1
Three-phase supply
2
Motor
3
Control voltage (soft starter)
4
Digital inputs
5
Motor thermistor input
6
Relay outputs
7
Analog output
8
Control voltage (external equipment)
9
Pilot lamps
10
Communications/smart card expansion port
K1
Main contactor
F1
Fuses or circuit breaker
RESET,
COM+
(S1)
Reset
START,
COM+
(S2)
Start/stop
DI-A,
COM+
Programmable input A (default = Input trip (N/O))
DI-B,
COM+
Programmable input B (default = Input trip (N/O))
TER-05,
TER-06
Motor thermistor input
13, 14
Main contactor output
21, 22,
23
Relay output A (default = Run)
33, 34
Relay output B (default = Run)
AO-07,
AO-08
Analog output
5.10.2 Externally Bypassed Installation
The soft starter is installed with a main contactor (AC3-rated) and an external bypass contactor. To bypass the soft starter during
run, use an external bypass contactor with an AC1 rating. To bypass the soft starter completely (to allow direct on-line starting if the
soft starter is damaged), use an external bypass contactor with an AC3 rating.
Use the main contactor output (13, 14) to control the main contactor. Use the bypass contactor output (03, 04) to control the exter-
nal bypass.
AQ262141844215en-000401 / 175R1174
44 | Danfoss A/S © 2020.12
Installation
VLT® Soft Starter MCD 600
Operating Guide