Peter electronic VersiComb II 230-3, Installation And Commissioning Instructions

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6 VC II 230/400-3...15
6. Block diagram
7. Functional description (see connection diagram)
After switching on the operating voltage on L1‘, L2‘ (3, 4 in the case of wide-voltage-range
devices, option „B“), the main contactor interlock on the terminals 11, 12 and the operational
status contact on the terminals 9, 10 as well as the fault signaling contact on the terminals 13, 14
are closed. The motor can be started by pressing the ON-key.
After the start, the motor voltage is changed in two phases (L1 and L3) by a generalized phase
control and power semiconductors. Starting out from an adjustable starting voltage
(potentiometer „M“) the motor voltage is steadily increased. The motor torque rises over the
adjusted acceleration time (potentiometer „t“) according to a ramp function up to the maximum
value. When the starting time is over, the power semiconductors are bypassed by integrated
relays and the motor is directly supplied with power from the mains.
The fully automatic run of the braking interval starts with the switch-off of the motor contactor K1
which thereby closes the contact 5, 6. During braking, the motor contactor is interlocked via the
contact 11, 12. After a delay time which, dependent on the amount of the remanent voltage of the
the motor, optimizes itself, the integrated braking contactor pulls in. Afterwards, an adjustable d.c
voltage is applied to the motor winding. The magnetic field resulting from this has a braking effect
on the still rotating rotor. The d.c. voltage is generated with a thyristor phase control. Special
circuits protect the power semiconductors against overvoltage. With the potentiometer „I“ the
braking torque can be adjusted in wide ranges. Experience shows that a braking current 2.5 times
as high as the rated motor current has a good braking effect.
Approx. 1.5s after a motor standstill has been detected, the integrated standstill detection
(adaptable to the drive via potentiometer „n0“) switches the braking current off.
Fault
signaling
relay
Interlock
Braking
Start
Remanence
standstill
detection
Power
supply
unit
Controller
Trigger
pulse
generation
Relay
card
L1 L2 L3
T1 T2 T3
L1'1 L2'1
Operational
status
3 4
Device supply voltage in the case
of the "wide-voltage range" option
Motor PTC/
Thermal contact
detection
7
8
9
10
13
14
11
12
5
6
1
2