6 System integration
Operating manual mzr-2521 and mzr-2921
Last update: June 2019
Technical data subject to change without prior notice!
31
6.5
Operation with the S-ND control unit
The micro annular gear pumps mzr-2521 and mzr-2921 may optionally be
delivered with the S-ND control unit. This programmable control unit enables to
adjust speed for constant flow rates or the position of the motor for the dosage
of constant amounts of liquid. On the delivered diskettes or CDs you will find a
PC-program operating under Windows that enables to program such parameters
as speed, acceleration and current consumption. The delivery package comprises
also a null-modem cable for connection to a serial interface of a PC.
S-ND control unit
Type of control unit
4-Q servo amplifier
Nominal voltage
U
24
V
Power supply
U
B
12 - 30
V
Residual ripple
≤
2 %
Max. continuous output current
I
continuous
230*)
mA
Max. peak output current
I
max
400*)
mA
Speed range
10...6000*)
rpm
Input No. 1
input resistance
5
k
Ω
Nominal analog speed
voltage range
±
10
V
Nominal digital speed
PWM signal
low 0...0.5 / high 4...30
V
frequency range
100...2000
Hz
Output/Input No. 2
Error state
max. U
B
/ 30 mA
no error
switched to GND
programmed as input
low 0...0.5 / high 3,5... U
B
V
Input No. 3, 4, 5
TTL - logic level
low 0...0.5 / high 3,5...30
V
PLC - logic level
low 0...7 / high 12,5...30
V
Program memory
6,6
kBytes
*) Values limited in the control unit with corresponding software
table 15
Technical data of the S-ND control unit
The control unit permits an easy startup of the pump with:
−
the possibility to connect the voltage supply to the delivered DIN socket
−
the possibility to connect the voltage supply with screw clamps
−
a 10-pole connector assembly for the motor cable
−
speed set with potentiometer
−
analog voltage signal 0-10 V for speed control at the screw clamps
−
9-pole connection plug for the RS-232 interface
−
error output with status LED, programmable also as trigger input with screw
connections
−
tumbler switch S1 for the connection of digital input No. 3 of the motor
control unit
−
screw clamps for the connection of digital inputs No. 3, 4, 5 of the motor
control unit