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Specification of SN200G high-performance vector convertor
Mechanical and electrical installation
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3.2.4 Terimal and wiring of main circuit
1) Description of terminal of main circuit for single-phase frequency convertor
Terminal marking
Name
Description
L1, L2
Input terminal of single-phase power Contact poin of single-phase 220V AC power
(+), (-)
Positive/negative terminals of DC bus Input point of DC bus
(+), PB
Connection terminal of brake
resistance
Connect brake resistance
U, V, W
Output terminal of convertor
Connect three-phase motor
PE\
Earthing terminal
Earthing terminal
2) Description of terminal of main circuit for single-phase frequency convertor
Terminal marking
Name
Description
R
、
S
、
T
Input terminal of three-phase power
Connection point of AC input three-phase
power
(+), (-)
Positive/negative terminals of DC bus
Input point of DC bus and brake unit
(+), PB
Connection terminal of brake resistance Connect brake resistance
P1, (+)
Connection terminal of external DC
reactor
Connection point of external DC reactor
U, V, W
Output terminal of convertor
Connect three-phase motor
PE\
Earthing terminal
Earthing terminal
Wiring precautions:
a)
Input power L1, L2 or R, S, T:
b)
Wiring on input side of convertor has no requirement on phase sequence. Wiring precautions:
1: (+) (-) terminals of DC bus: there’s residual voltage for DC bus (+) (-) immediately after
outage. Contact after CHARGE light extinguishes and confirm it’s <36V, otherwise there is risk of
electric shock.
2: When selecting external braking component, avoid inverse connection of (+) (-) polarity,
otherwise it will lead to damage of frequency convertor and even fire.
3: Wiring length of brake unit should not exceed 10m. Twisted pair or tight double-line should
be used for parallel wiring. Do not connect brake resistance directly to DC bus, otherwise it will
lead to damage of frequency convertor and even fire.
c)
Connection terminal (+), PB of brake resistance:
Confirm the model of built-in brake unit, and connection terminal of brake resistance is valid.
Model selection of brake resistance refers to recommended value and wiring distance should be
<5m, otherwise frequency convertor may be damaged.