ASD SERIES INSTALLATION AND OPERATION MANUAL
18
CAUTION!
Adjusting the current limit above 160% of the motor nameplate rated current can cause overheating of the motor. Consult the
motor manufacturer. Do not leave the motor in a locked rotor condition for more than a few seconds since motor damage may occur. In order to
ensure that the motor is properly protected with the I
2
t feature, it is required that the CL Trimpot be set for 160% of the motor nameplate rated
current, as described below.
12.8
– BOOST TRIMPOT (BOOST)
The drive is factory set for Fixed Boost (Jumper J6 set to the "FIX" position). When the drive is set for Adjustable
Boost (Jumper J6 set to the "ADJ" position), the BOOST Trimpot can be used to adjust the amount of boost voltage
to the motor. See Figure 32. Also see Section 10.5 on page 16.
Application Note:
The Boost function operates over a frequency range of 0
– 15 Hz. If the frequency range required
is above 15 Hz, Boost adjustment is not necessary.
WARNING!
To avoid motor winding overheating and failure, do not overboost the motor.
Note: An unloaded motor with excessive boost will draw more current than a partially loaded motor.
The boost voltage may be adjusted as follows:
1.
Wire an AC RMS ammeter in series with one motor phase.
2.
Run the motor unloaded at approximately 4 Hz (or 120 RPM).
3.
Increase the boost until the ammeter reaches the motor nameplate rated current (Amps AC).
4.
Using the Main Speed Potentiometer, slowly adjust the motor speed over a 1
– 15 Hz (0 – 450 RPM) range. If the motor current exceeds the
nameplate rating, decrease the boost setting.
13
–
DIAGNOSTIC LEDs
The drive contains two diagnostic LEDs mounted on the enclosure cover to display the drive's operational status.
WARNING!
Do not depend on the PWR LED as a guaranteed power off condition. Be sure the main power switch or circuit breaker is in
the "OFF" position before servicing this drive.
13.1
– POWER ON LED (PWR)
The "PWR" LED will illuminate green when the AC Line is applied to the drive.
13.2
– STATUS LED (ST)
The "ST LED is a tricolor LED which provides indication of a fault or abnormal condition. The information provided can be used to diagnose an
installation problem such as incorrect input voltage, overload condition, and drive output miswiring. It also provides a signal which informs the
user that all drive and microcontroller operating parameters are normal. See Table 5.
14
–
SIGNAL ISOLATOR
The Signal Isolator with Power Supply provides an isolated interface between non-isolated signal sources and the drive. It is used to isolate,
amplify, and condition DC voltage and current signals from any source (tach-generators, transducers, PLCs, and potentiometers). It provides an
isolated input to control motor direction, an isolated 5 Volt DC power supply for potentiometer operation, and an isolated 24 Volt DC power
supply to power transducers or auxiliary equipment. All input connections and power supplies are isolated from the AC line and motor wiring. It
installs easily into the drive with a snap-in mounting base and is wired with a connector.
Main features include voltage or current signal inputs. Other features include power on (PWR) and status indicator (IND) LEDs, barrier terminal
blocks to facilitate wiring, multi-turn trimpots (SCALE, OFFSET), a jumper for voltage or current signal input selection (VOLT, CUR), and a
jumper for signal input type selection (PWM, AN).
FIGURE 32
BOOST
TRIMPOT RANGE
TABLE 5
DRIVE OPERATING CONDITION AND STATUS LED INDICATOR
Drive Operating Condition
Flash Rate
1
and LED Color
Normal Operation
Slow Flash Green
Overload (120%
– 160% Full Load)
Steady Red
2
I
2
t (Drive Timed Out)
Quick Flash Red
2
Short Circuit
Slow Flash Red
Undervoltage
Quick Flash Red / Yellow
3
Overvoltage
Slow Flash Red / Yellow
3
Stop
Steady Yellow
Stand-By
4
Slow Flash Yellow
Input Phase Loss
5
Rapid Flash Yellow
Notes: 1. Slow Flash = 1 second on and 1 second off. Quick Flash = 0.25 second on and 0.25 second off. 2. When the Overload is removed,
before the I
2
t times out and trips the drive, the "ST" LED will flash green. 3. When the Undervoltage or Overvoltage condition is corrected, the
"ST" LED will flash Red / Yellow / Green. 4. Only if the Forward-Stop-Reverse Switch is installed. 5. ASD-29, with three-Phase AC Line input
and ASD-45, 48. Rapid Flash = 4 mSec on and 6 mSec off.
