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Installation
DC Side – Independent Contactor Switching – Phase to Phase – Long Distance Connection
Switching: DC Side
Line Voltage: 208VAC
Line Voltage: 230VAC
F
= Class CC fuse max. 5A
brk
Optional redundant contactor for safety
When DC side switching and the conductor length is greater than 20m it is possible a
higher than normal voltage can appear at the rectifier. In this scenario an additional MOV
is required to clamp the voltage at the brake.
4.3 Maximum Switching Cycles – DC Side Switching
The maximum cycle rate is defined by the energy storage of the magnetic coil in the
brake. When the brake is de-energized via the DC side switching, some of the energy is
absorbed by the varistors in the rectifier. High cycle rates together with large brake coils
can result in an overload of the rectifier.
In these cases, the following MOVs may be used externally, connected in parallel to the
brake as shown in figure 4.2.8. The voltage rating of the MOV is dependent on the supply
voltage of the rectifier. The following combinations are recommended.
Supply Voltage
120V, 208V, 230V, 240V
400V, 480V
2021 KEB America, Inc.
©
Figure 4.2.8
Rectifier: Half-wave
Input Voltage: 208VAC
Input Voltage: 230VAC
K
= min 300VDC 9A AC3
brk_dc
K
= min 300VAC 5A AC1
brk_ac
KEB Material Number
0090045-2753
0090045-6255
Model Number: 0491010-CE07
Coil Voltage: 95VDC
Coil Voltage: 105VDC
MOV: 0038611-001U
625Vrms / 1000Vpk / 500J
Installed at the brake
Varistor Voltage
275VACrms
625VACrms
19
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