Control Wiring; Motor Thermistors - Danfoss MCD3000 Series Manual

Control wiring

The MCD3000 can be controlled using the local push
buttons, or via remote control inputs. Switch between
the local and remote modes using the
[LOCAL/REMOTE] push button.
The MCD3000 has four remote control inputs.
Contacts used for controlling these inputs should be
low voltage, low current rated (Gold flash or similar).
The Stop and Reset circuits must be closed for
the MCD3000 to run in remote control mode.
Push button control example:
Two wire control example:
ATTENTION
Simultaneously pressing the [STOP] and
[RESET] buttons causes the MCD3000 to
immediately remove voltage from the motor resulting in
a coast to stop. Any soft stop or D.C.Brake settings
are ignored.
Do not apply voltage to the control inputs.
The inputs are active 24 VDC and must
be controlled with potential free circuits.
The Par. Set input determines which of the two
MCD3000 motor parameter sets is operative. When a
start is initiated the MCD3000 checks the state of the
Par. Set input. If there is an open circuit the primary
parameters (Par. 1 - 9) are operative. If there is a
10
MCD3000 Series
closed circuit the secondary parameters (Par. 25 - 33)
are operative.
The MCD3000 provides three relay outputs.
All outputs are programmable. Refer Par. 36, 37 & 38
Relay Function Assignment.

Motor thermistors

If the motor is fitted with thermistors these may be
connected directly to the MCD3000. A trip will occur if
the thermistor circuit resistance is above
approximately 2.8k Ω.
If thermistors are not connected to the MCD3000
there must be a link across the thermistor input
terminals.
MG.15.A2.22 – VLT is a registered Danfoss trademark