Parker OEM750, Руководство пользователя

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OEM750 •
➁
Installation
21
CAUTION
Reverse voltage in excess of 6VDC may damage this device.
With no external current limiting resistor, the current is
controlled by the applied voltage. This is due to a fixed voltage
drop of 1.5VDC on the opto LED and the internal series
resistor (681
Ω)
.
This input allows you to reduce current to a motor from a
remote location. This is accomplished by changing the current
select resistor via the remote input. When the remote input is
enabled, the open collector transistor internally connected to
the
REMOTE
screw terminal will conduct to ground.
To reduce motor current to zero, short the
CURRENT
and
REMOTE
terminals together (with a wire).
You can also reduce motor current by a percentage if you
short
CURRENT
and
REMOTE
with the appropriate resistor
(R
REMOTE
). To calculate R
REMOTE
, first select R
C
, the resistor
associated with your normal operating current (see resistor
selection tables in the
Quick Test ). Next select R
S
, the resistor
in the same section of the table that is associated with your
desired standby current. Then use the following equation to
find R
REMOTE
.
R
REMOTE
= -13,300 (3750 + R
C
) / (R
C
- R
S
)
R
C
= Resistor associated with the operating current
R
S
= Resistor associated with the desired standby current
F
AULT
O
UTPUT
The fault output is an open-collector, open emitter output
from an ILQ2 OPTO isolator. The output transistor will con-
duct when the drive is functioning properly. The transistor
will not conduct when any of the following conditions exist.
• No power is applied to the drive
• There is insufficient voltage (<24VDC)
• The driver detects a motor fault
• The remote input is enabled