www.maxcessintl.com
Global Brake Series
MI 850A169 1 L
Page 9 of 14
RATED COIL CURRENTS
NOTE:
The coil system has changed from Class A to Class F. Refer to the nameplate on your unit to determine
which insulation class you have. If you have Class F insulation, the nameplate will denote Class F. If you have
Class A, there will be no notation on the nameplate. All new brake products have Class F coils.
Rated Current, Amp DC
Coil Voltage, VDC
24
90
Model
Class F
Class F
GBA, GBAM
0.76
0.16
GBB, GBBM
1.00
0.21
GBC, GBCM
1.18
0.32
GBD, GBDM
1.54
0.39
GBE, GBEM
1.58
0.46
GBF, GBFM
1.61
0.53
Legacy
Models
(Before 2003)
Rated Current, Amp DC
Coil Voltage, VDC
24
90
Model
Class A
Class A
GBA, GBAM
0.60
0.15
GBB, GBBM
0.88
0.19
GBC, GBCM
1.25
0.28
GBD, GBDM
1.36
0.37
MAXIMUM COIL CURRENTS AT 0
⁰
C
This table shows the maximum current draw at rated voltage when the coil is at 0
⁰
C.
MAINTENANCE
WARNING
– Death or injury can result from electric shocks.
Maintenance and repair of the brake device must be performed when there is no electrical power in the
system.
WARNING
– Danger of injury from crushing.
Maintenance and repair of the brake device must be performed only when the machine has been
stopped and has been secured from being turned on again.
WARNING
– Danger of falling down or muscle or skeletal injury during maintenance and repair.
The brake devices, especially the larger designs, are heavy. Appropriate equipment is to be used and
the safety rules of the company must be observed.
Due to its small number of moving components and its basic design, maintenance of the brake is generally
necessary only after extended service. The main loss of function occurs by the magnetic powder eventually
deteriorating and manifests itself as the maximum torque of the brake slowly decreasing until it no longer
produces sufficient torque for the application. When a problem appears in the system, ensure that all couplings,
belts, etc., and the control device are functioning properly. Use the Troubleshooting guide below to determine the
cause of the problem. For general maintenance, the brakes can be rebuilt with a repair kit. A repair kit includes a
new powder charge and the appropriate bearings, seals and snap rings generally needed to rebuild the unit.
NOTE:
When ordering parts not contained in the kit, provide the model number, serial number and parts list item
number and description from Figure 1.
Maximum Current @ 0°C, Amp DC
Coil Voltage, VDC
24
90
Model
Class A Class F
Class A
Class F
GBA, GBAM
0.94
1.32
0.25
0.28
GBB, GBBM
1.06
1.75
0.28
0.37
GBC, GBCM
1.56
2.06
0.42
0.55
GBD, GBDM
2.03
2.68
0.54
0.69
GBE, GBEM
---
2.76
---
0.80
GBF, GBFM
---
2.98
---
0.93
