9
Electrical Connections
Integral solid state short circuit protection does not provide branch circuit
protection. Branch circuit protection must be provided in accordance
with the Manufacturer Instructions, National Electrical Code (NFPA70 or
CSA22.1) and any additional local codes.
The minimum voltage rating for protection devices used with 240V inverters
shall be 250VAC. The minimum voltage rating for protection devices used
with 480V inverters shall be 600VAC.
Fuses shall not be installed between the drive and the motor.
In PM motor applications where the drive input current can be lower than
the output current, it is allowed to use a protection device with a lower cur-
rent rating thus being able to optimize line side wiring and ancillary compo-
nents.
If the controller / elevator drive is supplied through an individual isolation
transformer, the maximum fuse amperage rating shall not be greater than
125% of the secondary current rating of the transformer per NFPA70 and
CSA 22.1. This value may be signicantly lower than the values in the
following tables.
Branch circuit protection for the F5 must be provided using the fuses
as listed in the tables 1.2.4.1 and 1.2.4.2 below. Fast Acting class J fuses
are recommended due to size and trip speed. Note the amperage value
is the maximum value. Lower values may be used based on the relative
sizing of the motor to the inverter. If there is an isolation transformer and
a harmonic lter installed, a high speed class J fuse must be used (only
Ferraz type HSJ or Bussmann type XXXX are approved).
Table 1.2.4.1 - 230V Units
SCCR UL 248 Semiconductor UL 489
Unit Size /
Housing
[kA]
rms
Class J
Rating [A]
Fuse Number* /
Rating [A]
MCCB [A] /
Siemens Cat. No.
13 / E 10 40
50 140 06 80 / 80
14 / G 10 50
50 140 06 100 / 100
15 / G, H 10, 18 70
50 140 06 80 / 80
16 / H 18 90 - -
17 / H 18 110 - -
18 / R 100 125 - - 150A / DG-frame 3VL 150 UL
19 / R 100 150 - - 150A / DG-frame 3VL 150 UL
20 / R 100 175 - - 250A / FG-frame 3VL 250 UL
21 / R 100 200 - - 250A / FG-frame 3VL 250 UL
23 / U 100 350 - - 400A / JG-frame 3VL 400 UL
* Semiconductor fuses are manufactured by Siba Fuse Inc. When using this type of fuse,
this is the model number of the fuse that must be used.
1.2.4. Fusing
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