AXIS CURRENT

MAX 2, 3, 32

With FANUC & YASKAWA Drives

Most BMC machines have tapered gibs with screws at both ends of the gib, one to adjust the gib pressure and one to lock the gib. Over tightening of these screws can damage the gib. The adjusting screws are on the top for the Z axis, the left hand end of the table for the X axis and the front of the saddle for the Y axis. The BMC 40/50 have gibs at both ends of X axis and do not have the lock screws.

NOTE:The maximum rated current of the servo amplifiers must not be exceeded.

The rated current for BMC 20/30 OEM/V1, FANUC MODEL 0/5, = 10 AMPS Peak.

The rated current for BMC 40/50 OEM/V1, FANUC MODEL 10, = 15 AMPS Peak.

The rated current for BMC 20 V2, (pre LR) YASKAWA AMPS, = 11 AMPS Peak.

The rated current for BMC 20 LR/25/30 V2,YASKAWA AMPS, = 17 AMPS Peak.

The rated current for BMC 40/50 V2, YASKAWA AMPS, = 42 AMPS Peak.

The ULTIMAX 3 Multibus machines use the same amps as MAX 2 V2 machines.

THE PROCEDURE FOR MONITORING FANUC AXIS CURRENT IS AS FOLLOWS:

1Connect a DVM positive lead to CH 10, 11, OR 12.

Note: There are three sets of test points L, for X axis M for Y axis & N for Z axis.

2Connect negative lead to CH3.

3Set meter for VAC.

4Jog the axis at 100 IPM.

5The voltage reading on the meter is a VOLTS/AMP reading.

EXAMPLE: The meter reads .255 VAC. This is equal to 2.55 AMPS of current.

6The axis being checked should be run full travel in both directions.

Note The lowest and highest readings seen.

BMC 20 / BMC 20 LR / BMC 25/30 / BMC 40/50
X axis / 2.5 to 3.5 / 1 to 2 / 2 to 4 / 3 to 5
Y axis / 2.5 to 3.5 / 1 to 2 / 2 to 4 / 3 to 5
Z+ axis / 4 to 5 / 2 to 3 / 2 to 4 / 4 to 6
Z- axis / 3 to 4 / 1 to 2 / 1 to 2 / 2 to 4

YASKAWA AXIS CURRENT CHECKS

1.Check Axis Setup per Eng Doc # 757-4001-092. Check all axis.

2.To check axis current draw, Connect a DVM with the positive lead to TM3-4 and the negative
lead on the 0V of the appropriate axis amplifier.

Note: Check all axes in both directions at 100 ipm over the full travel of the axis.

3.Divide the meter reading by the appropriate value listed below.

1 amp on aBMC 20 = .789BMC 20 LR / 25 / 30=.484 VDCBMC 40/50=.200 VDC

Acceptable values are:

BMC 20: X&Y=2.5-3.5 A 1.973 - 2.762 VDCBMC 20LR: X&Y=1-2 A 0.484 - 0.968 VDC

BMC 20: +Z=4-5 A 3.156 - 3.945 VDCBMC 20LR: +Z=2-3 A 0.968 - 1.936 VDC

BMC 20: -Z=3-4 A 2.367 - 3.156 VDCBMC 20LR: -Z=1-2 A 0.484 - 0.968 VDC

BMC 25/30 X&Y=2-4 A 0.968 - 1.936 VDCBMC 40/50 X&Y=3 - 5 A 0.6 - 1.0 VDC

BMC 25/30 +Z=2-4 A 0.968 - 1.936 VDCBMC 40/50 +Z =4 - 6 A 0.8 - 1.2 VDC

BMC 25/30 -Z=1-2 A 0.484 - 0.968 VDCBMC 40/50 -Z =2 - 4 A 0.4 - 0.8 VDC

When adjusting gibs on any mill use caution. Do not tighten them too much. The BMC 20 box way machines may not be able to reach the currents specified. If you can not adjust for the recommended currents, ensure that you have gib pressure by loosening the gibs until you have the minimum current (no further drop) then tighten gibs to obtain an increase in current draw. Be sure to verify axis operation by a cutting test, ETC.