Delta Electronics VFD037CH23A-21 — рекомендации по установке термозащит и тормозных резисторов [73/638]
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Delta Electronics VFD037CH23A-21 — рекомендации по установке термозащит и тормозных резисторов [73/638]

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Delta Electronics VFD037CH23A-21 [73/638] Parallel serie
Chapter 7 Optional Accessories
7-3
magnetic contactor (MC) prior to the drive for abnormal protection. The purpose of installing the thermal overload relay is to
protect the brake resistor from damage due to frequent brake, or due to brake unit keeping operating resulted from unusual
high input voltage. Under such circumstance, just turn off the power to prevent damaging the brake resistor.
MC
MOTOR
O.L.
SA
R/L1
S/L2
T/L3
NFB
MC
IM
Thermal relay
or Temperature Switch
Trip Contact
Varist or
Temperature
switch
VFD
U/T1
V/T2
W/T3
+(P)
- (N)
R/L1
S/L2
T/L3
VFDB
XXXX
B1
+
(P)
Thermal relay
Brake unit
-
(N)
MASTER
M1 M2
O.L.
Brake
Resistor
B2
VFDB
XXXX
B1
+
(P)
Brake unit
-
(N)
MASTER
M1 M2
B2
Thermal relay
O.L.
Brake
Resistor
22
Parallel Serie/
Temperature switch
。
When AC Drive is equipped with a DC reactor, please read user manual to know t
h
wiring method of input circuit of brake unit +(P).
Do Not connect input circuit -(N) to the neutral point of the power system.
2. If damage to the drive or other equipment is due to the fact that the brake resistors and brake modules in use are not
provided by Delta, the warranty will be void.
3. Take into consideration the safety of the environment when installing the brake resistors. If the minimum resistance value is
to be utilized, consult local dealers for the calculation of Watt figures.
4. When using more than 2 brake units, equivalent resistor value of parallel brake unit can’t be less than the value in the
column “Minimum Equivalent Resistor Value for Each AC Drive” (the right-most column in the table). Please read the wiring
information in the user manual of brake unit thoroughly prior to operation
5. This chart is for normal usage; if the AC motor drive is applied for frequent braking, it is suggested to enlarge 2~3 times of
the Watts.
6. Thermal Relay:
Thermal relay selection is basing on its overload capability. A standard braking capacity for CH2000 is 10%ED (Tripping
time=10s). The figure below is an example of 406V, 110kw AC motor drive. It requires the thermal relay to take 260%
overload capacity in 10s (Host starting) and the braking current is 126A. In this case, user should select a rated 50A thermal
relay. The property of each thermal relay may vary among different manufacturer, please carefully read specification.
60
40
30
20
10
Trippin
g
time
8
3
2
4
6
1
0.8
0.6
0.4
0.3
0.8 1
1.5
2
3
4
5
6810 1579
Multiple of current setting
xln (A)
Second

Содержание

1610

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