Siemens MCC-3298 - Manual (Page 14)

12
3 Operating the SAMMS-LV Device
3.4 Output Devices
You can use the following SAMMS-LV output devices:
AC Outputs
The SAMMS-LVX device provides up to three AC coil drivers
capable of driving contactors up to size 6, while SAMMS-LVE
provides one coil driver.
Control Relays
The device provides up to eight software-controlled relays.
These relays are helpful in local two-wire and other applications
requiring maintained contacts.
Timing Relays
The SAMMS-LV device contains four internal software timing
relays. You can configure all four timers as on-delay timers;
however, if needed, you can configure the two adjustable timers
(timing relays TR1 and TR2) as either on-delay or off-delay
timers. Using the Hand Held Communicator, you can program
timing relays TR1 and TR2 from 0 through 200 seconds
(functions F13 and F14). Timing relay TR3 has a fixed 1 second
delay, and timing relay TR4 has a fixed 30 seconds delay. Table
3.1 illustrates the type of timers used on the device and their
ranges.
Timer Type Time (in seconds)
TR1 Programmable on-delay or
off-delay
0 - 200
TR2 Programmable on-delay or
off-delay
0 - 200
TR3 Fixed on-delay 1
TR4 Fixed on-delay 30
Table 3.1 Types of software timing relays
Pilot LEDs
The SAMMS-LVX device contains three light bars on the front
panel, while the SAMMS-LVE contains two light bars. Light bar
L1 is reserved and must be used as the STOP or OFF LED. You
can configure L2 and L3 at your discretion. The Hand, Off and
Auto LEDs correspond to the Hand, Off and Auto pushbuttons
on the front panel as illustrated in Figure 3.4. You can use the
Incomplete Sequence LED in reduced-voltage applications or
to verify contactor operation. Refer to Figure 3.4 for the location
of the LEDs and Table 3.2 for a description of the LED states.
Flashing Pilot LEDs
The front panel contains two or three flashing light bars that
indicate various conditions such as on-delay timing. These
flashing light bars, L1, L2 and L3 as defined above, indicate
different output devices if they are flashing rather than if they are
on constantly. Refer to Figure 3.4 for an illustration of pilot LEDs.
3.5 Input Devices
You can use the following input devices with the SAMMS-LV
device.
Remote AC Inputs
For SAMMS-LVX you can use four 120 VAC or VDC inputs for
remote control, or you can use two inputs for SAMMS-LVE.
Front Panel Pushbuttons
The SAMMS-LV device has six front-panel pushbuttons for
local control of the device. You must use pushbutton 1 (PB1) for
stopping the motor. You must use three of the pushbuttons
(PB4-PB6) for the Hand, Off and Auto functions if these
functions are used in your configuration. If these functions are
not used, you may use PB4-PB6 for other functions. You can
configure the other two pushbuttons (PB2 and PB3) at your
discretion. Refer to Figure 3.4 for assignment of pushbuttons.
Insert labels are used to identify the function associated with
each pushbutton or light bar.
Software Auxiliary Contacts
Any number of internal (software) auxiliary contacts can be
configured. These contacts show either a normally open (NO)
or normally closed (NC) status. You can set up these auxiliary
contacts using the SAMMS-LV software. Through the
SAMMS-LV software, the pilot LEDs also have auxiliary con-
tacts.
STATE
LED On Flashing
Current Unbalance > 40% 20 - 40%
Impending Trip > 110% > 100% - <110%
Overload Trip Trip Start Inhibit
Incomplete
Sequence
Trip
External Trip/Alarm Trip: Loss of Load or
Jam
Alarm: Loss of
Load or Process
Current
CPU Fault Trip: CPU Failure or
Low Voltage
Ground Fault Trip Alarm
Light bar (L1) Stop or Off Off Delay Timer
Timing
Light bar (L2) Start, On, Forward,
Low Speed, Right
On Delay Timer
Timing
Light bar (L3) Reverse, High Speed,
Left
On Delay Timer
Timing
Table 3.2 Description of pilot LEDs
Software Timer Inputs
Each timer has an unlimited number of normally open (NO) and
normally closed (NC) contacts. Timers configured as on-delay
timers have an unlimited supply of normally open timed-closed
(NOTC), and normally closed timed-open (NCTO) contacts.
Timers configured as off-delay timers have an unlimited supply
of normally open timed-open (NOTO), and normally closed
timed-closed (NCTC) contacts.
Communications Inputs
A serial, RS-485 communications port is located on the back of
the device for external communications.
The communications inputs must be included in the ladder logic
(control circuit).