User manual

3U Servo Amplifier
SYSTEM WIRING
MAIN
POWER
EARTH
BLOCK
MCR
EARTH
FRAME
GARxx
SHUNT
RESISTOR
BLK
BLK
24V
POWER
SUPPLY
Fusing
BLK
RED
BLK
+24 V
RED
24 V RET
SCREW HEAD
Twisted Wires
Motor#1
TB1
L3
L1
L2
3UBP8A
Backplane
J2
AC INPUT
GND
+24V
3U042 Geo Direct PWM drive
J3
FAN
GND
24V
WHT
WHT
300-603730 - 10x
Motor#2
UW Mo tor # 2
BLK
BLU
WHT
V
UW
Motor #1
GRN\YEL
BLK
BLU
WHT
V
EAR TH
TB2
SHUNT
SHUNT RTN
Optional
EMI FILTER
Twisted Wires
WARNING:
Installation of electrical control equipment is subject to many regulations including
national, state, local, and industry guidelines and rules. General recommendations
can be stated but it is important that the installation be carried out in accordance
with all regulations pertaining to the installation.
Fuse and Circuit Breaker Selection
In general, fusing must be designed to protect the weakest link from fire hazard. Each Geo drive is designed
to accept more than the recommended fuse ratings. External wiring to the drive may be the weakest link as
the routing is less controlled than the drive’s internal electronics. Therefore, external circuit protection, be it
fuses or circuit breakers, must be designed to protect the lesser of the drive or external wiring.
High peak currents and high inrush currents demand the use of slow blow type fuses and hamper the use
of circuit breakers with magnetic trip mechanisms. Generally, fuses are recommended to be larger than
what the rms current ratings require. Remember that some drives allow three times the continuous rated
current on up to two axis of motion. Time delay and overload rating of protection devices must consider
this operation.
Use of GFI Breakers
Ground Fault Interrupter circuit breakers are designed to break the power circuit in the event that
outgoing currents are not accompanied by equal and opposite returning currents. These breakers assume
that if outgoing currents are not returning then there is a ground path in the load. Most circuit breakers of
this type account for currents as low as 10mA PWM switching in servo drives coupled with parasitic
capacitance to ground in motor windings and long cables generate ground leakage current. Careful
installation practices must be followed. The use of inductor chokes in the output of the drive will help
keep these leakage currents below breaker threshold levels.
Transformer and Filter Sizing
Incoming power design considerations for use with Geo Drives require some over rating. In general, it is
recommended that all 3-phase systems using transformers and incoming filter chokes be allotted a 25%
Backplane Board 9