• Allows Inputs to ±256 V or ±100 mA
• 16 mV or 0.8 mA Minimum Input Span
• Red and Green LED Alarm Status Indicators
• Adjustable Deadband
• Provides Relay Contact Closures at Preset DC Input
• Configure Alarms as HI/HI; HI/LO; LO/LO
• Alarms Normal or Reverse Acting
• Configure as Latching Alarm
• Fully Labeled Jumper Positions for Easy Range and Configuration Settings
• Choice of Power Options
• Size, Pinouts and Performance Identical to MM1020
• Permanent Warranty

The FR1020 monitors a DC 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. The configuration of each alarm relay is user-settable as follows:

High or Low - High selects alarm on an increasing signal. Low selects alarm on a decreasing signal.

Normal or Reverse - Normal position selects fail-safe operation (loss of power will result in alarm condition). The relays are energized in the nonalarm condition. When the setpoints are exceeded, the relays de-energize. Selecting the reverse position reverses this logic.

Deadband or Latching – Deadband selects two independently adjustable deadband controls. Deadband for each alarm is adjustable from 0.1% to 100% of the input span. The deadband is symmetrical about the setpoint. With latching selected the alarms will latch when a setpoint is exceeded, and can not be reset unless the input no longer exceeds a setpoint. Reset may be accomplished by remote contact closure or by momentary power interruption. (Several reset inputs may be tied to one reset contact, but note that all negative inputs will be tied together.)

All Wilkerson products are designed with RFI filters and lightning protection to reduce susceptibility to electrical noise and damage by lightning.

INPUTS Limits select any voltage between -256 and +256 VDC select any current between -100 and +100 mA Span (Selectable Ranges) Voltage Current 16-32 mV 32-64 mV 64-128 mV 128-256 mV 256-512 mV .5-1 V 1-2 V 2-4 V 4-8 V 8-16 V 16-32 V 32-64 V 64-128 V 128-256 V 0.8-1.6 mA 1.6-3.2 mA 3.2-6.4 mA 6.4-12.8 mA 12.8-25 mA 25-50 mA 50-100 mA INPUT OFFSET ±0, 25, 50, 75, 100% of F.S. INPUT IMPEDANCE Voltage 1 megohm Current 20 ohms SETPOINT 0 to 100% of span DEADBAND 0.1% to 100% of span

LATCHING ALARM Reset by remote contact closure or by momentary power interruption RELAY CONTACTS Two spdt Resistive Load 5 A max, 150 W max, 240 VAC max, 30 VDC max Inductive Load 1/8 HP max at 120/240 VAC RESPONSE TIME 20 ms typical ACCURACY ±0.1% of span COMMON MODE REJECTION 120 dB, DC to 60 Hz OPERATING TEMPERATURE 14°F to 140°F/-10°C to 60°C TEMPERATURE STABILITY ±(0.02% of span +30 μV)/°C max POWER 115 VAC ±10%, 50 or 60 Hz (2.5 W max) 230 VAC ±10%, 50 or 60 Hz (2.5 W max) 24 VAC ±10%, 50 or 60 Hz (2.5 W max) 115/230 VAC selectable (DC Power Option) 24 VDC (limits 21-32 VDC) (2.5 W max) 12 VDC (limits 10-16 VDC) (2.5 W max) Isolation, DC power supply to input common: 100 megohm

PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 PIN 10 PIN 11

Power AC L1 or DC + Latch Reset Power AC L2 or DC - Input + Input - Relay Set 1 NO Relay Set 1 C Relay Set 1 NC Relay Set 2 NO Relay Set 2 C Relay Set 2 NC