7ML19985FM01 MFA 4p - INSTRUCTION MANUAL Page 11
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Wiring
Wiring
MFA 4p Wiring for Automatic Start Delay
Should the Time Delay feature on start-up not be required, power should be applied
continuously from a separate source and the potentiometer turned to zero. This is usually
necessary for automatic up-stream start up of conveying devices after the down-stream
drive has reached its operation speed.
Notes:
1. Interlocks and Safety Pull Switches are not shown.
2. If START is initiated by programmable logic controller, closure time may be too
brief to allow MFA 4p contact to latch. In this case, program a timer contact
into the circuit.
3. CSA requires an 8A or less fuse to protect contacts. For 240 V AC, protect the
contacts with a 1500 VA transformer as well.
M
M
N
N
L
L
TB-1
TB-1
CONTACTOR
CONTACTOR
MFA 4p
MFA 4p
12
1
1
L L/N
START
115/230V AC 50/60 HZ
START
OR
STOP
STOP
SEE NOTE 3
SEE NOTE 3
SEE NOTE 2
MFA 4p
MFA 4p
TB-1
TB-1
HOLD UNTIL UP TO SPEED
1/4
1/4
2/5
2/5
M
M
12
11
11
10
10
G
G
7ML19985FM01.book Page 11 Wednesday, May 21, 2008 2:17 PM
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