CHAPTER 5: MAIN CIRCUIT TERMINAL
63-4528-04 24
B1, B2 Connections for brake resistor (optional)
Grounding connection, please comply with local regulations.
Main power terminals
• Do not connect 3-phase model to one-phase power. It is unnecessary to consider phase-sequence
for these terminals R/L1, S/L2 and T/L3.
• It is recommended to add a magnetic contactor (MC) in the power input wiring to cut off power
quickly and reduce malfunction when activating the protection function of the VFD. Both ends of the
MC should have an R-C surge absorber.
• Securely fasten the main circuit terminals to prevent sparks which can be made by the loose screws
due to vibration.
• Use voltage and current within the specification.
• When using a general GFCI (Ground Fault Circuit Interrupter), select a current sensor with
sensitivity of 200mA or above and not less than 0.1-second operation time to avoid nuisance
tripping.
• Use shield wire or tube for the power wiring and ground the two ends of the shield wire or tube.
• Do NOT stop the VFD by cutting the power. Stop the VFD using RUN/STOP command via control
terminals or keypad. If you must stop the VFD by turning the power OFF. Do not do so more than
once per hour.
Output terminals for main circuit
• When installing a load filter at the output side of terminals U/T1, V/T2, W/T3 of the VFD, please use
inductance filter. Do not use phase-compensation capacitors or L-C (Inductance-Capacitance) or R-
C (Resistance-Capacitance), unless approved by Honeywell.
• DO NOT connect phase-compensation capacitors or surge absorbers at the output terminals of the
VFD.
• Recommended using an inverter duty-rated motor.
Terminals for connecting DC reactor, external brake resistor, external brake resistor and DC
circuit
• These are the terminals used to connect the DC reactor to improve the power factor. For the factory
setting, it connects the short-circuit object. Please remove this short-circuit object before connecting
to the DC reactor.
• Connect a brake resistor or brake unit in applications with frequent deceleration ramps, short
deceleration time, insufficient brake torque or requiring increased brake torque.
• The external brake resistor should connect to the terminals (B1, B2) of the VFD.
• For those models without built-in brake resistor, connect external brake unit and brake resistor (both
of them are optional) to increase brake torque.
• When the terminals +1, +2 and - are not used, leave the terminals open.
• DO NOT connect [+1, -], [+2, -], [+1/DC+, -/DC-] or brake resistor directly to prevent drive damage.
Table 1. Control Connections
M33251
DC REACTOR (OPTIONAL)
+1
+2
BRAKE RESISTOR
(OPTIONAL)
M33252
B1
B2
+
–
BRAKE RESISTOR
(OPTIONAL)
BRAKE UNIT
(OPTIONAL)
BR
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