LEESON Micro Series Compact Inverters - Manual (Page 73)

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SPD = 0HZ The relay energizes when there is no output to the motor, for any reason, such as: drive
is in STOP mode, drive is in RUN mode but the speed command is 0 Hz, drive is in
SLEEP mode, drive has tripped into a fault, etc .
The open-collector output circuit is a current-sinking type rated at 30 VDC and 40 mA maximum. An
external power supply (30 VDC max.) must be used to power the open-collector outputs. The drive does
not have a dedicated power supply for the open-collector outputs .
53 TB15 OUT (TB-15 OPEN COLLECTOR OUTPUT)
This parameter sets the open-collector output indication for terminal TB-15 . It has the same functionality
as Parameter 52 - TB14OUT above .
54 RELAY (RELAY FUNCTION)
The control board has one set of FORM C relay contacts at TB-16, 17, and 18 that can be programmed
for the same indications as the open-collector outputs described in parameter 52 .
The FORM C contacts at TB-16, 17, and 18 are rated 2 amps at 28 VDC or 120 Vac . Control wiring
diagrams show relays in the rest state (coils NOT energized).
NOTE: Models rated above 60 Hp at 400/480 Vac have a second Form C relay at terminals TB-19, TB-20,
and TB-21 . This relay is controlled by Parameter 52 - TB14 OUT .
55 TB5B LOSS (LOSS OF FOLLOWER ACTION)
This parameter selects the action taken by the drive if the follower signal is lost at TB-5B. This function is
only active if the follower signal is 4-20 mA . The signal is considered lost if it falls below 2 mA .
FAULT The drive will trip into a FOLLOWER fault condition .
SP #4 The drive will go to SPEED #4 (Parameter 4).
NONE The drive will go to the programmed minimum speed .
57 SERIAL (SERIAL COMMUNICATIONS)
This parameter is used to activate serial communications . When using this feature, the drive can
communicate with a personal computer (PC), programmable logic controller (PLC), or other external device
that utilizes RS-485 serial communications for control. The serial interface may be used to read present
parameter settings (uploading to the control device), write new parameter settings (downloading from the
control device), monitor present drive activity, and control current drive activity. The following settings
are available:
DISABLE Serial communication function is disabled .
W / TIMER Enables serial communications with a watchdog timer . If there is not serial activity (read
or write) for more than 10 seconds, serial control will turn off and the drive will stop.
W / O TIMER Enables serial communications without a watchdog timer . However, after 10 seconds
of no serial activity, serial control can be turned off by issuing a STOP command from
any source (keypad, terminal strip) other than the serial link.
NOTE 1: The keypad STOP button is always active, regardless of what method (LOCAL, REMOTE, or
SERIAL) is being used to control the drive. The remote STOP input (TB-1) may also be active, depending
on how the drive is programmed .