MM1720
FREQUENCY INPUT
DUAL LIMIT ALARM
FEATURES
 | Provides Relay Contact Closures at Preset Frequency Input |
| Fail-Safe, Latching, and Adjustable Deadband Available |
| Red and Green LED Alarm Status Indicators |
| Frequency Limit 60 kHz |
| 50 mV to 100 V Peak Input Sensitivity |
| Adjustable Threshold for Low Level Noise Rejection |
| Unlimited* Choice of Input/Output Ranges |
| Input Pullup Resistor Available |
| Choice of Power Options |
| 10 + 5 Year Warranty |
DESCRIPTION
The MM1720 monitors a frequency input signal and provides two sets of spdt, 5 A
alarm relays with two independently adjustable setpoints. Each setpoint has a
set of red/green LEDs to indicate alarm status. When the input is between the
setpoints, the relays are normally de-energized. When the signal exceeds a
particular setpoint, the relays become energized. To provide a fail-safe
operation (loss of power resulting in an alarm state), select Option RR. The
module can be supplied as a HI/HI, HI/LO, or LO/LO alarm (HI/LO supplied if not
specified).
Standard deadband on both alarms is fixed at 0.5% of span (Option A provides
adjustable deadband of 0.5% to 100% of span.) Option D, latching alarms, has no
deadband control. Once the limit has been reached, the alarm latches and power
to the module must be momentarily interrupted to reset the alarm.
The wide range of input sensitivity allows the MM1720 to be driven from low
level magnetic pickups as well as logic level signals. A threshold adjustment
sets the minimum input amplitude the module will process. This allows the user
to trade off sensitivity versus noise rejection. An optional pullup resistor
(Option P) permits use with contact-closure or open-collector inputs.
The module includes filtering and conditioning to reduce susceptibility to
transients and noisy operations.
TYPICAL APPLICATIONS
Flow, speed of motors, conveyors, etc., control HI/LO limit alarm.
MOUNTING
The module is designed to plug into a standard 11-pin relay socket. Part
number MP011 is a plastic socket suitable for mounting on a flat surface or 2
3/4 inch wide PVC snap track (TRK48). Use CLP-1 hold-down clip if
needed. A Killark HK Series explosion-proof housing dome and 11-pin socket
is available (HKB-HK2D-11). A DIN rail mounted socket (P/N DMP011) is
available for 35mm symmetrical rail.
SPECIFICATIONS
INPUT RANGE
select any range from
0 to 10 Hz
min
0 to 60 kHz
max
INPUT SENSITIVITY
any voltage
from 50 mV to 100 V peak
INPUT IMPEDANCE
100 kilohms
OPTION P
Pullup resistor
to + input
10 kilohms
Open-circuit voltage
+12
VDC
SETPOINT
Each alarm
0 to 100% of span
DEADBAND
Standard
Fixed 0.5% of span
(Option
A)
0.5% to 100% of span
ACCURACY
±0.1% of
span or 0.02 ohms,
whichever is
greater
COMMON MODE REJECTION
120 dB, DC to 60
Hz
|
RELAY
CONTACTS
2 (spdt)
Resistive Load:
5 A max, 150 W max
220 VAC max, 30 VDC max
Inductive Load
1/8 HP max at 120/240 VAC
TRANSISTOR OUTPUT (Option V)
Relay driver
(12 V coil, > = 220 ohms)
or open-collector outputs
sink 100 mA, 30 V supply max
LINEARITY (Option
T)
±0.01% of
span
OPERATING
TEMPERATURE
14°F to 140°F
-10°C to 60°C
TEMPERATURE STABILITY
±0.02% of span or
0.025%°C/°C
whichever is greater
POWER
115 VAC 10%, 50/60 Hz
(2.5 W max)
230 VAC 10%, 50/60 Hz
(2.5 W max)
DC Power
Option
24
VDC (limits 21-32 VDC)
Isolation, DC power supply to
input common
10 megohms
* Within specified range limits
|
CONNECTIONS
Power, AC L1 or DC +
Power, AC L2 or DC -
Input +
Input -
Relay 1 NO
Relay 1 C
Relay 1 NC
Relay 2 NO
Relay 2 C
Relay 2 NC |
PINS
1
3
4
5
6
7
8
9
10
11 |
|
