.13 1.21

.35

Watts

28

28

36

29

29

33

27

26

31

25

29

31

Coil Build-up — Milliseconds

170

170

170

205

220

235

300

320

350

470

490

512

Coil Decay — Milliseconds

70

75

80

70

75

80

190

190

190

200

170

140

Burnishing and Maintenance
Burnishing

Intimate metal to metal contact is essential
between the armature and the metal rings (poles)
of the magnet or rotor. Warner Electric clutches
and brakes leave the factory with the friction mate-
rial slightly undercut to assure good initial contact.

Normally, the desired wearing-in process occurs
naturally as the surfaces slip upon engagement.
The time for wear-in, which is necessary to obtain
the ultimate torque of the unit, will vary depending
on speed, load, or cycle duty.

If maximum torque is required immediately after
installation, the unit should be burnished by slip-
ping the friction surfaces together at reduced volt-
age. It is recommended that the burnishings be
done right on the application, if at all possible.

Burnishing at high speed will result in a smoother
wear-in pattern and reduce the time for burnishing.
The voltage should be set at approximately 30%
or 40% of the rated value.

The unit should be cycled on and off to allow suffi-
cient time between slip cycles to prevent overheat-
ing.

When a Warner Electric brake or clutch is properly
assembled and installed, no further servicing, lubri-
cation, or maintenance should be required
throughout the life of the unit.

Maintenance

Wear Pattern: Wear grooves appear on the
armature and magnet surfaces. This is a normal
wear condition, and does not impair functioning of
the unit. Normally, the magnet and armature, as a
mating pair, will wear at the same rate. It is the
usual recommendation that both components be
replaced at the same time.

Remachining the face of a worn armature is not
recommended. If a replacement armature is to be
used with a used magnet, it is necessary to rema-
chine the worn magnet face. In refacing a magnet:
(1) machine only enough material to clean up the
complete face of the magnet; (2) hold the face
within .005" of parallel with the mounting plate;
and (3) undercut the molded facing material .002"
- .004" below the metal poles.

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