R&M Materials Handling VARIABLE SPEED CONTROLS ControlMaster Select Service Manual - Manual (Page 13)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
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R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
The table below is based on ED ≤ 60% (60% duty cycle) and an ambient temperature of +40°C (104°F).
A higher ambient temperature may require increased cable sizes. The input current does not exceed the
continuous current (Icont) of inverter, so it is selected to be the dimensioning current. If the actual load
current is below inverter continuous current, then the fuses and the supply cable may be dimensioned
according to the load current.
Power class 002F 003F 004F 005F 007F 011F 015F 018F 022F
Continuous current I
CONT
A 5.0 8 10 13 18 24 32 42 48
Fuse A 10 10 10 16 20 25 35 50 50
Max motor cable length m 50 50 50 50 50 50 50 50 50
Ft 160 160 160 160 160 160 160 160 160
Motor cable 40 o C mm 2 1.5 2.5 2.5 2.5 4 6 10 10 10
104 o F AWG 14 14 14 12 10 10 8 8 6
Braking resistor cable 40 o C mm 2 2.5 2.5 2.5 2.5 2.5 2.5 2.5 4 4
104 o F AWG 14 14 14 14 14 14 14 12 12
3.2.4 Cable protection
To protect the supply cables against short circuit there must be fuses or motor circuit breakers (MCCBs)
installed at the mains end of the supply cable. Dimensioning of the fuses or MCCBs depends on the
cable used and on the type of primary fuses or MCCBs. If there are no other regulations, the values given
in this section can be used to dimension fuses (three phase 400V power supply).
The overload protection of inverter protects both the supply and the motor cables. The fuses of the
supply provide the short circuit protection.
3.2.5 Cable length
The maximum motor cable lengths in the preceding table are based on 150% of inverter rated current
(=current during acceleration) and a 2.5 % voltage drop in the cable. For longer cables, the required
conductor cross sectional area A (mm2) is given by formula
U p
I l
A F
Ч
Ч Ч
Ч =
5 . 1
43 . 2
where l is the cable length (m)
I
F
is the motor current (A) at shaft power P
F
p is the allowed voltage drop in %
U is the nominal motor voltage
3.2.6 Du/dt filters
Du/dt filters should be used also in IT-network.
3.2.6.1 002 – 004
Du/dt filter at motor supply is needed if
- Motors are not made for inverter use
- Inverter is not mounted on the crane
- Number of motors is greater than 2
- Total motor cable length is over 100m (330ft)