116 • Start Procedure for Medium voltage Motor
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Upon START the voltage and current increase until the current reaches the CURRENT LIMIT value. The
voltage remains at this value until the motor reaches close to nominal speed, where current starts to decrease
and voltage continues to ramp-up to nominal.
13.5.3 Special Starting Using DUAL ADJUSTMENT
Using two starting characteristics, the HRVS-DN will accelerate using standard characteristics (INITIAL
VOLTAGE, ACCELERATION TIME and CURRENT LIMIT). After transition (tx) (IMMEDIATE relay delay),
voltage to input terminal 8 is switched on using the DUAL ADJUSTMENT characteristic to complete
acceleration.
Perform the following steps:
To use DUAL ADJUSTMENT automatically, connect IMMEDIATE in series to input terminal 8 as shown in
section
13.5.3.1 below.
Program IMM./ RELAY TYPE to IMMEDIATE (default setting) and program RELAY ON DELAY to tx.
Program PROG. INPUT #8 to DUAL ADJUSTMENT (default setting).
Program standard parameters and DUAL ADJUSTMENT parameters as shown in the table below.
Using two starting characteristics, the HRVS-DN will accelerate to reach the 200% current limit. After tx
voltage to PROG. INPUT #8 is switched on, using the DUAL ADJUSTMENT characteristic to complete
acceleration.
Parameter Main Setting DUAL ADJUSTMENT Setting
INITIAL VOLTAGE 10% 25%
ACCELERATION TIME t1 = 2-30 sec t2 = 2-30 sec
CURRENT LIMIT 200% 300-400%
RELAY ON DELAY tx = 1-60 sec. -----
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