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ISP - Rev 6/95
7.1.4 Activating the loss of tacho protection (velocity mode only)
Activating the loss of tacho protection is done by installing R14 (different
value for 65V or 135V amplifiers),R15, and R16 as follows:
1530
R14
(65V)
= ------- (Kohm)
Vam
2730
R14
(135V)
= ------ (Kohm)
Vam
100 x Vam
R15 = ----------- (Kohm)
Ip x Rm
R16 < 10 ohm
Vam - Armature voltage at maximum application speed.
Ip - Amplifiers' rated peak current limit.
Rm - Total ohmic resistance of motor.
R9 should be calculated and inserted according to the tacho voltage at maximum
application velocity (Vtm):
For Vtm > 7.5V:
insert R9 = 301Kohm.
For Vtm < 7.5V:
2250
R9 = ------- (Kohm)
Vtm