Yaskawa GPD503 Drive - Manual (Page 155)

6. The Braking Unit and Braking Resistor Unit MUST BE GROUNDED. Observe the
following precautions:
• Use grounding leads conforming to your National Electrical Code.
• If the installation requires the Braking Resistor Unit to be used without its
enclosure (with grounding terminal), ground it by attaching a ground lead
at one of the mounting screws.
• Grounding resistance of the Braking Unit should be 100 ohms or less.
A7-6
Figure A7-4. Wiring Single Braking Unit and Braking Resistor Unit to Drive
(230V 15-30HP(CT), 460V 25-60HP(CT), 575V 30-50HP(CT))
T1
T2
T3
R
S
T
U
V
W
GPD 503
CONTROL
PCB
3 11
B0/– B1/+
PART OF USER SUPPLIED
EXTERNAL
CIRCUIT
BRAKING
UNIT
B
P
N
3
1OL
1M
1M
1M
CB
L1
L2
L3
120VAC
THRX
FAULT
CONTACT
THRX
RC
1M
RC 1M
THRX
POWER
ON
POWER
OFF
BRAKING
RESISTOR
UNIT
1
2
1THG
B
P
P
o
GND
(E)
4